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| author | Peter Zijlstra <peterz@infradead.org> | 2014-10-02 16:17:02 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-10-13 16:09:18 +0200 |
| commit | 07b5661fe33df525931853f6869f7f5fd68d291e (patch) | |
| tree | c3775ac3c7df1330ce52ffb6fdbcad517d2d5ab5 /mm | |
| parent | 8ec4e9789b8b4c05ee979daad2a27088e29fac5d (diff) | |
| download | lwn-07b5661fe33df525931853f6869f7f5fd68d291e.tar.gz lwn-07b5661fe33df525931853f6869f7f5fd68d291e.zip | |
perf: fix perf bug in fork()
commit 6c72e3501d0d62fc064d3680e5234f3463ec5a86 upstream.
Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by
calling perf_event_free_task() when failing sched_fork() we will not yet
have done the memset() on ->perf_event_ctxp[] and will therefore try and
'free' the inherited contexts, which are still in use by the parent
process. This is bad..
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions