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SubjectBUG: unable to handle kernel NULL pointer dereference, i915_gem_object_move_to_active
  Hi,

It happens quite often that X crashes for unknown reasons but this time
there it's left us a note, this BUG:

BUG: unable to handle kernel NULL pointer dereference at 000001e4
IP: [<c134ddbc>] i915_gem_object_move_to_active+0x1c/0xa0
*pde = 00000000
Oops: 0000 [#4] PREEMPT
last sysfs file: /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/net/wlan0/wireless/link
Modules linked in: wlan_scan_sta ath_rate_sample ath_pci ath_hal option usbserial usb_storage snd_usb_audio snd_usb_lib snd_seq_midi snd_rawmidi uvcvideo wlan_ccmp video1394 raw1394 dv1394 firewire_ohci firewire_core wlan ohci1394 tg3 libphy ieee1394 [last unloaded: ath_hal]
Pid: 3328, comm: Xorg Tainted: G D 2.6.33 #1 Columbia /Extensa 5220
EIP: 0060:[<c134ddbc>] EFLAGS: 00213282 CPU: 0
EIP is at i915_gem_object_move_to_active+0x1c/0xa0
EAX: 00000000 EBX: c6679450 ECX: c679fd50 EDX: 00b10a13
ESI: 00000000 EDI: 00000000 EBP: 00b10a13 ESP: f51c1cb0
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process Xorg (pid: 3328, ti=f51c0000 task=f6be5bf0 task.ti=f51c0000)
Stack:
c6679450 00000004 00000000 c679fd50 c134e83f 00000002 c17d42ab c16e3b29
<0> c17d71ee 00b10a13 00000004 f7395800 f7318000 f7318e10 c1326450 f7318df8
<0> f6baff20 00b10a13 f7318de8 f7318e10 f7318000 00000004 00000001 f7395800
Call Trace:
[<c134e83f>] ? i915_add_request+0x25f/0x370
[<c1326450>] ? agp_flush_chipset+0x10/0x20
[<c1352d55>] ? i915_gem_do_execbuffer+0x1325/0x13a0
[<c102e087>] ? check_preempt_wakeup+0x87/0x160
[<c13530ae>] ? i915_gem_execbuffer+0xee/0x4b0
[<c13531fb>] ? i915_gem_execbuffer+0x23b/0x4b0
[<c1334056>] ? drm_ioctl+0x186/0x380
[<c1352fc0>] ? i915_gem_execbuffer+0x0/0x4b0
[<c10d79dd>] ? do_sync_read+0xad/0xf0
[<c1333ed0>] ? drm_ioctl+0x0/0x380
[<c10e5fcb>] ? vfs_ioctl+0x2b/0xa0
[<c10e61a3>] ? do_vfs_ioctl+0x73/0x5f0
[<c1038229>] ? do_setitimer+0xd9/0x220
[<c1058a93>] ? ktime_get_ts+0xe3/0x100
[<c104e1e0>] ? posix_ktime_get_ts+0x0/0x10
[<c10e6786>] ? sys_ioctl+0x66/0x70
[<c1002c8c>] ? sysenter_do_call+0x12/0x22
Code: 8a 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 83 ec 10 89 c1 89 6c 24 0c 89 d5 89 1c 24 89 74 24 04 89 7c 24 08 8b 40 08 8b 71 50 <8b> b8 e4 01 00 00 8b 46 20 85 c0 74 5f 89 e1 81 e1 00 e0 ff ff
EIP: [<c134ddbc>] i915_gem_object_move_to_active+0x1c/0xa0 SS:ESP 0068:f51c1cb0
CR2: 00000000000001e4
---[ end trace 13931f32db9a26c3 ]---

- Is there any particular meaning for "last sysfs file" shown? I mean, could there
be some link between the crash and "last sysfs file"?

- X crashing happens actually a lot on this specific notebook. If it's not X crashing,
then unmotivated kde log-offs or frequent firefox crashes contribute their share.
It's most probably not faulty RAM, it's new, it's been tested thoroughly.


Thanks for some answers,

Nils



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