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[PATCH] de_thread: fix lockless do_each_thread

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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>
This commit is contained in:
Oleg Nesterov 2006-06-26 00:26:04 -07:00 committed by Linus Torvalds
parent 42c3e03ef6
commit 2ceb8693ef
1 changed files with 1 additions and 2 deletions
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3
fs/exec.c
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@ -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(&current->tasks, &init_task.tasks);
list_replace_rcu(&leader->tasks, &current->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;