Plucky on Arm
=============
Before upgrading
----------------
ubuntu@mitchell:~$ uname -a
Linux mitchell 6.14.0-37-generic #37-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14
23:05:04 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@mitchell:~$ dpkg -l | egrep "kexec-tools|kdump-tools|crash|makedumpfile"
ii crash 8.0.6-1ubuntu1
arm64 kernel debugging utility, allowing gdb like syntax
ii kdump-tools 1:1.10.5ubuntu2
arm64 scripts and tools for automating kdump (Linux crash
dumps)
ii kexec-tools 1:2.0.28-0ubuntu3
arm64 tools to support fast kexec reboots
ii makedumpfile 1:1.7.6-1
arm64 VMcore extraction tool
ubuntu@mitchell:~$ crash /usr/lib/debug/boot/vmlinux-6.14.0-37-generic
/var/crash/202512172010/dump.202512172010
crash 8.0.6
Copyright (C) 2002-2025 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, 2020-2024 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 <http://gnu.org/licenses/gpl.html>
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:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
warning: Section .debug_names in
/usr/lib/debug/boot/vmlinux-6.14.0-37-generic length 120268 does not
match section length 369544, ignoring .debug_names.
KERNEL: /usr/lib/debug/boot/vmlinux-6.14.0-37-generic
DUMPFILE: /var/crash/202512172010/dump.202512172010 [PARTIAL DUMP]
CPUS: 224 [OFFLINE: 223]
DATE: Thu Jan 1 00:00:00 UTC 1970
UPTIME: 00:05:27
LOAD AVERAGE: 0.02, 0.15, 0.08
TASKS: 2239
NODENAME: mitchell
RELEASE: 6.14.0-37-generic
VERSION: #37-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14 23:05:04 UTC 2025
MACHINE: aarch64 (unknown Mhz)
MEMORY: 255.9 GB
PANIC: "Kernel panic - not syncing: sysrq triggered crash"
PID: 12005
COMMAND: "tee"
TASK: ffff009f9228a380 [THREAD_INFO: ffff009f9228a380]
CPU: 117
STATE: TASK_RUNNING (PANIC)
crash> bt
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
#0 [ffff8000c8bcb990] machine_kexec at ffff80008006e91c
#1 [ffff8000c8bcbb20] __crash_kexec at ffff80008027f828
#2 [ffff8000c8bcbba0] panic at ffff80008001678c
#3 [ffff8000c8bcbc20] sysrq_handle_crash at ffff800080eaf60c
...
crash> irq
IRQ IRQ_DESC/_DATA IRQACTION NAME
0 (unused) (unused)
1 ffff0008006ec600 ffff0008006f4d80 "IPI"
2 ffff0008006ee000 ffff0008006f4e80 "IPI"
3 ffff0008006eb400 ffff0008006f4580 "IPI"
mount, vm, and files command fails
crash> vm
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
MM PGD RSS TOTAL_VM
ffff009fa56be900 ffff009f9c4bd000 1880k 5748k
VMA START END FLAGS FILE
vm: invalid structure member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
[/usr/bin/crash] error trace: b4b3fe37df5c => b4b3fe37d3ac =>
b4b3fe3b2394 => b4b3fe46448c
vm: invalid structure member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
crash> files
files: invalid structure member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
[/usr/bin/crash] error trace: b4b3fe3bc854 => b4b3fe3bbff4 => b4b3fe3b2394 =>
b4b3fe46448c
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
files: invalid structure member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
crash> mount
mount: invalid structure member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
[/usr/bin/crash] error trace: b4b3fe3bb168 => b4b3fe3ba218 => b4b3fe3b2394 =>
b4b3fe46448c
MOUNT SUPERBLK TYPE DEVNAME DIRNAME
ffff00080160f300 ffff00080164e000 rootfs rootfs mount: invalid structure
member offset: dentry_d_iname
FILE: filesys.c LINE: 3243 FUNCTION: get_pathname_component()
Upgrading to -proposed
----------------------
ubuntu@mitchell:~$ sudo apt install crash=8.0.6-1ubuntu1.25.04.1
ubuntu@mitchell:~$ dpkg -l | egrep "kexec-tools|kdump-tools|crash|makedumpfile"
ii crash 8.0.6-1ubuntu1.25.04.1
arm64 kernel debugging utility, allowing gdb like syntax
ii kdump-tools 1:1.10.5ubuntu2
arm64 scripts and tools for automating kdump (Linux crash
dumps)
ii kexec-tools 1:2.0.28-0ubuntu3
arm64 tools to support fast kexec reboots
ii makedumpfile 1:1.7.6-1
arm64 VMcore extraction tool
Open the same dump
ubuntu@mitchell:~$ crash /usr/lib/debug/boot/vmlinux-6.14.0-37-generic
/var/crash/202512172010/dump.202512172010
crash 8.0.6
Copyright (C) 2002-2025 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, 2020-2024 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 <http://gnu.org/licenses/gpl.html>
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:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
warning: Section .debug_names in
/usr/lib/debug/boot/vmlinux-6.14.0-37-generic length 120268 does not
match section length 369544, ignoring .debug_names.
KERNEL: /usr/lib/debug/boot/vmlinux-6.14.0-37-generic
DUMPFILE: /var/crash/202512172010/dump.202512172010 [PARTIAL DUMP]
CPUS: 224 [OFFLINE: 223]
DATE: Thu Jan 1 00:00:00 UTC 1970
UPTIME: 00:05:27
LOAD AVERAGE: 0.02, 0.15, 0.08
TASKS: 2239
NODENAME: mitchell
RELEASE: 6.14.0-37-generic
VERSION: #37-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14 23:05:04 UTC 2025
MACHINE: aarch64 (unknown Mhz)
MEMORY: 255.9 GB
PANIC: "Kernel panic - not syncing: sysrq triggered crash"
PID: 12005
COMMAND: "tee"
TASK: ffff009f9228a380 [THREAD_INFO: ffff009f9228a380]
CPU: 117
STATE: TASK_RUNNING (PANIC)
crash> bt
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
#0 [ffff8000c8bcb990] machine_kexec at ffff80008006e91c
#1 [ffff8000c8bcbb20] __crash_kexec at ffff80008027f828
#2 [ffff8000c8bcbba0] panic at ffff80008001678c
#3 [ffff8000c8bcbc20] sysrq_handle_crash at ffff800080eaf60c
crash> files
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
ROOT: / CWD: /home/ubuntu
FD FILE DENTRY INODE TYPE PATH
0 ffff009f88b1f080 ffff009f9504d2c0 ffff009f8a10b650 FIFO
1 ffff009f892d4d80 ffff009f950f2e40 ffff009f9eaf53f0 CHR /dev/pts/1
2 ffff009f892d4d80 ffff009f950f2e40 ffff009f9eaf53f0 CHR /dev/pts/1
3 ffff009f893500c0 ffff009f9504dbc0 ffff009f8a11e608 REG /proc/sysrq-trigger
crash> vm
PID: 12005 TASK: ffff009f9228a380 CPU: 117 COMMAND: "tee"
MM PGD RSS TOTAL_VM
ffff009fa56be900 ffff009f9c4bd000 1880k 5748k
VMA START END FLAGS FILE
ffff009fb26a7420 c10d403b0000 c10d403b8000 75 /usr/bin/tee
ffff009fb26a6228 c10d403cf000 c10d403d0000 100071 /usr/bin/tee
ffff009fb26a74d8 c10d403d0000 c10d403d1000 100073 /usr/bin/tee
...
crash> mount
MOUNT SUPERBLK TYPE DEVNAME DIRNAME
ffff00080160f300 ffff00080164e000 rootfs rootfs /
ffff00081d46d200 ffff00081d458800 sysfs sysfs /sys
ffff00081d3f8600 ffff00082056f000 proc proc /proc
...
mount, files, and vm commands now work
The -proposed crash can open dumps generated by the Plucky makedumpfile
on the 6.14 kernel on arm
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2125145
Title:
[SRU] Makedumpfile: Errors and Page Exclusions When Opening Kernel
Crashdump Files Generated on the Latest HWE Kernel
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