Red Hat Bugzilla – Bug 238432
kernel crash when running compressed tar backup over nfs mount
Last modified: 2009-12-14 15:38:06 EST
Description of problem:
Kernel crashes on nfs clients that push a compressed tar backup over an nfs
mount. Backups are around 3GB compressed. Crash usually occurs about 1GB into
backup. It varies quite a lot though.
Version-Release number of selected component (if applicable):
everytime backup runs
Steps to Reproduce:
1. create nfs mount to backup server
2. run compressed tar backup over nfs mount
complete system lockup
successful backup over nfs mount
Created attachment 153796 [details]
console output from crash
The hypervisor_callback() in the call trace make me suspect this is the same
problem of bug 234008. But I won't mark it as duplicate because I am not sure
it is really the same problem.
You will problably want to add your e-mail to the CC list on bug 234008, to
get news on the problem, and try a new kernel after bug 234008 is fixed, to
check if the fix solves your problem, also.
Bug #234008 has a fix on updates-testing repository, kernel-xen version
2.6.20-1.2954.fc6. Could you check if this version fix your problem, also?
Cannot test for this issue because all 2.6.20 kernels immediately crash on my
servers with an "unknown bus timing" error. I am waiting on a fix to
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=234283 for that problem.
I was supposed to mean kernel-xen version 2.6.20-1.2952.fc6.
Adding bug #234283 to the dependency list of this bug.
I have noticed you found a workaround for bug #234283. Are you able to boot
kernel-xen 2.6.20-1.2952.fc6, now?
Yes. With special tweaked BIOS settings it will boot now.
Have you been able to reproduce the problem under kernel-xen
I restarted those process a couple of day ago and I just checked and it looks
like they are completing successfully. So far I do not see any hangs.
(In reply to comment #9)
> I restarted those process a couple of day ago and I just checked and it
> like they are completing successfully. So far I do not see any hangs.
I am closing this bug, then. If you see the same problem again, feel free to
reopen the bug.
I am reopening this bug as I am seeing this behavior again using kernel
2.6.20-1.2952.fc6 also with xen kernel. What I also notice besides the complete
system hang is that on reboot I get a md2 is not clean -- starting background
reconstruction. This is the array that holds the root (/) filesystem and where
the NFS mount is located. When the kernel hang occurs it is breaking the array
as well. This also happened previously but I just wasn't connecting it to the
same event. This happens on four identically configured machines. Always md2
that breaks on all of them.
change QA contact
This report targets FC6, which is now end-of-life.
Please re-test against Fedora 7 or later, and if the issue persists, open a new bug.