2.6.18-rc4-mm1 BUG, drm related

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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
[   41.024000] BUG: unable to handle kernel paging request at virtual address 6e756f73
[   41.024000]  printing eip:
[   41.024000] c01b5771
[   41.024000] *pde = 00000000
[   41.024000] Oops: 0000 [#1]
[   41.024000] 8K_STACKS PREEMPT 
[   41.024000] last sysfs file: /devices/pci0000:00/0000:00:1d.7/usb5/5-0:1.0/bInterfaceProtocol
[   41.024000] 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 joydev tsdev
[   41.024000] CPU:    0
[   41.024000] EIP:    0060:[<c01b5771>]    Not tainted VLI
[   41.024000] EFLAGS: 00210246   (2.6.18-rc4-mm1-def01 #1) 
[   41.024000] EIP is at sysfs_lookup+0x65/0xb0
[   41.024000] eax: f3161e40   ebx: f316842c   ecx: f73f6280   edx: f316842c
[   41.024000] esi: 6e756f73   edi: f3161ec4   ebp: f6c35dfc   esp: f6c35de0
[   41.024000] ds: 007b   es: 007b   ss: 0068
[   41.024000] Process modprobe (pid: 8952, ti=f6c34000 task=f7d17550 task.ti=f6c34000)
[   41.024000] Stack: f316842c f3161e94 f31684bc 00000000 fffffff4 f73f72ec f3161e40 f6c35e1c 
[   41.024000]        c0184d42 f73f72ec f3161e40 00000000 ffffffff c03a6656 12fd28db f6c35e4c 
[   41.024000]        c0184e02 f6c35e30 f3161ee8 00000000 12fd28db 00000005 c03a6651 c038230e 
[   41.024000] Call Trace:
[   41.024000]  [<c0184d42>] __lookup_hash+0x9d/0xcc
[   41.024000]  [<c0184e02>] lookup_one_len+0x71/0x86
[   41.024000]  [<c01b51da>] create_dir+0x43/0x23f
[   41.024000]  [<c01b53fc>] sysfs_create_subdir+0x26/0x28
[   41.024000]  [<c01b6c56>] sysfs_create_group+0x77/0x97
[   41.024000]  [<c02903af>] dpm_sysfs_add+0x1e/0x20
[   41.024000]  [<c028f6b3>] device_pm_add+0x64/0x89
[   41.024000]  [<c028930a>] device_add+0x1d9/0x380
[   41.024000]  [<c02894cb>] device_register+0x1a/0x20
[   41.024000]  [<c0289811>] device_create+0xaa/0xc4
[   41.024000]  [<f8a0c472>] snd_register_device+0xcf/0x104 [snd]
[   41.024000]  [<f8abd0c2>] snd_sequencer_device_init+0x4e/0x7c [snd_seq]
[   41.024000]  [<f8abd02f>] alsa_seq_init+0x2f/0x51 [snd_seq]
[   41.024000]  [<c014186c>] sys_init_module+0x163/0x221
[   41.024000]  [<c0103135>] sysenter_past_esp+0x56/0x8d
[   41.024000]  [<b7fb0410>] 0xb7fb0410
[   41.024000]  [<c0104017>] show_trace_log_lvl+0x2f/0x45
[   41.024000]  [<c01040ee>] show_stack_log_lvl+0x98/0xb2
[   41.024000]  [<c0104351>] show_registers+0x1eb/0x289
[   41.024000]  [<c0104587>] die+0x134/0x241
[   41.024000]  [<c0385e80>] do_page_fault+0x395/0x620
[   41.024000]  [<c0384401>] error_code+0x39/0x40
[   41.024000]  [<c0184d42>] __lookup_hash+0x9d/0xcc
[   41.024000]  [<c0184e02>] lookup_one_len+0x71/0x86
[   41.024000]  [<c01b51da>] create_dir+0x43/0x23f
[   41.024000]  [<c01b53fc>] sysfs_create_subdir+0x26/0x28
[   41.024000]  [<c01b6c56>] sysfs_create_group+0x77/0x97
[   41.024000]  [<c02903af>] dpm_sysfs_add+0x1e/0x20
[   41.024000]  [<c028f6b3>] device_pm_add+0x64/0x89
[   41.024000]  [<c028930a>] device_add+0x1d9/0x380
[   41.024000]  [<c02894cb>] device_register+0x1a/0x20
[   41.024000]  [<c0289811>] device_create+0xaa/0xc4
[   41.024000]  [<f8a0c472>] snd_register_device+0xcf/0x104 [snd]
[   41.024000]  [<f8abd0c2>] snd_sequencer_device_init+0x4e/0x7c [snd_seq]
[   41.024000]  [<f8abd02f>] alsa_seq_init+0x2f/0x51 [snd_seq]
[   41.024000]  [<c014186c>] sys_init_module+0x163/0x221
[   41.024000]  [<c0103135>] sysenter_past_esp+0x56/0x8d
[   41.024000]  =======================
[   41.024000] Code: 42 fc 89 c3 8b 40 04 0f 18 00 90 3b 55 ec 75 e6 8b 45 f0 83 c4 10 5b 5e 5f 5d c3 89 1c 24 e8 27 e9 ff ff 89 c6 8b 45 0c 8b 78 48 <ac> ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 85 c0 75 bd f6 
[   41.024000] EIP: [<c01b5771>] sysfs_lookup+0x65/0xb0 SS:ESP 0068:f6c35de0
[   41.024000]  


There's only one BUG at each boot, and both alternate for no particular
reason.

The lspci, dmesg and .config  can be found at:
http://fdeweerdt.free.fr/drm_bug/

Any ideas for further investigation?

Thanks,
Frederik

[1] Andrew, could it be possible to put the 'mm.patch' at the very end
or at the very beginning of the patches? It is misleading to have the
kernel change it's name in the middle of a bisection :).

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