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| author | Peter Zijlstra <peterz@infradead.org> | 2012-06-22 13:36:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-24 13:58:20 +0200 |
| commit | 8323f26ce3425460769605a6aece7a174edaa7d1 (patch) | |
| tree | 44daa0dafa49cedc9301efd1417c6c2ac338c1c7 /arch/x86/kernel | |
| parent | sched: Improve balance_cpu() to consider other cpus in its group as target of... (diff) | |
| download | linux-8323f26ce3425460769605a6aece7a174edaa7d1.tar.xz linux-8323f26ce3425460769605a6aece7a174edaa7d1.zip | |
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.bader@canonical.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1340364965.18025.71.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
0 files changed, 0 insertions, 0 deletions