From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Mon, 2 Aug 2010 21:59:28 +0000 (-0300)
Subject: perf session: Invalidate last_match when removing threads from rb_tree
X-Git-Tag: v2.6.36-rc1~532^2~3^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70597f21f128b7dd6a2490078bea99d704b6f8c3;p=pandora-kernel.git

perf session: Invalidate last_match when removing threads from rb_tree

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>
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