Merge tag 'kvm-arm-for-4.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / tools / perf / util / thread.c

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 28c4b746baa19bef9830814c4fe7c69f1be0b06b..0a9ae8014729c085ffd2872e2bc13871f79c9908 100644 (file)
--- 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) {
+               pr_debug("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)