Linux Archive - ACK: ipc/sem.c: fix race with concurrent semtimedop() timeouts and IPC

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
>
> --
> kernel-team mailing list
> kernel-team@lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

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