From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Fri, 25 Jul 2008 08:47:39 +0000 (-0700)
Subject: coredump: zap_threads() must skip kernel threads
X-Git-Tag: v2.6.27-rc1~346
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=15b9f360c0316c06d37c09b02d85565edbaf9dd3;p=linux-2.6-omap-h63xx.git

coredump: zap_threads() must skip kernel threads

The main loop in zap_threads() must skip kthreads which may use the same
mm.  Otherwise we "kill" this thread erroneously (for example, it can not
fork or exec after that), and the coredumping task stucks in the
TASK_UNINTERRUPTIBLE state forever because of the wrong ->core_waiters
count.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/exec.c b/fs/exec.c
index cd2e8c9b124..e347e6ed161 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1574,11 +1574,12 @@ static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 	for_each_process(g) {
 		if (g == tsk->group_leader)
 			continue;
-
+		if (g->flags & PF_KTHREAD)
+			continue;
 		p = g;
 		do {
 			if (p->mm) {
-				if (p->mm == mm) {
+				if (unlikely(p->mm == mm)) {
 					lock_task_sighand(p, &flags);
 					zap_process(p);
 					unlock_task_sighand(p, &flags);