diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-08-02 18:59:28 -0300 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:57:35 -0700 |
| commit | 04c0aca8ff980e0654d4b4f519cab8da7ede638e (patch) | |
| tree | 5ae801aff989f953567580f1353a4996c509ae7c /tools | |
| parent | d6c90f5b218c1ddf1496045e3939b1c960c7cb9f (diff) | |
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/session.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index c422cd676313..af094a20505d 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -134,6 +134,7 @@ void perf_session__delete(struct perf_session *self) void perf_session__remove_thread(struct perf_session *self, struct thread *th) { + self->last_match = NULL; rb_erase(&th->rb_node, &self->threads); /* * We may have references to this thread, for instance in some hist_entry |