Comment 4 for bug 533784

Confirmed here. It was a lot more stable before -- but after I upgraded my radeon driver and xorg-server (and possibly the kernel), it crashes pretty much every time I play q3 (urbanterror), usually within a few minutes.

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X700 (PCIE)
xf86-video-ati-6.12.4
mesa-7.5.2
libdrm-2.4.15
kernel 2.6.32-rc6

[drm] Num pipes: 2
urbanterror: page allocation failure. order:4, mode:0x40d0
Pid: 15033, comm: urbanterror Not tainted 2.6.32-rc6 #1
Call Trace:
 [<ffffffff81072846>] ? __alloc_pages_nodemask+0x576/0x650
 [<ffffffff81072932>] ? __get_free_pages+0x12/0x60
 [<ffffffff81227aa8>] ? radeon_cp_cmdbuf+0x1eb8/0x2250
 [<ffffffff81030540>] ? default_wake_function+0x0/0x10
 [<ffffffff8122a155>] ? radeon_mem_alloc+0x125/0x240
 [<ffffffff812033a3>] ? drm_ioctl+0x173/0x3b0
 [<ffffffff81225bf0>] ? radeon_cp_cmdbuf+0x0/0x2250
 [<ffffffff81049960>] ? autoremove_wake_function+0x0/0x30
 [<ffffffff810ad63d>] ? vfs_ioctl+0x7d/0xa0
 [<ffffffff810adb10>] ? do_vfs_ioctl+0x410/0x5b0
 [<ffffffff810adcf9>] ? sys_ioctl+0x49/0x80
 [<ffffffff8100b1a8>] ? system_call_fastpath+0x16/0x1b
Mem-Info:
DMA per-cpu:
CPU 0: hi: 0, btch: 1 usd: 0
DMA32 per-cpu:
CPU 0: hi: 186, btch: 31 usd: 0
active_anon:47218 inactive_anon:47285 isolated_anon:0
 active_file:2111 inactive_file:3254 isolated_file:0
 unevictable:1 dirty:14 writeback:0 unstable:0
 free:1469 slab_reclaimable:1516 slab_unreclaimable:1817
 mapped:6172 shmem:2606 pagetables:970 bounce:0
DMA free:2056kB min:84kB low:104kB high:124kB active_anon:5520kB inactive_anon:5604kB active_file:708kB inactive_fi
le:1292kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15372kB mlocked:0kB dirty:4kB writeback:0kB
 mapped:184kB shmem:0kB slab_reclaimable:420kB slab_unreclaimable:96kB kernel_stack:0kB pagetables:12kB unstable:0k
B bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 488 488 488
DMA32 free:3820kB min:2780kB low:3472kB high:4168kB active_anon:183352kB inactive_anon:183536kB active_file:7736kB
inactive_file:11724kB unevictable:4kB isolated(anon):0kB isolated(file):0kB present:499884kB mlocked:4kB dirty:52kB
 writeback:0kB mapped:24504kB shmem:10424kB slab_reclaimable:5644kB slab_unreclaimable:7172kB kernel_stack:552kB pa
getables:3868kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
DMA: 10*4kB 6*8kB 1*16kB 3*32kB 25*64kB 2*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2056kB
DMA32: 811*4kB 26*8kB 5*16kB 1*32kB 4*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3820kB
8309 total pagecache pages
338 pages in swap cache
Swap cache stats: add 678051, delete 677713, find 250357/286709
Free swap = 1259148kB
Total swap = 1262076kB
130800 pages RAM
12213 pages reserved
10008 pages shared
111319 pages non-shared

It sure looks like a memory bug.