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

    It's been happening here since first kernel on this box, when "the other OS"
    had to leave, approx. end of 2008.

    *ubuntu didn't help either, so far.

    A kernel NULL ptr deref looks like a serious thing, at least to me.
    Unfortunately, I'm not yet that deep into kernel code that I myself
    could do that easily.. Maybe someone more apt in this regard
    can help us out here?

    Cheers,

    Nils

    On mer 2010-05-05 @ 11-46-11 +0200, Jan Evert van Grootheest (SDG) wrote:
    # 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
    # >
    # >--
    # >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    # >the body of a message to majordomo@vger.kernel.org
    # >More majordomo info at http://vger.kernel.org/majordomo-info.html
    # >Please read the FAQ at http://www.tux.org/lkml/
    # >
    # >
    #

    --


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