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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-06-26 00:26:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:26 -0700 |
| commit | 2ceb8693ef63ae3d154ce1a05d275f2bb20a5e4c (patch) | |
| tree | 6e61f8c5513cb905d6326417b0e95f27d3623735 /fs/exec.c | |
| parent | 42c3e03ef6b298813557cdb997bd6db619cd65a2 (diff) | |
| download | lwn-2ceb8693ef63ae3d154ce1a05d275f2bb20a5e4c.tar.gz lwn-2ceb8693ef63ae3d154ce1a05d275f2bb20a5e4c.zip | |
[PATCH] de_thread: fix lockless do_each_thread
We should keep the value of old_leader->tasks.next in de_thread, otherwise
we can't do for_each_process/do_each_thread without tasklist_lock held.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.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, 1 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c index 8c5196087f31..fffea1eef8dc 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -707,7 +707,7 @@ static int de_thread(struct task_struct *tsk) attach_pid(current, PIDTYPE_PID, current->pid); attach_pid(current, PIDTYPE_PGID, current->signal->pgrp); attach_pid(current, PIDTYPE_SID, current->signal->session); - list_add_tail_rcu(¤t->tasks, &init_task.tasks); + list_replace_rcu(&leader->tasks, ¤t->tasks); current->group_leader = current; leader->group_leader = current; @@ -715,7 +715,6 @@ static int de_thread(struct task_struct *tsk) /* Reduce leader to a thread */ detach_pid(leader, PIDTYPE_PGID); detach_pid(leader, PIDTYPE_SID); - list_del_init(&leader->tasks); current->exit_signal = SIGCHLD; |