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Xorg crashes on my laptop (Toshiba L30-105) with a ATI readon Express
card I think. Happend 2 times already:

johan-Satellite-L30 kernel: [ 1049.198866] BUG: unable to handle kernel NULL pointer dereference at 00000020
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.199096] IP: [<c141ed21>] sock_poll+0x11/0x20
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.199181] *pde = 23f9e067 *pte = 00000000 
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.199267] Oops: 0000 [#1] SMP 
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.199340] last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.199415] Modules linked in: binfmt_misc parport_pc ppdev snd_hda_codec_realtek arc4 radeon snd_hda_intel snd_hda_codec ath5k ath snd_hwdep mac80211 joydev snd_pcm ttm drm_kms_helper drm snd_seq_midi pcmcia cfg80211 snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd yenta_socket i2c_algo_bit pcmcia_rsrc soundcore shpchp pcmcia_core psmouse snd_page_alloc ati_agp sparse_keymap i2c_piix4 serio_raw video lp parport usbhid 8139too hid 8139cp sata_sil pata_atiixp
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.200762] 
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.200822] Pid: 1056, comm: Xorg Not tainted 2.6.38-11-generic #50-Ubuntu TOSHIBA Satellite L30/Satellite L30
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201044] EIP: 0060:[<c141ed21>] EFLAGS: 00213246 CPU: 0
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201123] EIP is at sock_poll+0x11/0x20
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201171] EAX: e3c9f780 EBX: 00000000 ECX: e2ec5bd4 EDX: e34268c0
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201269] ESI: 00040000 EDI: e3c9f780 EBP: e2ec5b54 ESP: e2ec5b50
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201339]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201425] Process Xorg (pid: 1056, ti=e2ec4000 task=f4575860 task.ti=e2ec4000)
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201520] Stack:
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201564]  00000012 e2ec5e48 c1137c73 f6475460 00000001 f5c07324 01475460 f4575860
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684]  0130a05b e2ec5fa0 e2ec5bd4 00000000 00000000 e2ec5f04 e2ec5ee4 e2ec5ec4
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684]  e2ec5f64 e2ec5ea4 e2ec5e84 e2ec5e64 00000000 00000000 00000000 00000000
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684] Call Trace:
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684]  [<c1137c73>] do_select+0x283/0x550
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684]  [<c1137540>] ? __pollwait+0x0/0xd0
Sep 26 17:40:17 johan-Satellite-L30 kernel: [ 1049.201684]  [<c1137610>] ? pollwake+0x0/0x60

I can provide more info if needed. (I do not exactly know what to get
and where)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Xorg crashes suddenly
https://bugs.launchpad.net/bugs/859753
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