From: Oleg Nesterov <oleg@tv-sign.ru>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH rc1-mm] de_thread: fix deadlockable process addition
Date: Sat, 8 Apr 2006 03:46:53 +0400 [thread overview]
Message-ID: <20060407234653.GB11460@oleg> (raw)
In-Reply-To: <m1acay1fbh.fsf@ebiederm.dsl.xmission.com>
On 04/06, Eric W. Biederman wrote:
>
> Ack. The evils of de_thread!
Yes, just noticed another thing,
[PATCH] task-make-task-list-manipulations-rcu-safe-fix-fix
We shoudn't decrement process_counts if de_thread() unhashed the task.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- MM/kernel/exit.c~ 2006-04-06 23:01:37.000000000 +0400
+++ MM/kernel/exit.c 2006-04-08 03:35:24.000000000 +0400
@@ -56,9 +56,10 @@ static void __unhash_process(struct task
detach_pid(p, PIDTYPE_SID);
/* see de_thread()->list_replace_rcu() */
- if (likely(p->tasks.prev != LIST_POISON2))
+ if (likely(p->tasks.prev != LIST_POISON2)) {
list_del_rcu(&p->tasks);
- __get_cpu_var(process_counts)--;
+ __get_cpu_var(process_counts)--;
+ }
}
list_del_rcu(&p->thread_group);
remove_parent(p);
next prev parent reply other threads:[~2006-04-07 19:49 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-06 22:04 [PATCH rc1-mm] de_thread: fix deadlockable process addition Oleg Nesterov
2006-04-06 22:58 ` Eric W. Biederman
2006-04-07 23:46 ` Oleg Nesterov [this message]
2006-04-07 22:51 ` Andrew Morton
2006-04-07 22:56 ` Andrew Morton
2006-04-08 7:55 ` Eric W. Biederman
2006-04-08 17:27 ` Oleg Nesterov
2006-04-08 16:07 ` Eric W. Biederman
2006-04-08 21:13 ` Oleg Nesterov
2006-04-08 21:23 ` Oleg Nesterov
2006-04-10 22:11 ` Eric W. Biederman
2006-04-10 23:07 ` [PATCH] de_thread: Don't confuse users do_each_thread Eric W. Biederman
2006-04-10 23:16 ` Eric W. Biederman
2006-04-10 23:52 ` Ingo Oeser
2006-04-11 6:18 ` Eric W. Biederman
2006-04-11 10:19 ` Oleg Nesterov
2006-04-11 7:25 ` Ingo Oeser
2006-04-11 7:36 ` Eric W. Biederman
2006-04-11 19:50 ` Ingo Oeser
2006-04-11 10:05 ` Oleg Nesterov
2006-04-11 5:23 ` Andrew Morton
2006-04-11 10:47 ` Oleg Nesterov
2006-04-11 6:23 ` Eric W. Biederman
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