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

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Date:	Wed, 20 Nov 2013 12:15:41 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Francis Moreau <francis.moro@...il.com>
Cc:	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 Wed, Nov 20, 2013 at 10:45:05AM +0100, Francis Moreau wrote:
> Unfortunately the bisect session didn't give any positive results: I
> couldn't be sure if a specific revision was good or bad because the
> bug wasn't reproductible every time.
>
> But I got a different kernel oops on my stripped system that may give
> us a clue: http://imgur.com/zdCknbY
>
> Does this help ?

Unfortunately, this is the second oops:

"Oops: 0000 [#2] ..."

The first has scrolled off but I can see the RIP: ioread32+0x40 and the
code must be:

ffffffff812a1e40 <ioread32>:
ffffffff812a1e40:       48 81 ff ff ff 03 00    cmp    $0x3ffff,%rdi
ffffffff812a1e47:       77 37                   ja     ffffffff812a1e80 <ioread32+0x40>

...

ffffffff812a1e77:       66 0f 1f 84 00 00 00    nopw   0x0(%rax,%rax,1)
ffffffff812a1e7e:       00 00 
ffffffff812a1e80:       8b 07                   mov    (%rdi),%eax			<--- faulting insn
ffffffff812a1e82:       c3                      retq   
ffffffff812a1e83:       66 66 66 66 2e 0f 1f    data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
ffffffff812a1e8a:       84 00 00 00 00 00

and judging by the instruction, that's addr in %rdi which we try to read
and I'd guess %rdi contains garbage after resume.

IOW, this looks like another corruption that happens when you suspend to
ram.

I asked you already but you didn't say:

"Also, you can check for BIOS updates for your machine and if there are,
check their changelogs whether they fix something suspend-related."

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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