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authorPeter Zijlstra2014-02-24 12:06:12 +0100
committerIngo Molnar2014-02-27 12:38:03 +0100
commite3703f8cdfcf39c25c4338c3ad8e68891cca3731 (patch)
treeb4fc6439f43eca37c954ce4d5d2848279b115b99 /tools/perf/arch/x86/util/unwind.c
parent26e61e8939b1fe8729572dabe9a9e97d930dd4f6 (diff)
perf: Fix hotplug splat
Drew Richardson reported that he could make the kernel go *boom* when hotplugging while having perf events active. It turned out that when you have a group event, the code in __perf_event_exit_context() fails to remove the group siblings from the context. We then proceed with destroying and freeing the event, and when you re-plug the CPU and try and add another event to that CPU, things go *boom* because you've still got dead entries there. Reported-by: Drew Richardson <drew.richardson@arm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/n/tip-k6v5wundvusvcseqj1si0oz0@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/arch/x86/util/unwind.c')
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