linux-kernel - Re: 3.12: kernel panic when resuming from suspend to RAM (x86

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Date:	Mon, 18 Nov 2013 11:33:25 +1100
From:	Kevin Easton <kevin@...rana.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Francis Moreau <francis.moro@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 3.12: kernel panic when resuming from suspend to RAM (x86_64)

On Sun, Nov 17, 2013 at 11:06:12PM +0100, Borislav Petkov wrote:
> and the virtual address in rIP is ffffffff8106f5c3, i.e. the same one
> as in the photo. Thus, the CALL instruction tries to call the timer
> function 'fn' which we pass as an argument to call_timer_fn.
> 
> However, the address we're trying to call in %r14 is garbage:
> 0x455300323d504544 and not in canonical form, causing the #GP.

That's part of an ASCII string, "DEP=2\0SE", so if that looks familiar
to anyone (part of a kernel command line?) it might give a clue to
where the timer callback pointer is being overwritten.

> So basically what happens is suspend to RAM corrupts something
> containing one or more timer functions and we end up calling crap after
> resume.

    - Kevin
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