Oh well spoke too soon:
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980058] ------------[ cut here
]------------
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980068] WARNING: at
/build/buildd/linux-2.6.31/lib/kref.c:43 kref_get+0x2d/0x30()
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980070] Hardware name: OptiPlex 745
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980072] Modules linked in:
binfmt_misc vboxnetflt vboxnetadp vboxdrv kvm_intel kvm snd_hda_codec_analog
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_dummy snd_seq_oss ppdev iptable_filter snd_seq_midi ip_tables x_tables
gspca_zc3xx gspca_main videodev v4l1_compat v4l2_compat_ioctl32 pl2303
usbserial snd_rawmidi snd_seq_midi_event psmouse serio_raw parport_pc dell_wmi
dcdbas lp parport snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc
usbhid dm_raid45 xor fbcon tileblit font bitblit softcursor radeon ttm drm
i2c_algo_bit floppy tg3 intel_agp
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980114] Pid: 10, comm: events/1 Not
tainted 2.6.31-18-generic #55-Ubuntu
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980116] Call Trace:
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980121] [<ffffffff8105e828>]
warn_slowpath_common+0x78/0xb0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980125] [<ffffffff8105e86f>]
warn_slowpath_null+0xf/0x20
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980127] [<ffffffff81279bed>]
kref_get+0x2d/0x30
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980135] [<ffffffffa007fdf4>]
ttm_bo_delayed_delete+0x94/0x180 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980141] [<ffffffffa007fee0>] ?
ttm_bo_delayed_workqueue+0x0/0x40 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980146] [<ffffffffa007fefa>]
ttm_bo_delayed_workqueue+0x1a/0x40 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980150] [<ffffffff81073865>]
run_workqueue+0x95/0x170
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980153] [<ffffffff810739e4>]
worker_thread+0xa4/0x120
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980156] [<ffffffff81078b90>] ?
autoremove_wake_function+0x0/0x40
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980159] [<ffffffff81073940>] ?
worker_thread+0x0/0x120
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980162] [<ffffffff810787a6>]
kthread+0xa6/0xb0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980165] [<ffffffff8101312a>]
child_rip+0xa/0x20
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980168] [<ffffffff81078700>] ?
kthread+0x0/0xb0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980170] [<ffffffff81013120>] ?
child_rip+0x0/0x20
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980172] ---[ end trace
c31a867b7006f62a ]---
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980238] CPU 0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980240] Modules linked in:
binfmt_misc vboxnetflt vboxnetadp vboxdrv kvm_intel kvm snd_hda_codec_analog
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm
snd_seq_dummy snd_seq_oss ppdev iptable_filter snd_seq_midi ip_tables x_tables
gspca_zc3xx gspca_main videodev v4l1_compat v4l2_compat_ioctl32 pl2303
usbserial snd_rawmidi snd_seq_midi_event psmouse serio_raw parport_pc dell_wmi
dcdbas lp parport snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc
usbhid dm_raid45 xor fbcon tileblit font bitblit softcursor radeon ttm drm
i2c_algo_bit floppy tg3 intel_agp
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980275] Pid: 9, comm: events/0
Tainted: G W 2.6.31-18-generic #55-Ubuntu OptiPlex 745
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980277] RIP:
0010:[<ffffffff81114b3c>] [<ffffffff81114b3c>] kfree+0x12c/0x140
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980283] RSP: 0018:ffff880137a91d10
EFLAGS: 00010246
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980285] RAX: 0100000000000000 RBX:
ffffffffa00b35d3 RCX: ffff8800aed00128
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980287] RDX: 0000000000576cb8 RSI:
ffffea000263f908 RDI: ffff8800aed97e00
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980289] RBP: ffff880137a91d30 R08:
0000000000000000 R09: 0000000000000000
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980291] R10: 0000000000000594 R11:
0000000000000000 R12: ffff8800aed97e00
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980293] R13: ffff8800aed97e3c R14:
ffff8800aed97e3c R15: ffff880134c3f7a8
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980295] FS: 0000000000000000(0000)
GS:ffff880028022000(0000) knlGS:0000000000000000
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980297] CS: 0010 DS: 0018 ES: 0018
CR0: 000000008005003b
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980299] CR2: 00007f7b37a18000 CR3:
000000011fd3f000 CR4: 00000000000026f0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980301] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980303] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980306] Process events/0 (pid: 9,
threadinfo ffff880137a90000, task ffff880137a85ac0)
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980309] ffff880134c3f4a0
ffff8800aed97e00 ffff880134c3f330 ffff8800aed97e3c
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980312] <0> ffff880137a91d50
ffffffffa00b35d3 ffff880137a91da0 ffff8800aed97e00
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980316] <0> ffff880137a91d80
ffffffffa007ec6a ffff88011ec2c410 ffff8800aed97e3c
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980339] [<ffffffffa00b35d3>]
radeon_ttm_object_object_destroy+0x43/0x50 [radeon]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980346] [<ffffffffa007ec6a>]
ttm_bo_release_list+0x8a/0xe0 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980351] [<ffffffffa007ebe0>] ?
ttm_bo_release_list+0x0/0xe0 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980354] [<ffffffff81279b87>]
kref_put+0x37/0x70
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980359] [<ffffffffa007fe27>]
ttm_bo_delayed_delete+0xc7/0x180 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980364] [<ffffffffa007fee0>] ?
ttm_bo_delayed_workqueue+0x0/0x40 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980369] [<ffffffffa007fefa>]
ttm_bo_delayed_workqueue+0x1a/0x40 [ttm]
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980373] [<ffffffff81073865>]
run_workqueue+0x95/0x170
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980375] [<ffffffff810739e4>]
worker_thread+0xa4/0x120
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980378] [<ffffffff81078b90>] ?
autoremove_wake_function+0x0/0x40
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980381] [<ffffffff81073940>] ?
worker_thread+0x0/0x120
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980384] [<ffffffff810787a6>]
kthread+0xa6/0xb0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980387] [<ffffffff8101312a>]
child_rip+0xa/0x20
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980390] [<ffffffff81078700>] ?
kthread+0x0/0xb0
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980392] [<ffffffff81013120>] ?
child_rip+0x0/0x20
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980428] RSP <ffff880137a91d10>
Jan 27 08:18:07 nsh-ubuntu kernel: [ 263.980430] ---[ end trace
c31a867b7006f62b ]---
Error description has been appended to similar error reported on a newer kernel:
https://bugs.freedesktop.org/show_bug.cgi?id=25079
** Bug watch added: freedesktop.org Bugzilla #25079
https://bugs.freedesktop.org/show_bug.cgi?id=25079
--
2.6.31-12.41 hangs with Radeon KMS
https://bugs.launchpad.net/bugs/446421
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