Public bug reported:

Using the Ubuntu Gutsy amd64 version (on a single core Athlon64 3000+), an ati 
radeon 9200 (128MB) (using the opensource driver) and an Asus k8v-x motherboard 
during last days I've experienced more than one crash: the Xserver freezes and 
in seconds restarts, bringing me back to GDM screen.
Syslog reports this issue:

[ 1323.558390] Unable to handle kernel paging request at ffffffffffffffff RIP: 
[ 1323.558397]  [<ffffffffffffffff>]
[ 1323.558404] PGD 203067 PUD 100c067 PMD 0 
[ 1323.558408] Oops: 0010 [1] SMP 
[ 1323.558411] CPU 0 
[ 1323.558413] Modules linked in: snd_rtctimer tun binfmt_misc radeon drm 
rfcomm l2cap bluetooth af_packet xt_tcpudp xt_length ipt_ttl xt_tcpmss 
xt_TCPMSS iptable_mangle iptable_filter xt_multiport xt_limit ipt_tos 
ipt_REJECT ip_tables x_tables vboxdrv ppdev powernow_k8 cpufreq_stats 
cpufreq_powersave cpufreq_ondemand freq_table cpufreq_userspace 
cpufreq_conservative video ac dock sbs button container battery sbp2 lp loop 
ipv6 snd_via82xx gameport snd_pcm_oss snd_via82xx_modem snd_ac97_codec 
snd_mixer_oss ac97_bus snd_seq_dummy snd_seq_oss usbhid snd_pcm snd_mpu401_uart 
hid snd_seq_midi snd_seq_midi_event acx psmouse snd_rawmidi snd_seq snd_timer 
snd_seq_device pcspkr parport_pc parport k8temp serio_raw i2c_viapro snd 
soundcore snd_page_alloc i2c_core shpchp pci_hotplug evdev ext3 jbd mbcache 
ide_cd cdrom ide_disk via82cxxx ide_core ehci_hcd uhci_hcd usbcore ata_generic 
sata_via libata scsi_mod ohci1394 ieee1394 skge thermal processor fan fuse 
apparmor commoncap
[ 1323.558453] Pid: 5293, comm: Xorg Not tainted 2.6.22-14-generic #1
[ 1323.558456] RIP: 0010:[<ffffffffffffffff>]  [<ffffffffffffffff>]
[ 1323.558460] RSP: 0018:ffff810044517ed0  EFLAGS: 00010286
[ 1323.558464] RAX: ffffffff88581da0 RBX: ffff810045ff2d00 RCX: ffffffffffffffff
[ 1323.558468] RDX: 00007fff7794c200 RSI: 00000000c0406429 RDI: ffff810045ff2d00
[ 1323.558471] RBP: 00007fff7794c200 R08: 0000000003b15e20 R09: 00000000ec2aa000
[ 1323.558475] R10: ffece8e4ffeeeae7 R11: 0000000000003246 R12: 00007fff7794c200
[ 1323.558478] R13: 00000000c0406429 R14: 00000000c0406429 R15: 0000000001174f10
[ 1323.558482] FS:  00002b0234877e20(0000) GS:ffffffff80560000(0000) 
knlGS:00000000f74976c0
[ 1323.558484] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1323.558488] CR2: ffffffffffffffff CR3: 0000000044458000 CR4: 00000000000006e0
[ 1323.558491] Process Xorg (pid: 5293, threadinfo ffff810044516000, task 
ffff8100444ef4a0)
[ 1323.558493] Stack:  ffffffff802a6e05 000000000413c984 ffff810045ff2d00 
00007fff7794c200
[ 1323.558499]  0000000000000008 0000000000000008 ffffffff802a6f24 
0000000000a72730
[ 1323.558504]  ffff8100010141e8 0000000000000000 ffff810045ff2d00 
00007fff7794c200
[ 1323.558507] Call Trace:
[ 1323.558513]  [<ffffffff802a6e05>] do_ioctl+0x35/0xe0
[ 1323.558520]  [<ffffffff802a6f24>] vfs_ioctl+0x74/0x2d0
[ 1323.558528]  [<ffffffff802a7215>] sys_ioctl+0x95/0xb0
[ 1323.558536]  [<ffffffff80209e8e>] system_call+0x7e/0x83
[ 1323.558547] 
[ 1323.558548] 
[ 1323.558549] Code:  Bad RIP value.
[ 1323.558552] RIP  [<ffffffffffffffff>]
[ 1323.558555]  RSP <ffff810044517ed0>
[ 1323.558558] CR2: ffffffffffffffff
[ 1325.690437] agpgart: Found an AGP 3.5 compliant device at 0000:00:00.0.
[ 1325.690518] agpgart: Putting AGP V3 device at 0000:00:00.0 into 8x mode
[ 1325.690616] agpgart: Putting AGP V3 device at 0000:01:00.0 into 8x mode
[ 1325.883588] [drm] Setting GART location based on new memory map
[ 1325.883595] [drm] Loading R200 Microcode
[ 1325.883630] [drm] writeback test succeeded in 1 usecs

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Xorg crashes unexpectedly (amd64, gutsy, compiz)
https://bugs.launchpad.net/bugs/160688
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