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Date: Tue, 15 Aug 2006 09:21:46 -0700
From: Andrew Morton <akpm@osdl.org>
To: Frederik Deweerdt <deweerdt@free.fr>
Cc: linux-kernel@vger.kernel.org, airlied@linux.ie,
       Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>
Subject: Re: 2.6.18-rc4-mm1 BUG, drm related
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On Tue, 15 Aug 2006 17:37:26 +0000
Frederik Deweerdt <deweerdt@free.fr> wrote:

> On Tue, Aug 15, 2006 at 07:16:32AM -0700, Andrew Morton wrote:
> > On Tue, 15 Aug 2006 13:25:56 +0000
> > Frederik Deweerdt <deweerdt@free.fr> wrote:
> > 
> > > On Sun, Aug 13, 2006 at 01:24:54AM -0700, Andrew Morton wrote:
> > > > 
> > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc4/2.6.18-rc4-mm1/
> > > > 
> > > Hi,
> > > 
> > > There are two BUGs with 2.6.18-rc4-mm1 that seem related to (I did the
> > > bisection[1]):
> > > git-drm.patch
> > > drm-build-fix.patch
> > > drm-build-fixes-2.patch
> > > allow-drm-detection-of-new-via-chipsets.patch
> > > git-drm-build-fix.patch
> > > 
> > > Here's one of the BUGs (the second one is on the web site below).
> > > [   40.276000] [drm:drm_unlock] *ERROR* Process 8914 using kernel context 0
> > 
> > I guess the above is a non-fatal DRM warning.
> > 
> > The below is an ALSA oops.
> Hmm, that's what I thought at first, but consider the second BUG (as I
> said, both BUGs, the ALSA one and that one appear alternatively):
> [   35.600000] [drm:drm_unlock] *ERROR* Process 8835 using kernel context 0
> [   36.328000] BUG: unable to handle kernel paging request at virtual address 746c6139

0.7 seconds is a loooong time.

> [   36.328000]  printing eip:
> [   36.328000] c01fcf39
> [   36.328000] *pde = 00000000
> [   36.328000] Oops: 0000 [#1]
> [   36.328000] PREEMPT 
> [   36.328000] last sysfs file: /devices/pci0000:00/0000:00:1d.7/usb5/5-0:1.0/bInterfaceProtocol
> [   36.328000] Modules linked in: snd_seq snd_seq_device ohci_hcd parport_pc parport pcspkr ipw2200 yenta_socket rsrc_nonstatic pcmcia_core snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore snd_page_alloc ehci_hcd uhci_hcd usbcore cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_conservative speedstep_centrino freq_table processor ac battery i915 drm tg3 tsdev joydev
> [   36.328000] CPU:    0
> [   36.328000] EIP:    0060:[<c01fcf39>]    Not tainted VLI
> [   36.328000] EFLAGS: 00010297   (2.6.18-rc4-def01 #12) 
> [   36.328000] EIP is at vsnprintf+0x2da/0x4f9
> [   36.328000] eax: 746c6139   ebx: 0000000a   ecx: 746c6139   edx: fffffffe
> [   36.328000] esi: f75fa28c   edi: 00000000   ebp: f3701ebc   esp: f3701e80
> [   36.328000] ds: 007b   es: 007b   ss: 0068
> [   36.328000] Process modprobe (pid: 8872, ti=f3700000 task=f7189540 task.ti=f3700000)
> [   36.328000] Stack: f75fa283 f75fb000 00000002 00000000 0000000a fffffffb 00000000 00000000 
> [   36.328000]        ffffffff ffffffff ffffffff f75fb000 f7129240 f8a1f980 f7129240 f3701ed8 
> [   36.328000]        c01948a4 f75fa28c 00000d74 c039b84c f3701eec c039ad97 f3701efc c013fd08 
> [   36.328000] Call Trace:
> [   36.328000]  [<c01948a4>] seq_printf+0x32/0x55
> [   36.328000]  [<c013fd08>] print_unload_info+0x6f/0xe9
> [   36.328000]  [<c0142073>] m_show+0x4b/0xb5
> [   36.328000]  [<c019440f>] seq_read+0x248/0x2ee
> [   36.328000]  [<c0171bef>] vfs_read+0x1c1/0x1c6
> [   36.328000]  [<c0171f0a>] sys_read+0x4b/0x75
> [   36.328000]  [<c0103139>] sysenter_past_esp+0x56/0x8d
> [   36.328000]  [<b7fb7410>] 0xb7fb7410
> [   36.328000]  [<c0104205>] show_stack_log_lvl+0x98/0xb2
> [   36.328000]  [<c0104434>] show_registers+0x1b7/0x22f
> [   36.328000]  [<c010460a>] die+0x11e/0x226
> [   36.328000]  [<c0379dc2>] do_page_fault+0x38c/0x616
> [   36.328000]  [<c0103cad>] error_code+0x39/0x40
> [   36.328000]  [<c01948a4>] seq_printf+0x32/0x55
> [   36.328000]  [<c013fd08>] print_unload_info+0x6f/0xe9
> [   36.328000]  [<c0142073>] m_show+0x4b/0xb5
> [   36.328000]  [<c019440f>] seq_read+0x248/0x2ee
> [   36.328000]  [<c0171bef>] vfs_read+0x1c1/0x1c6
> [   36.328000]  [<c0171f0a>] sys_read+0x4b/0x75
> [   36.328000]  [<c0103139>] sysenter_past_esp+0x56/0x8d
> [   36.328000] Code: fd ff ff 83 cf 40 bb 10 00 00 00 eb 88 8b 45 14 83 45 14 04 8b 55 e8 8b 08 b8 e4 81 3a c0 81 f9 ff 0f 00 00 0f 46 c8 89 c8 eb 06 <80> 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 83 e7 10 89 c3 0f 85 
> [   36.328000] EIP: [<c01fcf39>] vsnprintf+0x2da/0x4f9 SS:ESP 0068:f3701e80
> 
> Please notice how the BUG comes right after the drm warning.

Coincidence, I'd say.

This one looks like something horrid happened in the module dependency
chain.  Heaven knows.  Using ascii `tle9' as a pointer?

CONFIG_DEBUG_PAGEALLOC might tell us more.
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