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Old 03-02-2012, 08:34 PM
Tim Gardner
 
Default APPLIED: ACK: ipc/sem.c: fix race with concurrent semtimedop() timeouts and IPC_RMID

On 03/02/2012 02:22 PM, Seth Forshee wrote:

On Fri, Mar 02, 2012 at 01:18:54PM -0300, Herton R. Krzesinski wrote:

SRU justification
=================

Impact
------
Kernel crash, due to race explained in upstream bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=27142
In practice likely to happen on a highly loaded webserver

Fix
---
Upstream commit d694ad62bf539dbb20a0899ac2a954555f9e4a83

Testcase
--------
https://bugzilla.kernel.org/attachment.cgi?id=66162
I'll attach to this bug as well.
- Build with gcc -o timedrm timedrm.cpp -lpthread
- Run with "test 250", sometimes you have to run more than one time to get the
oops, but it's very easy to get the crash.

Note: only needed for natty. The problem affects 2.6.35 and later, but
we already got fixes for Maverick/Oneiric through stable, Precise has
the fix in also.

--
[]'s
Herton

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Tim Gardner tim.gardner@canonical.com

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