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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:39 -0700
commit15b9f360c0316c06d37c09b02d85565edbaf9dd3 (patch)
tree5e874b98b6f16ca1f376f5e4bd480da7ae5143b6 /fs
parent246bb0b1deb29726990620d8b5e55ca29f331362 (diff)
downloadlinux-2.6.34-ux500-15b9f360c0316c06d37c09b02d85565edbaf9dd3.tar.gz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c5
1 files changed, 3 insertions, 2 deletions
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);