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Date: Fri, 14 Feb 2014 08:13:02 -0800
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.
Message-ID: <20140214161302.GA16416@infradead.org>
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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>, Oleg Nesterov <oleg@redhat.com>, Dave Jones <davej@redhat.com>

On Wed, Feb 12, 2014 at 01:32:55PM -0800, Linus Torvalds wrote:
> We'd have to teach each user of "dequeue_signal()" to free the siginfo
> thing. Which shouldn't be too bad - I think we've collected all of
> that into generic code, and there isn't the mass or architecture code
> that knows about these things any more. But there are a few odd
> drivers etc and signalfd.

The few odd drivers are nbd, jffs2 and the usb mass storage gadget.
All of these have in common that they try to handle signals in a kernel
thread (which we don't even allow by default), and that they ignore the
siginfo.  I think they could mostly be replaced by an addition to the
kthread API to allow a kthread to be killed by signals for legacy
reasons.

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