*** This bug is a duplicate of bug 1838115 ***
https://bugs.launchpad.net/bugs/1838115
Dima, in comment #75 you mentioned that you experienced issues with
Xenial. What kernel version were you running? We believe this issue is
tied to PTI for 32-bit but that feature was only backported to the 4.15
kernel, not the 4.4. kernel.
** No longer affects: linux (Ubuntu Xenial)
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1827884
Title:
x86: mm: early boot problem on i386 with KPTI enabled
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Fix Committed
Bug description:
[Impact]
Commit d653420532d580156c8486686899ea6a9eeb7bf0 in bionic enabled
kernel page table isolation for x86_32, but also introduced
regressions. One of them ("BUG_ON() condition in vmalloc_sync_one()")
has been addressed by bug 1830433, but there are other issues reported
on i386.
Specifically on some i386 systems the kernel seems to fail in the
early stage of boot (black screen and frozen keyboard) with no error
reported on the console.
If the kernel is booted with "mitigations=off" and "nopti" the problem
doesn't happen (that is a clear indication of being a kernel page
table isolation issue).
However, users have been reported positive results with the following
upstream fixes applied (all clean cherry picks), even with mitigations
*and* kernel page table isolation enabled.
[Test Case]
Unfortuantely this problem is not easily reproducible, the kernel
simply fails to boot (black screen and frozen keyboard) after the GRUB
prompt, so we don't have a real test case (except asking the bug
reporters to boot the kernel and see if it works).
[Fix]
The following upstream fix seems to resolve (prevent) the problem:
1d8ca3be86ebc6a38dad8236f45c7a9c61681e78 x86/mm/fault: Allow stack access
below %rsp
aa37c51b9421d66f7931c5fdcb9ce80c450974be x86/mm: Break out user address space
handling
8fed62000039058adfd8b663344e2f448aed1e7a x86/mm: Break out kernel address
space handling
164477c2331be75d9bd57fb76704e676b2bcd1cd x86/mm: Clarify hardware vs.
software "error_code"
0e664eee65337082be49fbbd2ee24aa0d111d0f2 Revert "perf/core: Make sure the
ring-buffer is mapped in all page-tables"
[Regression Potential]
All upstream fixes, tested on the affected platform, backport changes
are minimal.
[Original bug report]
NOTE: Boot problems on TWO different laptops after Software Updater
updated to kernel 4.15.0-48
Both laptops running Ubuntu 18.04.2LTS i386/32bit with Xubuntu
desktop. Both fresh installs from minimal CD in early April,
originally kernel 0.4.15.0-47, both working fine.
Bug report filed on THIS MACHINE:
HP Compag 6710b, Intel Core2 Duo T7100 @ 1.8GHz, RAM 4GB, with Intel
integrated graphics controller GM965/GL960 (with kernel command line parameter
¨video=SVIDEO-1:d¨)
SYMPTOM:
4.15.0-48 requires a second ´recovery´ boot to get it up and running.
Will not boot properly after a normal shutdown - screen goes funny and it
hangs
Does boot successfully after a hard shutdown - detects improper shutdown,
loads grub menu, then boot successfully
Boot problem appeared after update from kernel version 4.15.0-47 to 4.15.0-48
Problem occurs in 4.15.0-48 kernel, but not in 4.15.0-47 (which still boots
normally after a normal shutdown)
OTHER MACHINE:
Even older!!! ASUS W1N Pentium M banias 1.7gHz, 1.5GB RAM, ATI Mobility
Radeon 9600 GPU. Running with command line parameter "forcepae".
SYMPTOM:
Won't boot at all.
Was working fine under 4.15.0-47 as originally installed, until software
updater installed 4.15.0-48. Now it won't boot (hangs, black screen), and I
can't even get into the grub menu to try the older kernel.
More Info on what I've already tried for troubleshooting (on the
HP6710b) is outlined in
https://answers.launchpad.net/ubuntu/+question/680486
Happy to provide more info if needed, but I'm just an end user user
and new to Linux, so will be on a learning curve at this end. (and
apologies in advance if this a user problem, and not an actual bug).
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-48-generic 4.15.0-48.51
ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
Uname: Linux 4.15.0-48-generic i686
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: michael 1681 F.... pulseaudio
CurrentDesktop: XFCE
Date: Mon May 6 21:16:34 2019
MachineType: Hewlett-Packard HP Compaq 6710b
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic
root=UUID=1f4f1f23-b034-4931-af71-c51eba39fbd3 ro video=SVIDEO-1:d
RelatedPackageVersions:
linux-restricted-modules-4.15.0-48-generic N/A
linux-backports-modules-4.15.0-48-generic N/A
linux-firmware 1.173.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/18/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DDU Ver. F.13
dmi.board.name: 30C0
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2E
dmi.chassis.asset.tag: SGH8080272
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr68DDUVer.F.13:bd08/18/2008:svnHewlett-Packard:pnHPCompaq6710b:pvrF.13:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN
dmi.product.name: HP Compaq 6710b
dmi.product.version: F.13
dmi.sys.vendor: Hewlett-Packard
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: michael 1034 F.... pulseaudio
/dev/snd/controlC0: michael 1034 F.... pulseaudio
CurrentDesktop: XFCE
DistroRelease: Ubuntu 18.04
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c00f Logitech, Inc. MouseMan Traveler/Mobile
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: ASUSTeK Computer Inc. W1N
Package: linux (not installed)
PccardctlIdent:
Socket 0:
no product info available
Socket 1:
no product info available
PccardctlStatus:
Socket 0:
no card
Socket 1:
no card
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic
root=UUID=5e6f46b1-73a8-4779-bc20-414a46286723 ro forcepae quiet splash
ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-48-generic N/A
linux-backports-modules-4.15.0-48-generic N/A
linux-firmware 1.173.5
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: bionic
Uname: Linux 4.15.0-48-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/26/2004
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0203
dmi.board.name: W1N
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0203:bd05/26/2004:svnASUSTeKComputerInc.:pnW1N:pvr1.0:rvnASUSTeKComputerInc.:rnW1N:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: W1N
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: michael 1034 F.... pulseaudio
/dev/snd/controlC0: michael 1034 F.... pulseaudio
CurrentDesktop: XFCE
DistroRelease: Ubuntu 18.04
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c00f Logitech, Inc. MouseMan Traveler/Mobile
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: ASUSTeK Computer Inc. W1N
Package: linux (not installed)
PccardctlIdent:
Socket 0:
no product info available
Socket 1:
no product info available
PccardctlStatus:
Socket 0:
no card
Socket 1:
no card
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic
root=UUID=5e6f46b1-73a8-4779-bc20-414a46286723 ro forcepae quiet splash
ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-48-generic N/A
linux-backports-modules-4.15.0-48-generic N/A
linux-firmware 1.173.5
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: bionic
Uname: Linux 4.15.0-48-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/26/2004
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0203
dmi.board.name: W1N
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0203:bd05/26/2004:svnASUSTeKComputerInc.:pnW1N:pvr1.0:rvnASUSTeKComputerInc.:rnW1N:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: W1N
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
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