tree f2f5903683c1b9c3553d5691fb92d09b10c8352a
parent 88cb997ad11b6211784d128a29137064513ced0e
author Arnaldo Carvalho de Melo <acme@redhat.com> 1280786368 -0300
committer Giulio Cervera <giulio.cervera@gmail.com> 1305215180 +0200

perf session: Invalidate last_match when removing threads from rb_tree

[ upstream commit 70597f21f128b7dd6a2490078bea99d704b6f8c3 ]

If we receive two PERF_RECORD_EXIT for the same thread, we can end up
reusing session->last_match and trying to remove the thread twice from
the rb_tree, causing a segfault, so invalidade last_match in
perf_session__remove_thread.

Receiving two PERF_RECORD_EXIT for the same thread is a bug, but its a
harmless one if we make the tool more robust, like this patch does.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>