Bug 150743 - kernel panic in rwsem.h
kernel panic in rwsem.h
Status: CLOSED CURRENTRELEASE
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
4.0
x86_64 Linux
medium Severity high
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Assigned To: David Howells
Brian Brock
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Depends On:
Blocks:
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Reported: 2005-03-09 22:55 EST by Dave Miller
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

See Also:
Fixed In Version: 2.6.9-11.11.EL (U2)
Doc Type: Bug Fix
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Last Closed: 2005-08-09 05:23:22 EDT
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Description Dave Miller 2005-03-09 22:55:09 EST
Description of problem:
kernel panicked.  The message on the console mentioned rwsem.h. 
Filesystem access was lost, so no panic log was recoverable, and the
colo admin didn't get a screenshot before rebooting. :(

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-5.0.3.EL

How reproducible:
First time it's happened, hope it doesn't happen again.

Steps to Reproduce:
1. ??
  
Additional info:
This is our second kernel panic on this box with this kernel, but
since the panic error was different this time I filed a new bug.

Because of the previous experience, we already had
kernel-smp-2.6.9-6.16.EL installed and configured to boot into, so we
picked up that kernel on the post-panic reboot.  Previous issue with
this machine is bug 150044.
Comment 1 David Howells 2005-06-30 10:36:01 EDT
I don't know what I can do about this. Are you sure that "rwsem.h" was 
mentioned and not "rwsem.c" or some function whose name contains "rwsem"? 
 
We do have a patch to fix a problem with R/W semaphores that so far only crops 
up in conjunction with AIO as far as I know. Are you using AIO? 
Comment 2 Dave Miller 2005-08-08 14:02:38 EDT
I don't know of any way to get additional info, unfortunately the tech at the
scene at the time didn't have a camera to get a screenshot of the console before
rebooting it when it happened, and we were going from his memory to describe
what happened.  It's been 5 months (a 3 kernel upgrades) since then, and it
hasn't happened again, and that machine's been under pretty serious load the
entire time. :)

I would just go ahead and close this out as unreproducable or something.
Comment 3 David Howells 2005-08-09 05:23:22 EDT
Okay. I suspect this will be fixed by a patch added to RHEL4 to make  
rwsems interrupt-safe, assuming it wasn't caused indirectly by some other bug. 
This patch will be in RHEL-4 U2. Let us know if it happens again.  

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