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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>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:39 -07:00 committed by Linus Torvalds
parent 246bb0b1de
commit 15b9f360c0
1 changed files with 3 additions and 2 deletions
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5
fs/exec.c
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@ -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);