From: Namhyung Kim <namhy...@kernel.org>

When thread__init_map_groups() fails, a new thread should be removed
from the rbtree since it's gonna be freed.  Also update last match cache
only if the function succeeded.

Reported-by: David Ahern <dsah...@gmail.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
Acked-by: Jiri Olsa <jo...@kernel.org>
Cc: David Ahern <dsah...@gmail.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Link: 
http://lkml.kernel.org/r/1420763892-15535-1-git-send-email-namhy...@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/util/machine.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 94de3e48b490..1bca3a9f2b16 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -389,7 +389,6 @@ static struct thread *__machine__findnew_thread(struct 
machine *machine,
        if (th != NULL) {
                rb_link_node(&th->rb_node, parent, p);
                rb_insert_color(&th->rb_node, &machine->threads);
-               machine->last_match = th;
 
                /*
                 * We have to initialize map_groups separately
@@ -400,9 +399,12 @@ static struct thread *__machine__findnew_thread(struct 
machine *machine,
                 * leader and that would screwed the rb tree.
                 */
                if (thread__init_map_groups(th, machine)) {
+                       rb_erase(&th->rb_node, &machine->threads);
                        thread__delete(th);
                        return NULL;
                }
+
+               machine->last_match = th;
        }
 
        return th;
-- 
1.9.3

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