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-rw-r--r--fs/exec.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c
index b08367abf30e..d219541db06c 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -967,6 +967,14 @@ static int de_thread(struct task_struct *tsk)
BUG_ON(leader->exit_state != EXIT_ZOMBIE);
leader->exit_state = EXIT_DEAD;
+
+ /*
+ * We are going to release_task()->ptrace_unlink() silently,
+ * the tracer can sleep in do_wait(). EXIT_DEAD guarantees
+ * the tracer wont't block again waiting for this thread.
+ */
+ if (unlikely(leader->ptrace))
+ __wake_up_parent(leader, leader->parent);
write_unlock_irq(&tasklist_lock);
release_task(leader);

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