Attempting to clone map groups onto themselves will deadlock.
It only happens because of other bugs, but the code should
protect itself anyway.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/util/thread.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 28c4b746baa1..471102554a78 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -191,6 +191,12 @@ static int thread__clone_map_groups(struct thread *thread,
if (thread->pid_ == parent->pid_)
return 0;
+ if (thread->mg == parent->mg) {
+ dump_printf("broken map groups on thread %d/%d parent %d/%d\n",
+ thread->pid_, thread->tid, parent->pid_,
parent->tid);
+ return 0;
+ }
+
/* But this one is new process, copy maps. */
for (i = 0; i < MAP__NR_TYPES; ++i)
if (map_groups__clone(thread->mg, parent->mg, i) < 0)
--
1.9.1
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