---

yaml
---
r: 84671
b: refs/heads/master
c: d36174b
h: refs/heads/master
i:
  84669: 435f932
  84667: 69bdfc8
  84663: b16a391
  84655: ba55246
  84639: 7d3a65a
  84607: 824f890
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f374ada53bd1ca7c16d7607369fccc6769704956
+refs/heads/master: d36174bc2bce0372693a9cfbdef8b2689c9982cb

trunk/kernel/signal.c

@@ -1050,17 +1050,26 @@ int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
 
 int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
 {
-	int error;
+	int error = -ESRCH;
 	struct task_struct *p;
 
 	rcu_read_lock();
 	if (unlikely(sig_needs_tasklist(sig)))
 		read_lock(&tasklist_lock);
 
+retry:
 	p = pid_task(pid, PIDTYPE_PID);
-	error = -ESRCH;
-	if (p)
+	if (p) {
 		error = group_send_sig_info(sig, info, p);
+		if (unlikely(error == -ESRCH))
+			/*
+			 * The task was unhashed in between, try again.
+			 * If it is dead, pid_task() will return NULL,
+			 * if we race with de_thread() it will find the
+			 * new leader.
+			 */
+			goto retry;
+	}
 
 	if (unlikely(sig_needs_tasklist(sig)))
 		read_unlock(&tasklist_lock);