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Date: Sat, 12 Oct 2002 15:36:21 +0400
From: Oleg Nesterov <oleg@tv-sign.ru>
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To: linux-kernel@vger.kernel.org
CC: Ingo Molnar <mingo@elte.hu>
Subject: BUG: [RESEND] de_thread()
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Hello.

On Thu, 10 Oct 2002 Oleg Nesterov wrote:
> 
> Suppose process P in thread group was cloned _without_
> CLONE_DETACHED flag. Then another thread, group_leader
> for simplicity, does exec and calls de_thread(). It kills
> P via _broadcast_thread_group(). While doing do_exit(),
> P skips release_task(), because its exit_signal != -1,
> and becomes TASK_ZOMBIE.
> 
> Then leader calls schedule() with TASK_UNINTERRUPTIBLE
> in while(oldsig->count > 1) {...} and sleeps forever,
> because nobody can do wake_up_process(sig->group_exit_task).

Oleg.
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