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Date: Thu, 13 Feb 2014 19:37:36 +0100
From: Oleg Nesterov <oleg@redhat.com>
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.
Message-ID: <20140213183736.GA16937@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 02/13, Oleg Nesterov wrote:
>
> On 02/13, Linus Torvalds wrote:
> >
> > On Thu, Feb 13, 2014 at 9:40 AM, Oleg Nesterov <oleg@redhat.com> wrote:
> > >
> > > 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.
> >
> > I don't think the users need to care. They'd just call
> > "sigqueue_free()" not knowing about our preallocations etc.
>
> Yes, but we need to be careful to avoid the races with
> release_posix_timer().

Plus we need to delay do_schedule_next_timer() as well. But this
is probably good because we can avoid unlock/lock(siglock) in
dequeue_signal().

Oleg.

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