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Description of problem:
Twice this morning this EL-6 installation has frozen while I was reading email. The first time it was a few seconds after an automatic local backup (using rsync) had started from cron. The second time it was shortly (some minutes) after connecting, but not using, a USB mass storage device.
Version-Release number of selected component (if applicable):
2.6.32-31.el6.x86_64
How reproducible:
Haven't found any way to reproduce it.
Additional info:
There was nothing of note in /var/log/messages or any other log file. The machine was responsive to PING on the (wired) network, but I could not log in via ssh.
When the machine froze, the X display stayed the same but the mouse cursor no longer moved.
Just happened again. I had just started a virtual kvm guest, was listening to music stored on an NFS mount, and other desktop tasks. The music that had been playing was repeatedly looping over about the last half-second of playback.
I had a go at this today, and turned on SysRq handling as well so I could sync and remount r/o. After it hung, here's the netconsole output I found:
SysRq : Emergency Sync
SysRq : Emergency Remount R/O
SysRq : Emergency Sync
SysRq : Resetting
i.e. there was no console output at all between loading the netconsole module and the machine hanging -- and console output (and SysRq handling) was still working after that point.
What else can I try?
If sysrq is working, dump the processes, stack, etc.
Comment 6RHEL Program Management
2010-06-07 16:05:32 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release. Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release. This request is not yet committed for
inclusion.
Comment 7Stanislaw Gruszka
2010-06-17 21:07:08 UTC
Looks like live lock. Try to use -debug kernel, it should log info where problem is.