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Date: Thu, 13 Feb 2014 18:40:20 +0100
From: Oleg Nesterov <oleg@redhat.com>
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.
Message-ID: <20140213174020.GA14455@redhat.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Eric Sandeen <sandeen@sandeen.net>, Linux Kernel <linux-kernel@vger.kernel.org>, xfs@oss.sgi.com, Al Viro <viro@zeniv.linux.org.uk>, Dave Jones <davej@redhat.com>

On 02/12, Linus Torvalds wrote:
>
> On Wed, Feb 12, 2014 at 1:14 PM, Al Viro <viro@zeniv.linux.org.uk> wrote:
> >
> > Umm...  What if we delay __sigqueue_free()?  After all, that's where the
> > fat sucker normally comes from.  That way we might get away with much
> > smaller structure on stack...
>
> Sounds like the RightThing(tm) to do to me, and I don't see why it
> wouldn't work.

Probably... I'll try to reply tomorrow.

> We'd have to teach each user of "dequeue_signal()" to free the siginfo
> thing.

And we should be careful with SIGQUEUE_PREALLOC, at least
collect_signal() should not do list_del_init()... Plus we need to
handle the SEND_SIG_FORCED-like case.

Oleg.

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