On Tue, Jul 24, 2012 at 8:21 AM, tip-bot for Peter Zijlstra <pet...@infradead.org> wrote: > Commit-ID: 8323f26ce3425460769605a6aece7a174edaa7d1 > Gitweb: http://git.kernel.org/tip/8323f26ce3425460769605a6aece7a174edaa7d1 > Author: Peter Zijlstra <pet...@infradead.org> > AuthorDate: Fri, 22 Jun 2012 13:36:05 +0200 > Committer: Ingo Molnar <mi...@kernel.org> > CommitDate: Tue, 24 Jul 2012 13:58:20 +0200 > > sched: Fix race in task_group() > > Stefan reported a crash on a kernel before a3e5d1091c1 ("sched: > Don't call task_group() too many times in set_task_rq()"), he > found the reason to be that the multiple task_group() > invocations in set_task_rq() returned different values. > > Looking at all that I found a lack of serialization and plain > wrong comments. > > The below tries to fix it using an extra pointer which is > updated under the appropriate scheduler locks. Its not pretty, > but I can't really see another way given how all the cgroup > stuff works. > > Reported-and-tested-by: Stefan Bader <stefan.ba...@canonical.com> > Signed-off-by: Peter Zijlstra <a.p.zijls...@chello.nl> > Link: http://lkml.kernel.org/r/1340364965.18025.71.camel@twins > Signed-off-by: Ingo Molnar <mi...@kernel.org>
I just finished bisecting a crash on boot to this commit; booting with "noautogroup" brings it back. 3.5.4 is the latest -stable that still boots, and none of the 3.6 rc's boot at all. Photo of the bug (3.6.0next is 3.6 + btrfs's for-linus): https://lh5.googleusercontent.com/-0DY-YYhgvzs/UHdB-BQdzMI/AAAAAAAAAEg/QhY9rgxnv98/s811/2012-10-11 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
