]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
perf: fix perf bug in fork()
authorPeter Zijlstra <peterz@infradead.org>
Thu, 2 Oct 2014 23:17:02 +0000 (16:17 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 2 Oct 2014 23:28:44 +0000 (16:28 -0700)
commit6c72e3501d0d62fc064d3680e5234f3463ec5a86
tree48b15a8bc67816fe492e1323580bf8ee99b29e81
parentcba5b1c6e2c42152135a85b90bf820b77d6527da
perf: fix perf bug in fork()

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/events/core.c
kernel/fork.c