Comment 42 for bug 585734

I don't know if this is the same bug. The first excerpt from kern.log didn't lock up the box but 2-3 minutes later X crashed with the bt below:

Jul 1 21:30:38 tanghus kernel: [ 181.155905] virtuoso-t[2154] general protection ip:8429e5c sp:b78831c0 error:0 in virtuoso-t[8048000+88d000]
Jul 1 21:31:44 tanghus kernel: [ 247.572624] BUG: unable to handle kernel paging request at 00100d68
Jul 1 21:31:44 tanghus kernel: [ 247.572639] IP: [<c017fc2a>] module_put+0x1a/0xa0
Jul 1 21:31:44 tanghus kernel: [ 247.572658] *pde = 7e74b067
Jul 1 21:31:44 tanghus kernel: [ 247.572664] Oops: 0000 [#1] SMP
Jul 1 21:31:44 tanghus kernel: [ 247.572672] last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:01:0c.0/local_cpus
Jul 1 21:31:44 tanghus kernel: [ 247.572679] Modules linked in: dm_crypt snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device ppdev dell_wmi dcdbas snd parport_pc soundcore shpchp snd_page_alloc lp parport usbhid hid fbcon tileblit font bitblit softcursor vga16fb vgastate i915 drm_kms_helper drm i2c_algo_bit video intel_agp e1000 output floppy agpgart
Jul 1 21:31:44 tanghus kernel: [ 247.572772]
Jul 1 21:31:44 tanghus kernel: [ 247.572780] Pid: 2123, comm: amarok Not tainted (2.6.32-23-generic #37-Ubuntu) OptiPlex SX270
Jul 1 21:31:44 tanghus kernel: [ 247.572786] EIP: 0060:[<c017fc2a>] EFLAGS: 00210206 CPU: 1
Jul 1 21:31:44 tanghus kernel: [ 247.572795] EIP is at module_put+0x1a/0xa0
Jul 1 21:31:44 tanghus kernel: [ 247.572800] EAX: 00100c0c EBX: 00100c0c ECX: f042a620 EDX: efcd4628
Jul 1 21:31:44 tanghus kernel: [ 247.572806] ESI: 00000008 EDI: efd685d8 EBP: eecf3f44 ESP: eecf3f30
Jul 1 21:31:44 tanghus kernel: [ 247.572811] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Jul 1 21:31:44 tanghus kernel: [ 247.572818] Process amarok (pid: 2123, ti=eecf2000 task=eef88cc0 task.ti=eecf2000)
Jul 1 21:31:44 tanghus kernel: [ 247.572823] Stack:
Jul 1 21:31:44 tanghus kernel: [ 247.572826] eecf3f3c c03216ca eec31a80 00000008 efd685d8 eecf3f74 c0209ddb 00000003
Jul 1 21:31:44 tanghus kernel: [ 247.572844] <0> 00000000 00000000 efcd4628 efd685d8 f7060500 efcd4628 eec31a80 eeaa9400
Jul 1 21:31:44 tanghus kernel: [ 247.572863] <0> ffffffe3 eecf3f7c c0209edd eecf3f94 c02063fc 00200046 eeaa9400 eec31a80
Jul 1 21:31:44 tanghus kernel: [ 247.572883] Call Trace:
Jul 1 21:31:44 tanghus kernel: [ 247.572894] [<c03216ca>] ? apparmor_file_free_security+0x2a/0x30
Jul 1 21:31:44 tanghus kernel: [ 247.572904] [<c0209ddb>] ? __fput+0x10b/0x1f0
Jul 1 21:31:44 tanghus kernel: [ 247.572913] [<c0209edd>] ? fput+0x1d/0x30
Jul 1 21:31:44 tanghus kernel: [ 247.572922] [<c02063fc>] ? filp_close+0x4c/0x80
Jul 1 21:31:44 tanghus kernel: [ 247.572931] [<c02064a5>] ? sys_close+0x75/0xc0
Jul 1 21:31:44 tanghus kernel: [ 247.572940] [<c01033ec>] ? syscall_call+0x7/0xb
Jul 1 21:31:44 tanghus kernel: [ 247.572945] Code: 00 83 c4 04 5b 5e 5f 5d c3 90 8d b4 26 00 00 00 00 55 89 e5 83 ec 14 89 5d f4 89 75 f8 89 7d fc 0f 1f 44 00 00 85 c0 89 c3 74 36 <8b> 80 5c 01 00 00 64 8b 15 40 1a 84 c0 03 04 95 00 ff 79 c0 ff
Jul 1 21:31:44 tanghus kernel: [ 247.573056] EIP: [<c017fc2a>] module_put+0x1a/0xa0 SS:ESP 0068:eecf3f30
Jul 1 21:31:44 tanghus kernel: [ 247.573070] CR2: 0000000000100d68
Jul 1 21:31:44 tanghus kernel: [ 247.573077] ---[ end trace c39245d07c0ce116 ]---
Jul 1 21:38:03 tanghus kernel: [ 625.613848] nepomukservices[2573]: segfault at 7 ip 04b0dca8 sp bfc963d0 error 4 in libsoprano.so.4.3.0[4ac8000+ef000]
Jul 1 21:38:04 tanghus kernel: [ 627.210441] nepomukservices[2952]: segfault at 243c89ff ip 0179bcb3 sp bf88de20 error 6 in libsoprano.so.4.3.0[1756000+ef000]
Jul 1 21:38:05 tanghus kernel: [ 628.381405] nepomukservices[2971]: segfault at 9 ip 01802ca8 sp bfcd2f60 error 4 in libsoprano.so.4.3.0[17bd000+ef000]
Jul 1 21:38:06 tanghus kernel: [ 629.458056] nepomukservices[2977]: segfault at 8 ip 00adfca8 sp bfb060a0 error 4 in libsoprano.so.4.3.0[a9a000+ef000]
Jul 1 21:38:07 tanghus kernel: [ 630.503692] nepomukservices[2983]: segfault at a ip 00d3bca8 sp bfe71e50 error 4 in libsoprano.so.4.3.0[cf6000+ef000]
Jul 1 21:38:09 tanghus kernel: [ 631.748737] nepomukservices[2989]: segfault at 1 ip 007c3604 sp bffe0180 error 4 in libQtCore.so.4.6.3[713000+273000]

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e937b]
1: /usr/bin/X (0x8048000+0x61c7d) [0x80a9c7d]
2: (vdso) (__kernel_rt_sigreturn+0x0) [0x55f410]
3: /lib/libdrm_intel.so.1 (0x15b000+0x5bdb) [0x160bdb]
4: /lib/libdrm_intel.so.1 (drm_intel_bo_unreference+0x16) [0x15c5b6]
5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x13f77) [0x771f77]
6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x4527a) [0x7a327a]
7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x5b6a4) [0x7b96a4]
8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x5d416) [0x7bb416]
9: /usr/bin/X (miCopyRegion+0x21b) [0x819ca8b]
10: /usr/bin/X (miDoCopy+0x44d) [0x819cfad]
11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x5d288) [0x7bb288]
12: /usr/bin/X (0x8048000+0xda973) [0x8122973]
13: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x5fd99) [0x7bdd99]
14: /usr/lib/xorg/modules/drivers/intel_drv.so (0x75e000+0x602df) [0x7be2df]
15: /usr/bin/X (CompositeTrapezoids+0x9e) [0x81138fe]
16: /usr/bin/X (0x8048000+0xd4533) [0x811c533]
17: /usr/bin/X (0x8048000+0xce9d3) [0x81169d3]
18: /usr/bin/X (0x8048000+0x2a477) [0x8072477]
19: /usr/bin/X (0x8048000+0x1ed7a) [0x8066d7a]
20: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0x322bd6]
21: /usr/bin/X (0x8048000+0x1e961) [0x8066961]
Segmentation fault at address 0x4

Caught signal 11 (Segmentation fault). Server aborting