Bug 598910 - Hangs during desktop use
Summary: Hangs during desktop use
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel   
(Show other bugs)
Version: 6.0
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Red Hat Kernel Manager
QA Contact: Red Hat Kernel QE team
Depends On:
TreeView+ depends on / blocked
Reported: 2010-06-02 10:40 UTC by Tim Waugh
Modified: 2010-06-21 12:31 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-06-21 12:31:32 UTC
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 10:40:36 UTC
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 11:35:00 UTC
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 19:30:15 UTC
Any chance you can get netconsole output?

Comment 4 Tim Waugh 2010-06-03 10:43:09 UTC
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 16:08:22 UTC
If sysrq is working, dump the processes, stack, etc.

Comment 6 RHEL Product and 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

Comment 7 Stanislaw Gruszka 2010-06-17 21:07:08 UTC
Looks like live lock. Try to use -debug kernel, it should log info where problem is.

Comment 8 Tim Waugh 2010-06-21 12:31:32 UTC
I haven't seen this happen at all with recent kernel updates.

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