Bug 714162 - kdump kernel crash during panic handling, kvm guest
kdump kernel crash during panic handling, kvm guest
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
: Regression
Depends On:
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Reported: 2011-06-17 10:09 EDT by Frank Ch. Eigler
Modified: 2013-04-05 15:47 EDT (History)
8 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-04-05 15:47:10 EDT
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Attachments (Terms of Use)
serial console logs from guest kernel, then crash, then kdump kernel (91.88 KB, text/plain)
2011-06-17 10:09 EDT, Frank Ch. Eigler
no flags Details

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Description Frank Ch. Eigler 2011-06-17 10:09:39 EDT
Created attachment 505279 [details]
serial console logs from guest kernel, then crash, then kdump kernel

A kdump kernel reproducibly fails to start after an induced crash.
This is for a rawhide x86-64 instance, running inside a KVM guest (4 CPU,
2000MB RAM).

This is how the main guest kernel is started up:

[    0.000000] Kernel command line: ro root=/dev/mapper/VolGroup-lv_root nomodes
et SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=us rd_plytheme=text crash
kernel=64m@128m divider=10 selinux=0 console=ttyS0,115200 console=tty0

With a working "service kdump on" etc.  A "echo c > /proc/sysrq-trigger"
reboots the guest, starting up the kdump kernel image:

[    0.000000] Linux version 2.6.39-0.rc7.git0.0.fc16.x86_64 (mockbuild@x86-13.p
hx2.fedoraproject.org) (gcc version 4.6.0 20110428 (Red Hat 4.6.0-6) (GCC) ) #1 
SMP Tue May 10 13:14:43 UTC 2011

but it hangs soon thereafter

[    0.374375] Switching to clocksource kvm-clock
[    0.376705] Switched to NOHz mode on CPU #0

and no /var/crash data gets made.
Comment 1 CAI Qian 2011-06-17 10:21:31 EDT
In any case, this looks like more of a kernel bug rather than kexec-tools. I am pretty sure kdump for kvm guest was working in upstream before, so we can bisect a little bit to find out where this regression was introduced.
Comment 2 Frank Ch. Eigler 2011-06-17 11:00:02 EDT
Further testing indicates that changing to ... crashkernel=128m@128m ...
makes the kdump process work more of the time (but still not 100%).
Comment 3 Josh Boyer 2012-02-21 14:46:45 EST
Frank, this was reported against 2.6.39, which is fairly old by now.  Are you still having kdump issues on that machine with the 3.2 or 3.3-rc3/rc4 kernels?
Comment 4 Fedora End Of Life 2013-04-03 11:36:50 EDT
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.

(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)

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