linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference (drm

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Message-ID: <873ansbwcq.fsf@saeurebad.de>
Date:	Thu, 05 Jun 2008 01:42:45 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer dereference (drm_getunique)

Hi,

Sitsofe Wheeler <sitsofe@...oo.com> writes:

> While flipping back and forth between the vts/Xorg and doing iperf test
> over the wifi connection the following error appeared in next-20080604.
>
> [ 4305.767435] BUG: unable to handle kernel NULL pointer dereference at 00000000
> [ 4305.767452] IP: [<c02511d4>] drm_getunique+0xc/0x30
> [ 4305.767466] *pde = 00000000
> [ 4305.767474] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
> [ 4305.767483] last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map
> [ 4305.767492] Modules linked in:
> [ 4305.767498]
> [ 4305.767503] Pid: 8373, comm: unix2_chkpwd Tainted: G        W (2.6.26-rc4-next-20080604skw #177)

There was a warning before that oops already, could you post that too?

> [ 4305.767513] EIP: 0060:[<c02511d4>] EFLAGS: 00210246 CPU: 0
> [ 4305.767521] EIP is at drm_getunique+0xc/0x30
> [ 4305.767527] EAX: f7d8ea70 EBX: 00000000 ECX: 00000028 EDX: 00000000
> [ 4305.767535] ESI: f7d8ea70 EDI: 00005401 EBP: ed383f34 ESP: ed383f2c
> [ 4305.767543]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [ 4305.767550] Process unix2_chkpwd (pid: 8373, ti=ed382000 task=f6efdee0 task.ti=ed382000)
> [ 4305.767558] Stack: 00000000 c04940a4 ed383f58 c0250637 f1e03f50 f7d8ea70 f7d8eaf0 c02511c8
> [ 4305.767574]        c04944c4 d603b200 bfda0500 ed383f74 c017ebba bfda0500 00005401 d603b200
> [ 4305.767589]        d603b200 bfda0500 ed383f98 c017ee0a 00000001 ffffffea f1c0c100 ed383fb0
> [ 4305.767605] Call Trace:
> [ 4305.767611]  [<c0250637>] ? drm_ioctl+0x1b0/0x225
> [ 4305.767622]  [<c02511c8>] ? drm_getunique+0x0/0x30
> [ 4305.767632]  [<c017ebba>] ? vfs_ioctl+0x4e/0x67
> [ 4305.767643]  [<c017ee0a>] ? do_vfs_ioctl+0x237/0x245
> [ 4305.767652]  [<c017ee44>] ? sys_ioctl+0x2c/0x48
> [ 4305.767661]  [<c0102c35>] ? sysenter_past_esp+0x6a/0xa5
> [ 4305.767672]  =======================
> [ 4305.767678] Code: 0f 18 01 90 8d 42 18 39 d8 75 c0 8b 45 ec e8 fa e4 11 00 b8 ea ff ff ff 59 5b 5b 5e 5f 5d c3 55 89 e5 56 89 c6 53 8b 48 04 89 d3 <39> 0a 72 13 8b 42 04 8b 16 e8 a1 df f9 ff ba f2 ff ff ff 85 c0
> [ 4305.767747] EIP: [<c02511d4>] drm_getunique+0xc/0x30 SS:ESP 0068:ed383f2c
> [ 4305.770317] ---[ end trace 032f7186de7f2687 ]---

	Hannes
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