linux-kernel - Re: 3.14-rc2 XFS backtrace because irqs

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Message-ID: <20140212113928.GO18016@ZenIV.linux.org.uk>
Date:	Wed, 12 Feb 2014 11:39:28 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Chinner <david@...morbit.com>, Dave Jones <davej@...hat.com>,
	Eric Sandeen <sandeen@...deen.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.

On Tue, Feb 11, 2014 at 10:28:12PM -0800, Linus Torvalds wrote:

> It looks like just "do_signal()" has a stack frame that is about 230
> bytes even under normal circumstancs (largely due to "struct ksignal"
> - which in turn is largely due to the insane 128-byte padding in
> siginfo_t). Add a few other frames in there, and I guess that if it
> was close before, the coredump path just makes it go off.

We could, in principle, put it into task_struct and make get_signal()
return its address - do_signal() is called only in the code that does
assorted returns to userland...
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