linux-kernel - Re: [PATCH 1/1] signal: make group kill signal fatal

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Message-ID: <4A25211C.8050504@gmail.com>
Date:	Tue, 02 Jun 2009 14:54:52 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, ebiederm@...ssion.com,
	roland@...hat.com, linux-kernel@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH 1/1] signal: make group kill signal fatal

On 05/26/2009 12:51 AM, Oleg Nesterov wrote:
> Heh. In this case you have another (long-standing) issue, please note
> the "if (p->flags & PF_EXITING)" check in wants_signal().
> 
> There is no guarantee the signal will wake up the exiting task task.
> Even SIGKILL, even if you use wait_event_interruptible() instead of
> _killable.

Last question, doesn't wait_event_interruptible return immediately in
this case? signal_pending returns true due to non-captured signal which
killed the application and hence we are in the .release under these
special circumstances. I think this is not much expected behavior, is
it? Shouldn't be that signal dequeued/cleared instead?
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