linux-kernel - Re: Linux 2.6.38-rc6

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Message-ID: <AANLkTinxHVDwSCouTaZEvR3yTJnSPAas9z6JauGDdS7=@mail.gmail.com>
Date:	Wed, 23 Feb 2011 19:16:05 +0200
From:	Anca Emanuel <anca.emanuel@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Airlie <airlied@...hat.com>, linux-fbdev@...r.kernel.org,
	Ben Skeggs <bskeggs@...hat.com>,
	dri-devel@...ts.freedesktop.org, Borislav Petkov <bp@...64.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.38-rc6

On Wed, Feb 23, 2011 at 6:32 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Feb 22, 2011 at 9:42 PM, Anca Emanuel <anca.emanuel@...il.com> wrote:
>> General protection fault:
>> http://i.imgur.com/TBJ6y.jpg
>>
>> dmesg: http://pastebin.com/qD8pR8QH
>> config: http://pastebin.com/XEurtHWi
>
> That's drivers/video/fbmem.c: fb_release(), and the "Code:"
> disassembly shows that it is
>
>  1b:   e8 f7 c0 29 00          callq  xyz
>  20:   48 8b 93 b8 03 00 00    mov    0x3b8(%rbx),%rdx
>  27:*  48 8b 42 10             mov    0x10(%rdx),%rax     <-- trapping instruction
>
> which corresponds to
>
>        mutex_lock(&info->lock);
>        if (info->fbops->fb_release)
>                info->fbops->fb_release(info,1);
>
> so it looks like 'info->fbops' is invalid. It's in %rdx, and is
> 0x00d000ae00b500c2, which is definitely not a valid pointer. Looks
> like some bad corruption (looks like a sequence of 16-bit numbers, but
> it could be anything).
>
> Looks like nouveafb took over from vesafb. Did you do anything special
> to trigger this?

No. Just boot the system.

>
> Also, you do seem to have some extra patches (yama at the least). Anything else?

I used git clone, nothing else.
First time 2.6.38-rc6 was working.
After an update from ubuntu I get that error at boot.

The dmesg is from Ubuntu 11.04 with their kernel and is working fine.

>
>                            Linus
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