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SubjectRe: BUG: unable to handle kernel NULL pointer dereference, i915_gem_object_move_to_active
Hi Nils,

Op 05-05-10 00:22, Nils Radtke schreef:
> Hi,
>
> It happens quite often that X crashes for unknown reasons but this time
>
It appears the same is (was) happening to my wifes laptop. But I've
never been able to find a reason for it, nor a BUG or WARN. And the same
logoff and firefox crashes that you mention, although it has Gnome on it
instead of KDE.
That was going on with Ubuntu Karmic installed (using standard Ubuntu
2.6.31 kernel). Yesterday I decided (since she'd be gone for the whole
day) to upgrade to Lucid. I'll have to wait and see whether that still
happens. I have seen already that on some boots the wireless is not
stable (i.e. the connection gets dropped after a few seconds and
re-negotiated), but I guess that's not related.

As for the hw, it's an Acer Aspire 3650: Celeron, ATI SB400, ATI based
graphics (using the radeon driver) and Atheros based wireless (using
ath5k). So it seems that most of the hw differs except for the wireless.

-- Jan Evert

> 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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