Another trace:
Jun 23 07:28:05 lumpi kernel: [ 435.146278] WARNING: at
/build/buildd/linux-2.6.28/lib/kref.c:43 kref_get+0x2d/0x30()
Jun 23 07:28:05 lumpi kernel: [ 435.146282] Modules linked in: tun nls_cp437
nls_utf8 cifs hidp i915 drm binfmt_misc ppdev bridge stp bnep deflate zl
ib_deflate ctr twofish twofish_common camellia serpent blowfish des_generic cbc
aes_x86_64 aes_generic xcbc rmd160 sha256_generic sha1_generic crypto_
null af_key input_polldev btusb lp parport snd_hda_intel snd_pcm_oss
snd_mixer_oss snd_pcm arc4 ecb thinkpad_acpi snd_seq_dummy snd_seq_oss nvram
psmo
use snd_seq_midi snd_rawmidi serio_raw snd_seq_midi_event iwlagn iwlcore
led_class snd_seq snd_timer snd_seq_device iTCO_wdt iTCO_vendor_support mac80
211 snd soundcore cfg80211 snd_page_alloc uvcvideo compat_ioctl32 videodev
v4l1_compat intel_agp video output xfs e1000e
fbcon tileblit font bitblit softcursor
Jun 23 07:28:05 lumpi kernel: [ 435.146397] Pid: 2924, comm: Xorg Tainted: G
W 2.6.28-13-generic #44-Ubuntu
Jun 23 07:28:05 lumpi kernel: [ 435.146401] Call Trace:
Jun 23 07:28:05 lumpi kernel: [ 435.146413] [<ffffffff802509bf>]
warn_on_slowpath+0x5f/0x90
Jun 23 07:28:05 lumpi kernel: [ 435.146422] [<ffffffff805a0fe7>] ?
__sock_recvmsg+0x77/0x90
Jun 23 07:28:05 lumpi kernel: [ 435.146430] [<ffffffff802e320a>] ?
__kmalloc+0xba/0x110
Jun 23 07:28:05 lumpi kernel: [ 435.146437] [<ffffffff80419abd>]
kref_get+0x2d/0x30
Jun 23 07:28:05 lumpi kernel: [ 435.146462] [<ffffffffa0439fa2>]
drm_gem_object_lookup+0x42/0x60 [drm]
Jun 23 07:28:05 lumpi kernel: [ 435.146477] [<ffffffffa045d341>]
i915_gem_execbuffer+0x101/0x750 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.146498] [<ffffffffa04387fa>]
drm_ioctl+0x10a/0x330 [drm]
Jun 23 07:28:05 lumpi kernel: [ 435.146512] [<ffffffffa045d240>] ?
i915_gem_execbuffer+0x0/0x750 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.146520] [<ffffffff802f631d>]
vfs_ioctl+0x7d/0xa0
Jun 23 07:28:05 lumpi kernel: [ 435.146527] [<ffffffff802f6685>]
do_vfs_ioctl+0x75/0x230
Jun 23 07:28:05 lumpi kernel: [ 435.146534] [<ffffffff802f68d9>]
sys_ioctl+0x99/0xa0
Jun 23 07:28:05 lumpi kernel: [ 435.146541] [<ffffffff802e82a0>] ?
sys_read+0x50/0x90
Jun 23 07:28:05 lumpi kernel: [ 435.146548] [<ffffffff8021253a>]
system_call_fastpath+0x16/0x1b
Jun 23 07:28:05 lumpi kernel: [ 435.146553] ---[ end trace 0d0e9eafb9df1a40
]---
Jun 23 07:28:05 lumpi kernel: [ 435.153908] BUG: unable to handle kernel NULL
pointer dereference at 0000000000000028
Jun 23 07:28:05 lumpi kernel: [ 435.153921] IP: [<ffffffffa045afbf>]
i915_gem_retire_requests+0x7f/0x170 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.153941] PGD 139059067 PUD 139058067 PMD 0
Jun 23 07:28:05 lumpi kernel: [ 435.153950] Oops: 0000 [#1] SMP
Jun 23 07:28:05 lumpi kernel: [ 435.153957] last sysfs file:
/sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda4/stat
Jun 23 07:28:05 lumpi kernel: [ 435.153965] Dumping ftrace buffer:
Jun 23 07:28:05 lumpi kernel: [ 435.153971] (ftrace buffer empty)
Jun 23 07:28:05 lumpi kernel: [ 435.153975] CPU 1
Jun 23 07:28:05 lumpi kernel: [ 435.153979] Modules linked in: tun nls_cp437
nls_utf8 cifs hidp i915 drm binfmt_misc ppdev bridge stp bnep deflate
zlib_deflate ctr twofish twofish_common camellia serpent blowfish des_generic
cbc aes_x86_64 aes_generic xcbc rmd160 sha256_generic sha1_generic crypto_null
af_key input_polldev btusb lp parport snd_hda_intel snd_pcm_oss snd_mixer_oss
snd_pcm arc4 ecb thinkpad_acpi snd_seq_dummy snd_seq_oss nvram psmouse
snd_seq_midi snd_rawmidi serio_raw snd_seq_midi_event iwlagn iwlcore led_class
snd_seq snd_timer snd_seq_device iTCO_wdt iTCO_vendor_support mac80211 snd
soundcore cfg80211 snd_page_alloc uvcvideo compat_ioctl32 videodev v4l1_compat
intel_agp video output xfs e1000e fbcon tileblit font bitblit softcursor
Jun 23 07:28:05 lumpi kernel: [ 435.154113] Pid: 2924, comm: Xorg Tainted: G
W 2.6.28-13-generic #44-Ubuntu
Jun 23 07:28:05 lumpi kernel: [ 435.154118] RIP: 0010:[<ffffffffa045afbf>]
[<ffffffffa045afbf>] i915_gem_retire_requests+0x7f/0x170 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.154135] RSP: 0018:ffff8801388b5d78
EFLAGS: 00010246
Jun 23 07:28:05 lumpi kernel: [ 435.154140] RAX: 000000000002309f RBX:
ffff88011ac16440 RCX: ffff880133850df0
Jun 23 07:28:05 lumpi kernel: [ 435.154145] RDX: 0000000000000000 RSI:
ffffffffa0439d10 RDI: 0000000000000000
Jun 23 07:28:05 lumpi kernel: [ 435.154150] RBP: ffff8801388b5db8 R08:
ffff880139854000 R09: 0000000000000001
Jun 23 07:28:05 lumpi kernel: [ 435.154155] R10: 0000000000000000 R11:
0000000000003246 R12: ffff880139854000
Jun 23 07:28:05 lumpi kernel: [ 435.154160] R13: ffff880139854000 R14:
ffff880139854eb8 R15: 000000000002309f
Jun 23 07:28:05 lumpi kernel: [ 435.154166] FS: 00007f742eae2700(0000)
GS:ffff88013b802d80(0000) knlGS:0000000000000000
Jun 23 07:28:05 lumpi kernel: [ 435.154172] CS: 0010 DS: 0000 ES: 0000 CR0:
000000008005003b
Jun 23 07:28:05 lumpi kernel: [ 435.154176] CR2: 0000000000000028 CR3:
000000013908a000 CR4: 00000000000006a0
Jun 23 07:28:05 lumpi kernel: [ 435.154181] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Jun 23 07:28:05 lumpi kernel: [ 435.154186] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Jun 23 07:28:05 lumpi kernel: [ 435.154192] Process Xorg (pid: 2924,
threadinfo ffff8801388b4000, task ffff8801379b1660)
Jun 23 07:28:05 lumpi kernel: [ 435.154197] Stack:
Jun 23 07:28:05 lumpi kernel: [ 435.154200] ffff8801379b1660 ffff8801339e0000
ffff880139854ee8 0000000000000000
Jun 23 07:28:05 lumpi kernel: [ 435.154210] ffff880139854000 ffff8801339e0000
000000000002309f 0000000000006458
Jun 23 07:28:05 lumpi kernel: [ 435.154220] ffff8801388b5e28 ffffffffa045b160
ffff88012b1d7e40 0000000000000001
Jun 23 07:28:05 lumpi kernel: [ 435.154232] Call Trace:
Jun 23 07:28:05 lumpi kernel: [ 435.154235] [<ffffffffa045b160>]
i915_wait_request+0xb0/0x1d0 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.154250] [<ffffffffa045b2fd>]
i915_gem_throttle_ioctl+0x3d/0x60 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.154265] [<ffffffffa04387fa>]
drm_ioctl+0x10a/0x330 [drm]
Jun 23 07:28:05 lumpi kernel: [ 435.154289] [<ffffffff8026b650>] ?
__remove_hrtimer+0x40/0xc0
Jun 23 07:28:05 lumpi kernel: [ 435.154299] [<ffffffff802f631d>]
vfs_ioctl+0x7d/0xa0
Jun 23 07:28:05 lumpi kernel: [ 435.154308] [<ffffffff802f6685>]
do_vfs_ioctl+0x75/0x230
Jun 23 07:28:05 lumpi kernel: [ 435.154316] [<ffffffff802f68d9>]
sys_ioctl+0x99/0xa0
Jun 23 07:28:05 lumpi kernel: [ 435.154324] [<ffffffff8021253a>]
system_call_fastpath+0x16/0x1b
Jun 23 07:28:05 lumpi kernel: [ 435.154332] Code: 48 8b 45 c8 4c 8b a0 e0 03
00 00 4d 8d b4 24 b8 0e 00 00 49 8b 84 24 b8 0e 00 00 49 39 c6 74 79 48 8b 78
f0 8b 40 34 3b 03 75 6e <8b> 47 28 85 c0 0f 84 ae 00 00 00 48 8b 77 38 48 8b 47
08 44 8b
Jun 23 07:28:05 lumpi kernel: [ 435.154421] RIP [<ffffffffa045afbf>]
i915_gem_retire_requests+0x7f/0x170 [i915]
Jun 23 07:28:05 lumpi kernel: [ 435.154436] RSP <ffff8801388b5d78>
Jun 23 07:28:05 lumpi kernel: [ 435.154441] CR2: 0000000000000028
Jun 23 07:28:05 lumpi kernel: [ 435.154446] ---[ end trace 0d0e9eafb9df1a40
]---
--
many NULL pointer derefences, random hangs, segfaults
https://bugs.launchpad.net/bugs/362133
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