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Bug 598910 - Hangs during desktop use
Hangs during desktop use
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
low Severity medium
: rc
: ---
Assigned To: Red Hat Kernel Manager
Red Hat Kernel QE team
Depends On:
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Reported: 2010-06-02 06:40 EDT by Tim Waugh
Modified: 2010-06-21 08:31 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-06-21 08:31:32 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Tim Waugh 2010-06-02 06:40:36 EDT
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):

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.
Comment 2 Tim Waugh 2010-06-02 07:35:00 EDT
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.
Comment 3 Bill Nottingham 2010-06-02 15:30:15 EDT
Any chance you can get netconsole output?
Comment 4 Tim Waugh 2010-06-03 06:43:09 EDT
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?
Comment 5 Bill Nottingham 2010-06-03 12:08:22 EDT
If sysrq is working, dump the processes, stack, etc.
Comment 6 RHEL Product and Program Management 2010-06-07 12:05:32 EDT
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
Comment 7 Stanislaw Gruszka 2010-06-17 17:07:08 EDT
Looks like live lock. Try to use -debug kernel, it should log info where problem is.
Comment 8 Tim Waugh 2010-06-21 08:31:32 EDT
I haven't seen this happen at all with recent kernel updates.

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