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): kernel 2.6.19-1.2895.fc6xen How reproducible: everytime backup runs Steps to Reproduce: 1. create nfs mount to backup server 2. run compressed tar backup over nfs mount 3. Actual results: complete system lockup kernel crash Expected results: successful backup over nfs mount Additional info:
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.
Hi, 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 2.6.20-1.2952.fc6?
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 looks > 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.
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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. Thanks