subject:"\[Kernel\-packages\] \[Bug 2038248\] Re\: Slab page exclusion issue on Linux 6.2\-rc1"

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-11-20 Thread Launchpad Bug Tracker

This bug was fixed in the package makedumpfile - 1:1.7.0-1ubuntu0.1

---
makedumpfile (1:1.7.0-1ubuntu0.1) jammy; urgency=medium

  * d/p/lp2038248-fix-wrong-exclusion-of-slab-pages-on-Linux-6.2.patch:
When using the "makedumpfile -d 8" command,
exclude user data rather than other slab pages (LP: #2038248)

 -- Chengen Du   Tue, 10 Oct 2023 13:52:06
+

** Changed in: makedumpfile (Ubuntu Jammy)
   Status: Fix Committed => Fix Released

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Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Released
Status in makedumpfile source package in Lunar:
  Fix Released

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-11-20 Thread Launchpad Bug Tracker

This bug was fixed in the package makedumpfile - 1:1.7.2-1ubuntu0.1

---
makedumpfile (1:1.7.2-1ubuntu0.1) lunar; urgency=medium

  * d/p/lp2038248-fix-wrong-exclusion-of-slab-pages-on-Linux-6.2.patch:
When using the "makedumpfile -d 8" command,
exclude user data rather than other slab pages (LP: #2038248)

 -- Chengen Du   Tue, 03 Oct 2023 06:26:06
+

** Changed in: makedumpfile (Ubuntu Lunar)
   Status: Fix Committed => Fix Released

-- 
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Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Released
Status in makedumpfile source package in Lunar:
  Fix Released

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-27 Thread Chengen Du

Hi Andreas,

I apologize for the lack of detail.
The 5.15 GA kernel for Jammy has already passed testing. Please see the test 
results below.
==
# uname -a
Linux ubuntu 5.15.0-87-generic #97-Ubuntu SMP Tue Oct 3 09:52:42 UTC 2023 
aarch64 aarch64 aarch64 GNU/Linux
# apt-cache policy makedumpfile
makedumpfile:
  Installed: 1:1.7.0-1ubuntu0.1
  Candidate: 1:1.7.0-1ubuntu0.1
  Version table:
 *** 1:1.7.0-1ubuntu0.1 500
500 http://ports.ubuntu.com/ubuntu-ports jammy-proposed/main arm64 
Packages
100 /var/lib/dpkg/status
 1:1.7.0-1build1 500
500 http://ports.ubuntu.com/ubuntu-ports jammy/main arm64 Packages
# crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
202310270330/dump.202310270330
crash 8.0.0
Copyright (C) 2002-2021  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011, 2020-2021  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
Copyright (C) 2015, 2021  VMware, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.  Enter "help copying" to see the conditions.
This program has absolutely no warranty.  Enter "help warranty" for details.
 
GNU gdb (GDB) 10.2 
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "aarch64-unknown-linux-gnu".
Type "show configuration" for configuration details.
Find the GDB manual and other documentation resources online at:
.

For help, type "help".
Type "apropos word" to search for commands related to "word"...

  KERNEL: 
dbgsym-5.15.0-87-generic/usr/lib/debug/boot/vmlinux-5.15.0-87-generic
DUMPFILE: 202310270330/dump.202310270330  [PARTIAL DUMP]
CPUS: 8
DATE: Fri Oct 27 03:30:26 UTC 2023
  UPTIME: 2135039823346 days, 00:14:59
LOAD AVERAGE: 0.91, 0.45, 0.17
   TASKS: 215
NODENAME: ubuntu
 RELEASE: 5.15.0-87-generic
 VERSION: #97-Ubuntu SMP Tue Oct 3 09:52:42 UTC 2023
 MACHINE: aarch64  (unknown Mhz)
  MEMORY: 8 GB
   PANIC: "Kernel panic - not syncing: sysrq triggered crash"
 PID: 1199
 COMMAND: "bash"
TASK: c6459040  [THREAD_INFO: c6459040]
 CPU: 4
   STATE: TASK_RUNNING (PANIC)

crash> 
==

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https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Committed
Status in makedumpfile source package in Lunar:
  Fix Committed

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-26 Thread Andreas Hasenack

Hi Chengen, or someone else:

could you please clarify that you also performed the test with the 5.15
GA kernel for Jammy, not just 6.2, which is what I assume you did?

I see that @mfo tested with 5.15 in comment #7, but that was before the
package landed in jammy-proposed.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Committed
Status in makedumpfile source package in Lunar:
  Fix Committed

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-17 Thread Chengen Du

The package in -proposed has been successfully tested:
1:1.7.0-1ubuntu0.1 in Jammy, 1:1.7.2-1ubuntu0.1 in Lunar

** Tags removed: verification-needed verification-needed-jammy 
verification-needed-lunar
** Tags added: verification-done verification-done-jammy verification-done-lunar

-- 
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Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Committed
Status in makedumpfile source package in Lunar:
  Fix Committed

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-13 Thread Timo Aaltonen

Hello Chengen, or anyone else affected,

Accepted makedumpfile into lunar-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/makedumpfile/1:1.7.2-1ubuntu0.1 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
lunar to verification-done-lunar. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-lunar. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: makedumpfile (Ubuntu Lunar)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-lunar

** Changed in: makedumpfile (Ubuntu Jammy)
   Status: In Progress => Fix Committed

** Tags added: verification-needed-jammy

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https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Fix Committed
Status in makedumpfile source package in Lunar:
  Fix Committed

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash"

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-10 Thread Mauricio Faria de Oliveira

Uploaded to Jammy too.

The SRU template is now updated to reflect that.

Packages verified with LXD VM and upstream crash for the 6.2 kernel for now 
(before bug 2038248) and Ubuntu crash for the 5.15 GA kernel. All good!
(Details in comment #7.)

The package built correctly in a PPA on all architectures.


** Changed in: makedumpfile (Ubuntu Jammy)
   Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  In Progress
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]

  The kernel crashdumps generated by makedumpfile on kernel 6.2
  (affects Lunar, and Jammy with the HWE kernel) might not open
  on crash, due to kernel changes not reflected in makedumpfile.

  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]

  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]

  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot

  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
     /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd:
     /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz

  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  ...
  please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]

  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-10 Thread Mauricio Faria de Oliveira

** Description changed:

  [Impact]
+ 
+ The kernel crashdumps generated by makedumpfile on kernel 6.2
+ (affects Lunar, and Jammy with the HWE kernel) might not open
+ on crash, due to kernel changes not reflected in makedumpfile.
+ 
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:
  
  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"
  
  [Fix]
+ 
  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900
  
- [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
+ [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==
  
  [Test Plan]
+ 
  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot
+ 
  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
-/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
- kdump initrd: 
-/var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
+    /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
+ kdump initrd:
+    /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump
  
  kexec command:
-   /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
+   /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
+ 
  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
- crash 8.0.3++
- Copyright (C) 2002-2022  Red Hat, Inc.
- Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
- Copyright (C) 1999-2006  Hewlett-Packard Co
- Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
- Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
- Copyright (C) 2005, 2011, 2020-2022  NEC Corporation
- Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
- Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
- Copyright (C) 2015, 2021  VMware, Inc.
- This program is free software, covered by the GNU General Public License,
- and you are welcome to change it and/or distribute copies of it under
- certain conditions.  Enter "help copying" to see the conditions.
- This program has absolutely no warranty.  Enter "help warranty" for details.
-  
- GNU gdb (GDB) 10.2 
- Copyright (C) 2021 Free Software Foundation, Inc.
- License GPLv3+: GNU GPL version 3 or later 
- This is free software: you are free to change and redistribute it.
- There is NO WARRANTY, to the extent permitted by law.
- Type "show copying" and "show warranty" for details.
- This GDB was configured as "aarch64-unknown-linux-gnu".
- Type "show configuration" for configuration details.
- Find the GDB manual and other documentation resources online at:
- .
- 
- For help, type "help".
- Type "apropos word" to search for commands related to "word"...
- 
- please wait... (gathering task table data)  
+ ...
+ please wait... (gathering task table data)
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"
  
  [Where problems could occur]
+ 
  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-10 Thread Mauricio Faria de Oliveira

Jammy is also affected for the 6.2 HWE kernel.

The patch for makedumpfile is the same, and applies cleanly.
It fixes the issue with the 6.2 HWE kernel, and causes no regression with the 
5.15 GA kernel (ie, the dump file can still be opened in crash).


Details:
---

Setup:

$ lxc launch --vm --config limits.memory=2GiB ubuntu:jammy mdf-j
$ lxc shell mdf-j

# apt update && apt install -y linux-image-generic-hwe-22.04 
linux-crashdump crash
# apt remove -y $(dpkg -l | awk '$2 ~ /linux-.*kvm/ { print $2 }')

# sed 's/crashkernel=[^ "]\+/crashkernel=512M/' -i 
/etc/default/grub.d/kdump-tools.cfg
# update-grub
# reboot
# kdump-config show | grep state:
current state:ready to kdump
# echo c >/proc/sysrq-trigger

Debug symbols:

# wget 
https://launchpad.net/ubuntu/+archive/primary/+files/linux-image-unsigned-6.2.0-34-generic-dbgsym_6.2.0-34.34~22.04.1_amd64.ddeb
# ar x 
linux-image-unsigned-6.2.0-34-generic-dbgsym_6.2.0-34.34~22.04.1_amd64.ddeb 
data.tar.xz
# tar xvf data.tar.xz ./usr/lib/debug/boot/vmlinux-6.2.0-34-generic
./usr/lib/debug/boot/vmlinux-6.2.0-34-generic

Upstream crash (for now):

# apt build-dep -y crash
# git clone https://github.com/crash-utility/crash.git
# cd crash
# make

Original package:
---

# ./crash ./usr/lib/debug/boot/vmlinux-6.2.0-34-generic 
/var/crash/202310101134/dump.202310101134
...
please wait... (gathering task table data)
crash: page excluded: kernel virtual address: 9b13c2b826c8  type: 
"xa_node shift"

Patched package:
---

$ ./crash ./usr/lib/debug/boot/vmlinux-6.2.0-34-generic 
/var/crash/202310101206/dump.202310101206
...
 RELEASE: 6.2.0-34-generic
 VERSION: #34~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Sep  7 
13:12:03 UTC 2
...
crash>

Patched package & GA kernel:
---

(upstream crash and Ubuntu crash, both work)

$ ./crash ./usr/lib/debug/boot/vmlinux-5.15.0-86-generic 
/var/crash/202310101225/dump.202310101225
...
 RELEASE: 5.15.0-86-generic
 VERSION: #96-Ubuntu SMP Wed Sep 20 08:23:49 UTC 2023
...
crash>

$ crash ./usr/lib/debug/boot/vmlinux-5.15.0-86-generic 
/var/crash/202310101225/dump.202310101225
...
 RELEASE: 5.15.0-86-generic
 VERSION: #96-Ubuntu SMP Wed Sep 20 08:23:49 UTC 2023
...
crash>


** Changed in: makedumpfile (Ubuntu Jammy)
   Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Confirmed
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]
  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]
  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot
  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
 /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd: 
 /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-07 Thread Mauricio Faria de Oliveira

(The package built correctly in a PPA on all architectures.)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Incomplete
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]
  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]
  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot
  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
 /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd: 
 /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  crash 8.0.3++
  Copyright (C) 2002-2022  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011, 2020-2022  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  Copyright (C) 2015, 2021  VMware, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.
   
  GNU gdb (GDB) 10.2 
  Copyright (C) 2021 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  Type "show copying" and "show warranty" for details.
  This GDB was configured as "aarch64-unknown-linux-gnu".
  Type "show configuration" for configuration details.
  Find the GDB manual and other documentation resources online at:
  .

  For help, type "help".
  Type "apropos word" to search for commands related to "word"...

  please wait... (gathering task table data)  
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]
  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.
  However, it's crucial to note that this change may impact the content of the 
dump file, potentially leading to a situation where the "crash" utility is 
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions


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Mailing list:

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-07 Thread Mauricio Faria de Oliveira

Hi Chengen,

The fix is included in 1.7.3 in mantic, so only lunar needs the fix.

We probably would like jammy as well, for compatibility with the 6.2+
HWE kernel (without regression to the 5.15 GA kernel).

Could you please check jammy for that too? (I'll add a task as
Incomplete.)

$ git describe --contains 5f17bdd2128998a3eeeb4521d136a19fadb6
1.7.3~6

$ rmadison -a source makedumpfile
 makedumpfile | 1.5.5-2ubuntu1   | trusty   | source
 makedumpfile | 1.5.5-2ubuntu1.6 | trusty-updates   | source
 makedumpfile | 1:1.5.9-5~ubuntu14.04.1  | trusty-backports | source
 makedumpfile | 1:1.5.9-5| xenial   | source
 makedumpfile | 1:1.6.3-2~16.04.3| xenial-updates   | source
 makedumpfile | 1:1.6.3-2| bionic   | source
 makedumpfile | 1:1.6.5-1ubuntu1~18.04.7 | bionic-updates   | source
 makedumpfile | 1:1.6.7-1ubuntu2 | focal| source
 makedumpfile | 1:1.6.7-1ubuntu2.4   | focal-updates| source
 makedumpfile | 1:1.7.0-1build1  | jammy| source
 makedumpfile | 1:1.7.2-1| lunar| source
 makedumpfile | 1:1.7.3-1| mantic   | source

Packages verified with LXD VM and upstream crash for now (before bug
2038248). All good!

Uploaded to Lunar.

Thanks!

Details:
---

Setup:

$ lxc launch --vm --config limits.memory=2GiB ubuntu:lunar mdf-l
$ lxc shell mdf-l

# apt update && apt install -y linux-image-generic linux-crashdump crash
# apt remove -y $(dpkg -l | awk '$2 ~ /linux-.*kvm/ { print $2 }')

# sed 's/crashkernel=[^ "]\+/crashkernel=512M/' -i 
/etc/default/grub.d/kdump-tools.cfg
# update-grub
# reboot
# kdump-config show | grep state:
current state:ready to kdump
# echo c >/proc/sysrq-trigger

Debug symbols:

# wget 
https://launchpad.net/ubuntu/+archive/primary/+files/linux-image-unsigned-6.2.0-34-generic-dbgsym_6.2.0-34.34_amd64.ddeb
# ar x 
linux-image-unsigned-6.2.0-34-generic-dbgsym_6.2.0-34.34_amd64.ddeb data.tar.xz
# tar xvf data.tar.xz ./usr/lib/debug/boot/vmlinux-6.2.0-34-generic
./usr/lib/debug/boot/vmlinux-6.2.0-34-generic

Upstream crash (for now):

# apt build-dep -y crash
# git clone https://github.com/crash-utility/crash.git
# cd crash
# make

Original package:
---

# ./crash /var/crash/202310072357/dump.202310072357 
./usr/lib/debug/boot/vmlinux-6.2.0-34-generic
...
please wait... (gathering task table data)
crash: page excluded: kernel virtual address: 9b13c2b826c8  type: 
"xa_node shift"

Patched package:
---

# wget 
https://launchpad.net/~mfo/+archive/ubuntu/test/+build/26759821/+files/makedumpfile_1.7.2-1ubuntu0.1_amd64.deb
# apt install ./makedumpfile_1.7.2-1ubuntu0.1_amd64.deb

# kdump-config reload
# kdump-config show | grep state:
current state:ready to kdump
# echo c >/proc/sysrq-trigger

# ./crash /var/crash/202310080054/dump.202310080054 
./usr/lib/debug/boot/vmlinux-6.2.0-34-generic
...
  KERNEL: ./usr/lib/debug/boot/vmlinux-6.2.0-34-generic
DUMPFILE: /var/crash/202310080054/dump.202310080054  [PARTIAL DUMP]
...
crash>


** Also affects: makedumpfile (Ubuntu Jammy)
   Importance: Undecided
   Status: New

** Changed in: makedumpfile (Ubuntu Jammy)
   Status: New => Incomplete

** Changed in: makedumpfile (Ubuntu Jammy)
 Assignee: (unassigned) => Chengen Du (chengendu)

** Changed in: makedumpfile (Ubuntu Lunar)
   Importance: Undecided => Medium

** Changed in: makedumpfile (Ubuntu Jammy)
   Importance: Undecided => Medium

** Changed in: makedumpfile (Ubuntu)
   Status: New => Fix Released

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Jammy:
  Incomplete
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-07 Thread Mauricio Faria de Oliveira

** Patch added: "lp2038248-makedumpfile-lunar-v2.debdiff"

https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+attachment/5707762/+files/lp2038248-makedumpfile-lunar-v2.debdiff

--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
New
Status in makedumpfile source package in Lunar:
In Progress

Bug description:
[Impact]
The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions,
introduced a change that aligns the offset of slab.slabs with that of
page.mapping.
However, this modification unintentionally causes the makedumpfile command
with the -d 8 option, meant to exclude user data, to incorrectly exclude
certain slab pages.
Consequently, when utilizing dumpfiles generated in this manner, the "crash"
utility may encounter an error when attempting to initiate a session:

crash: page excluded: kernel virtual address: e269d428 type:
"xa_node shift"

[Fix]
An upstream fix is available.
==
commit 5f17bdd2128998a3eeeb4521d136a19fadb6
Author: Kazuhito Hagio
Date: Wed Dec 21 11:06:39 2022 +0900

[PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
==

[Test Plan]
1. Install the required packages and then proceed to reboot the machine.
# sudo apt install crash linux-crashdump -y
# reboot
2. To check the status of kdump, use the `kdump-config show` command.
# kdump-config show
DUMP_MODE:kdump
USE_KDUMP:1
KDUMP_COREDIR:/var/crash
crashkernel addr: 0x6400
/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
kdump initrd:
/var/lib/kdump/initrd.img: symbolic link to
/var/lib/kdump/initrd.img-6.2.0-33-generic
current state:ready to kdump

kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
3. To trigger a crash dump forcefully, execute the `echo c | sudo tee
/proc/sysrq-trigger` command.
4. Download the kernel .ddeb file, which will be used for analyzing the dump
file.
# sudo -i
# cd /var/crash
# pull-lp-ddebs linux-image-unsigned-$(uname -r)
# dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
5. Utilize the "crash" utility to parse and analyze the dump file.
# crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r)
/dump.
crash 8.0.3++
Copyright (C) 2002-2022 Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation
Copyright (C) 1999-2006 Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited
Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011, 2020-2022 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
Copyright (C) 2015, 2021 VMware, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter "help copying" to see the conditions.
This program has absolutely no warranty. Enter "help warranty" for details.

GNU gdb (GDB) 10.2
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "aarch64-unknown-linux-gnu".
Type "show configuration" for configuration details.
Find the GDB manual and other documentation resources online at:
.

For help, type "help".
Type "apropos word" to search for commands related to "word"...

please wait... (gathering task table data)
crash: page excluded: kernel virtual address: e269d428 type:
"xa_node shift"

[Where problems could occur]
The patch has altered the method for excluding slab pages, aligning with the
structural changes introduced in Linux 6.2-rc1.
This modification is essential for Linux kernel 6.2.
However, it's crucial to note that this change may impact the content of the
dump file, potentially leading to a situation where the "crash" utility is
unable to parse it in the worst-case scenario.

To manage notifications about this bug go to:

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-07 Thread Mauricio Faria de Oliveira

Hi Chengen,

Thanks for the detailed SRU template and debdiff!

I have only 2 minor fixes, which I already performed:
- Version: s/ubuntu1/ubuntu0.1/ (see doc [1])
- Maintainer: this is the first 'ubuntu' version, so run `update-maintainer` 
(see `debian/control` hunk).

The updated debdiff is attached for reference,
and I'll continue the work on sponsoring this.

cheers

[1]
https://wiki.ubuntu.com/SecurityTeam/UpdatePreparation#Update_the_packaging

** Tags added: se-sponsor-mfo

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  New
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]
  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]
  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot
  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
 /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd: 
 /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  crash 8.0.3++
  Copyright (C) 2002-2022  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011, 2020-2022  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  Copyright (C) 2015, 2021  VMware, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.
   
  GNU gdb (GDB) 10.2 
  Copyright (C) 2021 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  Type "show copying" and "show warranty" for details.
  This GDB was configured as "aarch64-unknown-linux-gnu".
  Type "show configuration" for configuration details.
  Find the GDB manual and other documentation resources online at:
  .

  For help, type "help".
  Type "apropos word" to search for commands related to "word"...

  please wait... (gathering task table data)  
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]
  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification is essential for Linux kernel 6.2.

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-03 Thread Ubuntu Foundations Team Bug Bot

The attachment "lp2038248-makedumpfile-lunar.debdiff" seems to be a
debdiff.  The ubuntu-sponsors team has been subscribed to the bug report
so that they can review and hopefully sponsor the debdiff.  If the
attachment isn't a patch, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are member of the
~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
  Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
  New
Status in makedumpfile source package in Lunar:
  In Progress

Bug description:
  [Impact]
  The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to 
allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, 
introduced a change that aligns the offset of slab.slabs with that of 
page.mapping.
  However, this modification unintentionally causes the makedumpfile command 
with the -d 8 option, meant to exclude user data, to incorrectly exclude 
certain slab pages.
  Consequently, when utilizing dumpfiles generated in this manner, the "crash" 
utility may encounter an error when attempting to initiate a session:

  crash: page excluded: kernel virtual address: e269d428  type:
  "xa_node shift"

  [Fix]
  An upstream fix is available.
  ==
  commit 5f17bdd2128998a3eeeb4521d136a19fadb6
  Author: Kazuhito Hagio 
  Date:   Wed Dec 21 11:06:39 2022 +0900

  [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
  ==

  [Test Plan]
  1. Install the required packages and then proceed to reboot the machine.
  # sudo apt install crash linux-crashdump -y
  # reboot
  2. To check the status of kdump, use the `kdump-config show` command.
  # kdump-config show
  DUMP_MODE:kdump
  USE_KDUMP:1
  KDUMP_COREDIR:/var/crash
  crashkernel addr: 0x6400
 /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic
  kdump initrd: 
 /var/lib/kdump/initrd.img: symbolic link to 
/var/lib/kdump/initrd.img-6.2.0-33-generic
  current state:ready to kdump

  kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic 
root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 
reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll 
usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
  3. To trigger a crash dump forcefully, execute the `echo c | sudo tee 
/proc/sysrq-trigger` command.
  4. Download the kernel .ddeb file, which will be used for analyzing the dump 
file.
  # sudo -i
  # cd /var/crash
  # pull-lp-ddebs linux-image-unsigned-$(uname -r)
  # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r)
  5. Utilize the "crash" utility to parse and analyze the dump file.
  # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) 
/dump.
  crash 8.0.3++
  Copyright (C) 2002-2022  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011, 2020-2022  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  Copyright (C) 2015, 2021  VMware, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.
   
  GNU gdb (GDB) 10.2 
  Copyright (C) 2021 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  Type "show copying" and "show warranty" for details.
  This GDB was configured as "aarch64-unknown-linux-gnu".
  Type "show configuration" for configuration details.
  Find the GDB manual and other documentation resources online at:
  .

  For help, type "help".
  Type "apropos word" to search for commands related to "word"...

  please wait... (gathering task table data)  
  crash: page excluded: kernel virtual address: e269d428  type: 
"xa_node shift"

  [Where problems could occur]
  The patch has altered the method for excluding slab pages, aligning with the 
structural changes introduced in Linux 6.2-rc1.
  This modification

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

2023-10-03 Thread Chengen Du

debdiff for Lunar

** Patch added: "lp2038248-makedumpfile-lunar.debdiff"

https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+attachment/5706208/+files/lp2038248-makedumpfile-lunar.debdiff

--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to makedumpfile in Ubuntu.
https://bugs.launchpad.net/bugs/2038248

Title:
Slab page exclusion issue on Linux 6.2-rc1

Status in makedumpfile package in Ubuntu:
New
Status in makedumpfile source package in Lunar:
In Progress

crash: page excluded: kernel virtual address: e269d428 type:
"xa_node shift"

[Fix]
An upstream fix is available.
==
commit 5f17bdd2128998a3eeeb4521d136a19fadb6
Author: Kazuhito Hagio
Date: Wed Dec 21 11:06:39 2022 +0900

[PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1
==

For help, type "help".
Type "apropos word" to search for commands related to "word"...

please wait... (gathering task table data)
crash: page excluded: kernel virtual address: e269d428 type:
"xa_node shift"

To manage notifications about this bug go to:

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

[Kernel-packages] [Bug 2038248] Re: Slab page exclusion issue on Linux 6.2-rc1

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