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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2005-10-30 15:02:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:19 -0800 |
| commit | 932aeafbe8521a9a9d790152d66020e0fef2029b (patch) | |
| tree | 09b95edbd9c160962027a9b3dcbf3cb7fc7a2b90 /fs/exec.c | |
| parent | 2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5 (diff) | |
| download | linux-stable-932aeafbe8521a9a9d790152d66020e0fef2029b.tar.gz linux-stable-932aeafbe8521a9a9d790152d66020e0fef2029b.tar.bz2 linux-stable-932aeafbe8521a9a9d790152d66020e0fef2029b.zip | |
[PATCH] fix de_thread vs it_real_fn() deadlock
de_thread() calls del_timer_sync(->real_timer) under ->sighand->siglock.
This is deadlockable, it_real_fn sends a signal and needs this lock too.
Also, delete unneeded ->real_timer.data assignment.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index 1de69cdc0e6c..fc02dadc604a 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -641,8 +641,10 @@ static inline int de_thread(struct task_struct *tsk) * before we can safely let the old group leader die. */ sig->real_timer.data = (unsigned long)current; + spin_unlock_irq(lock); if (del_timer_sync(&sig->real_timer)) add_timer(&sig->real_timer); + spin_lock_irq(lock); } while (atomic_read(&sig->count) > count) { sig->group_exit_task = current; @@ -654,7 +656,6 @@ static inline int de_thread(struct task_struct *tsk) } sig->group_exit_task = NULL; sig->notify_count = 0; - sig->real_timer.data = (unsigned long)current; spin_unlock_irq(lock); /* |