[Intel-gfx] Linux 2.6.37-2, 2.14.0-4: BUG: unable to handle kernel NULL pointer dereference at 00000100; IP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915]

Tue Mar 15 10:35:53 CET 2011

Dear Intel driver folks,

using Debian Sid/unstable with

        linux-image-2.6.37-2-686 2.6.37-2 [1]
        xserver-xorg-video-intel 2:2.14.0-4 [2]

I noticed the following Linux kernel Oops today when shutting down the
system.

        Mar 15 03:43:23 hostname kernel: [ 1189.189626] BUG: unable to handle kernel NULL pointer dereference at 00000100
        Mar 15 03:43:23 hostname kernel: [ 1189.189821] IP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915]
        Mar 15 03:43:23 hostname kernel: [ 1189.190020] *pde = 00000000 
        Mar 15 03:43:23 hostname kernel: [ 1189.190104] Oops: 0000 [#1] SMP 
        Mar 15 03:43:23 hostname kernel: [ 1189.190209] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-SVIDEO-1/status
        Mar 15 03:43:23 hostname kernel: [ 1189.190412] Modules linked in: mperf cpufreq_conservative cpufreq_userspace cpufreq_powersave cpufreq_stats decnet uinput fuse loop joydev snd_hd
        a_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm i915 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq drm_kms_helper snd_timer uvcvideo d
        rm snd_seq_device eeepc_laptop tpm_tis usbhid videodev i2c_algo_bit v4l1_compat snd sparse_keymap i2c_core hid serio_raw tpm psmouse evdev tpm_bios rfkill shpchp ac processor rng_c
        ore battery video power_supply soundcore pci_hotplug button output snd_page_alloc usb_storage uas ext3 jbd mbcache sd_mod crc_t10dif ata_generic ahci libahci ata_piix libata uhci_h
        cd ehci_hcd scsi_mod usbcore thermal atl2 thermal_sys nls_base [last unloaded: scsi_wait_scan]
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] 
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] Pid: 1464, comm: upowerd Not tainted 2.6.37-2-686 #1 ASUSTeK Computer INC. 701/701
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] EIP: 0060:[<e0c22019>] EFLAGS: 00010246 CPU: 0
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] EIP is at intel_tv_detect_type+0xa2/0x203 [i915]
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] EAX: 00000000 EBX: dca74000 ECX: e0f68004 EDX: 00068004
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] ESI: dd110c00 EDI: 400c0c37 EBP: dca7429c ESP: de365e2c
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] Process upowerd (pid: 1464, ti=de364000 task=dcc8acb0 task.ti=de364000)
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] Stack:
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  e0c2cda4 70000000 400c0c30 00000000 dd111000 de365e54 de365f24 dd110c00
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  e0c22203 01000000 00000003 00000000 00000000 00000000 00000000 4353544e
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  30383420 00000069 00000000 00000000 00000000 00000000 00000000 00000000
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] Call Trace:
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<e0c22203>] ? intel_tv_detect+0x89/0x12d [i915]
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<e0a9dcef>] ? status_show+0x0/0x2f [drm]
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<e0a9dd03>] ? status_show+0x14/0x2f [drm]
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c11c390a>] ? dev_attr_show+0x16/0x32
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c10fc020>] ? sysfs_read_file+0x8c/0xf5
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c10fbf94>] ? sysfs_read_file+0x0/0xf5
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c10ba3aa>] ? vfs_read+0x7c/0xd6
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c10b8a34>] ? do_sys_open+0xb5/0xbe
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c10ba497>] ? sys_read+0x3c/0x60
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c1002f9f>] ? sysenter_do_call+0x12/0x28
        Mar 15 03:43:23 hostname kernel: [ 1189.192007]  [<c1280000>] ? init_scattered_cpuid_features+0x31/0xb6
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] Code: d8 e8 30 f8 ff ff ba 04 80 06 00 89 d8 8b 4c 24 0c 81 c9 aa 00 00 0f e8 1a f8 ff ff ba 04 80 06 00 89 d8 e8 ea f7 ff ff 8b 46 20 <8b> 90 00 01 00 00 8b 06 e8 40 11 ff ff b8 14 00 00 00 8b 35 40 
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] EIP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915] SS:ESP 0068:de365e2c
        Mar 15 03:43:23 hostname kernel: [ 1189.192007] CR2: 0000000000000100
        Mar 15 03:43:23 hostname kernel: [ 1189.267928] ---[ end trace 7063a9f77f1a7591 ]---

I cannot reproduce this though, but there seem to be another report for
Ubuntu Natty 11.04 too [3] and there the reporter says that his graphic
does not work after this has happened. I cannot comment on this, since I
was shutting the system down.

Can you make something out of this or what else do you need for
debugging? It will be hard though, since I have not yet figured out how
to reproduce this and according to `/var/log/syslog` this is the only
Oops there has been in the last months.

Thanks,

Paul

[1] http://packages.debian.org/sid/linux-image-2.6.37-2-686
[2] http://packages.debian.org/sid/xserver-xorg-video-intel
[3] http://forum.ubuntuusers.de/topic/intel-grafiktreiber-kernelbug/#post-2807223
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