This bug was fixed in the package crash - 7.2.8-1ubuntu0.19.10.1
---------------
crash (7.2.8-1ubuntu0.19.10.1) eoan; urgency=medium
* Version bump from Focal, based on upstream release 7.2.8 (LP: #1865041):
- Multiple fixes up to kernel 5.5-rc1 (e.g., fixes for kmem/timer/log
commands, for kernels with symbol namespaces and with KASLR enabled).
- Improve handling of /proc/kcore (live memory) for x86_64 kernels with
CONFIG_RANDOMIZE_BASE enabled.
- Fix ARM64 page size handling on kernel 4.4 and before.
- Improve offset gathering and ELF support on KASLR kernels in S390X.
- Support xz compressed vmlinux.
- Fallback to log buffer parsing in case panic task can't be determined
by normal means in the dumpfile.
* Remaining changes:
- Update the maintainer field for Ubuntu.
- If the "live" autopkgtest fails with a recommendation to try
/proc/kcore instead of the default, attempt that before failing
the test. LP: #1858958.
* Fix test, as if will return 0 when no cases were true.
-- gpicc...@canonical.com (Guilherme G. Piccoli) Thu, 27 Feb 2020
11:12:51 -0300
** Changed in: crash (Ubuntu Eoan)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1858958
Title:
fails on arm64 w/ 5.4 kernel: crash: cannot determine VA_BITS_ACTUAL:
please use /proc/kcore
Status in crash package in Ubuntu:
Fix Released
Status in crash source package in Bionic:
Fix Released
Status in crash source package in Eoan:
Fix Released
Bug description:
[impact]
autopkgtest failures
[test case]
crash autopkgtests have began to fail on arm64, as seen here:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-focal/focal/arm64/c/crash/20191223_190616_50c73@/log.gz
The significant difference between this test and the last successful
one is that the host kernel has moved from 5.3 to 5.4. As crash needs
to understand some internals of the kernel memory, it often needs
updates to deal with new kernels.
I've verified that the existing crash still works fine w/ a 5.3
kernel[1], but does not w/ 5.4:
$ sudo crash -st /usr/lib/debug/boot/vmlinux-$(uname -r)
crash: cannot determine VA_BITS_ACTUAL: please use /proc/kcore
However, note hte "please use /proc/kcore" - if I point crash at that
instead of whatever it normally uses (/dev/mem?) it is able to start
[2]. The same is also true w/ current upstream as of commit 7c2d41e
btw - it fails w/o /proc/kcore and works with it.
[1]
ubuntu@d05-3:~$ sudo crash /usr/lib/debug/boot/vmlinux-5.3.0-26-generic
crash 7.2.6
Copyright (C) 2002-2019 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 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, 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) 7.6
Copyright (C) 2013 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"...
KERNEL: /usr/lib/debug/boot/vmlinux-5.3.0-26-generic
DUMPFILE: /proc/kcore
CPUS: 64
DATE: Wed Jan 8 22:32:40 2020
UPTIME: 4 days, 20:46:37
LOAD AVERAGE: 1.09, 0.76, 0.46
TASKS: 836
NODENAME: d05-3
RELEASE: 5.3.0-26-generic
VERSION: #28-Ubuntu SMP Wed Dec 18 05:39:18 UTC 2019
MACHINE: aarch64 (unknown Mhz)
MEMORY: 127.7 GB
PID: 19415
COMMAND: "crash"
TASK: ffff801464623b00 [THREAD_INFO: ffff801464623b00]
CPU: 13
STATE: TASK_RUNNING (ACTIVE)
crash> quit
[2]
ubuntu@d05-3:~$ sudo crash -st /usr/lib/debug/boot/vmlinux-$(uname -r)
/proc/kcore
Thu Jan 9 00:20:20 2020
ubuntu@d05-3:~$ sudo crash /usr/lib/debug/boot/vmlinux-$(uname -r)
/proc/kcore
crash 7.2.6
Copyright (C) 2002-2019 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 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, 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) 7.6
Copyright (C) 2013 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"...
KERNEL: /usr/lib/debug/boot/vmlinux-5.4.0-9-generic
DUMPFILE: /proc/kcore
CPUS: 64
DATE: Thu Jan 9 00:20:57 2020
UPTIME: 03:36:15
LOAD AVERAGE: 0.56, 0.31, 0.26
TASKS: 823
NODENAME: d05-3
RELEASE: 5.4.0-9-generic
VERSION: #12-Ubuntu SMP Mon Dec 16 22:33:31 UTC 2019
MACHINE: aarch64 (unknown Mhz)
MEMORY: 127.7 GB
PID: 44363
COMMAND: "crash"
TASK: ffff00179ae0da00 [THREAD_INFO: ffff00179ae0da00]
CPU: 11
STATE: TASK_RUNNING (ACTIVE)
crash>
[regression potential]
autopkgtest change only; any regression would involve false
positive/negative tests.
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