diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2015-01-29 14:44:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-02-04 08:07:12 +0100 |
| commit | a83fe28e2e45392464858a96745db26ac73670c8 (patch) | |
| tree | f5512a81ef46a14319e1600079b36e9cea11ee90 /Documentation/trace/postprocess | |
| parent | 8f95b435b62522aed3381aaea920de8d09ccabf3 (diff) | |
perf: Fix put_event() ctx lock
So what I suspect; but I'm in zombie mode today it seems; is that while
I initially thought that it was impossible for ctx to change when
refcount dropped to 0, I now suspect its possible.
Note that until perf_remove_from_context() the event is still active and
visible on the lists. So a concurrent sys_perf_event_open() from another
task into this task can race.
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Stephane Eranian <eranian@gmail.com>
Cc: mark.rutland@arm.com
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20150129134434.GB26304@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/trace/postprocess')
0 files changed, 0 insertions, 0 deletions