1 files changed, 8 insertions, 1 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index d0b7d988f873..e6e01b959a0e 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1540,8 +1540,15 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
         }
 
         /* dead body doesn't have much to contribute */
-        if (p->exit_state == EXIT_DEAD)
+        if (unlikely(p->exit_state == EXIT_DEAD)) {
+                /*
+                 * But do not ignore this task until the tracer does
+                 * wait_task_zombie()->do_notify_parent().
+                 */
+                if (likely(!ptrace) && unlikely(ptrace_reparented(p)))
+                        wo->notask_error = 0;
                 return 0;
+        }
 
         /* slay zombie? */
         if (p->exit_state == EXIT_ZOMBIE) {