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-rw-r--r--fs/proc/base.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 03c8d747be48..f223a56e613c 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3109,6 +3109,9 @@ static struct task_struct *first_tid(struct task_struct *leader,
pos = NULL;
if (nr && nr >= get_nr_threads(leader))
goto out;
+ /* It could be unhashed before we take rcu lock */
+ if (!pid_alive(leader))
+ goto out;
/* If we haven't found our starting place yet start
* with the leader and walk nr threads forward.