path: root/kernel/exit.c
diff options
authorOleg Nesterov <oleg@tv-sign.ru>2008-02-08 04:19:12 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:27 -0800
commitd12619b5ff5664623524aef796514d1946ea3b4a (patch)
tree23140ca0148f9154440d3056e2040d8df468a24b /kernel/exit.c
parent430c623121ea88ca80595c99fdc63b7f8a803ae5 (diff)
fix group stop with exit race
do_signal_stop() counts all sub-thread and sets ->group_stop_count accordingly. Every thread should decrement ->group_stop_count and stop, the last one should notify the parent. However a sub-thread can exit before it notices the signal_pending(), or it may be somewhere in do_exit() already. In that case the group stop never finishes properly. Note: this is a minimal fix, we can add some optimizations later. Say we can return quickly if thread_group_empty(). Also, we can move some signal related code from exit_notify() to exit_signals(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Davide Libenzi <davidel@xmailserver.org> Cc: Ingo Molnar <mingo@elte.hu> 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 'kernel/exit.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index d7815f57088..8f3bf53a5b4 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -947,7 +947,7 @@ fastcall NORET_TYPE void do_exit(long code)
- tsk->flags |= PF_EXITING;
+ exit_signals(tsk); /* sets PF_EXITING */
* tsk->flags are checked in the futex code to protect against
* an exiting task cleaning up the robust pi futexes.