linux-kernel - Re: + aio-completion-signal-notification.patch added to -mm tree

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Message-ID: <20070125163407.GA238@tv-sign.ru>
Date:	Thu, 25 Jan 2007 19:34:07 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Sebastien Dugue <sebastien.dugue@...l.net>,
	Laurent Vivier <laurent.vivier@...l.net>
Cc:	Zach Brown <zach.brown@...cle.com>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: + aio-completion-signal-notification.patch added to -mm tree

On 01/25, Oleg Nesterov wrote:
>
> Sebastien Dugue wrote:
> >
> > +	if (iocb->ki_notify.notify != SIGEV_NONE) {
> > +		ret = aio_send_signal(&iocb->ki_notify);
> > +
> > +		/* If signal generation failed, release the sigqueue */
> > +		if (ret)
> > +			sigqueue_free(iocb->ki_notify.sigq);
> 
> We should not use sigqueue_free() here. It takes current->sighand->siglock
> to remove sigqueue from "struct sigpending". But current is just a "random"
> process here.

... and it is possible that current->sighand == NULL.

Oleg.

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