Your message dated Thu, 27 Feb 2020 21:48:40 +0100 (CET)
with message-id
<[email protected]>
and subject line Re: Bug#952659: crash: cannot match kernel with kaslr enabled
has caused the Debian Bug report #952659,
regarding crash: cannot match kernel with kaslr enabled
to be marked as done.
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--
952659: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952659
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: crash
Version: 7.2.5-1
Severity: grave
Justification: renders package unusable
Dear Maintainer,
I set up a fresh Debian 10 install on my i686 machine today.
I installed 'kdump-tools' and 'crash'
I added 'kernel.softlockup_panic=1' and 'kernel.hardlockup_panic=1' to
/etc/sysctl.conf
I rebooted so kdump-tools would add the 'crashkernel=384M-:128M'
argument to my kernel command line
I then triggered a crash by running 'sysctl kernel.sysrq=1 && echo c >
/proc/sysrq-trigger'
It saved a crash to '/var/crash/202002270816/dump.202002270816'
I installed 'linux-image-4.19.0-8-686-pae-dbg'
I ran 'crash /usr/lib/debug/vmlinux-4.19.0-8-686-pae
/var/crash/202002270816/dump.202002270816'
The following output happened:
---- CUT HERE ----
crash 7.2.5
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 "i686-pc-linux-gnu"...
crash: page excluded: kernel virtual address: c1948564 type: "possible"
WARNING: cannot read cpu_possible_map
crash: page excluded: kernel virtual address: c194855c type: "present"
WARNING: cannot read cpu_present_map
crash: page excluded: kernel virtual address: c1948560 type: "online"
WARNING: cannot read cpu_online_map
crash: page excluded: kernel virtual address: c1948558 type: "active"
WARNING: cannot read cpu_active_map
crash: page excluded: kernel virtual address: c18bb79c type: "pv_init_ops"
crash: page excluded: kernel virtual address: c1a82268 type:
"shadow_timekeeper xtime_sec"
crash: page excluded: kernel virtual address: c18af1c4 type: "init_uts_ns"
crash: /usr/lib/debug/boot/vmlinux-4.19.0-8-686-pae and
/var/crash/202002270816/dump.202002270816 do not match!
Usage:
crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS] (dumpfile form)
crash [OPTION]... [NAMELIST] (live system form)
Enter "crash -h" for details.
---- CUT HERE ----
I spent a while trying to figure out what was going on, but eventually I
found that booting with the 'nokaslr' argument fixes this issue.
-- System Information:
Debian Release: 10.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 4.19.0-8-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8),
LANGUAGE=en_AU:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages crash depends on:
ii binutils 2.31.1-16
ii libc6 2.28-10
ii liblzo2-2 2.10-0.1
ii libncurses6 6.1+20181013-2+deb10u2
ii libsnappy1v5 1.1.7-1
ii libtinfo6 6.1+20181013-2+deb10u2
ii zlib1g 1:1.2.11.dfsg-1
crash recommends no packages.
Versions of packages crash suggests:
ii kexec-tools 1:2.0.18-1
ii makedumpfile 1:1.6.5-1
-- no debconf information
--- End Message ---
--- Begin Message ---
On 02/28/20 07:07, Jookia wrote:
> I did that and can confirm it fixes my solution.
Excellent, I am closing this since it is not a bug with the crash
package but rather simply how it currently works.
> Could this be enabled by default?
Potentially, but someone would have to write a patch and submit it to
the upstream project and push to get it accepted.
> As an aside, crash's documentation for this option explains that it's
> intended for x86_64 kernels, not i686 kernels.
Good point, I will raise that issue with the upstream project.
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