kernel hang (5.04 - 2.6.11-1-686 #1)

[t scytale]

recently updated to hoary
$ uname -a
Linux shai-hulud 2.6.11-1-686 #1 Fri Feb 11 15:59:02 UTC 2005 i686 GNU/Linux

my system freezes up at random. at first i thought it was X crashing
(haven't tried to ping/ssh in to test this) but my logs show this :

Apr 14 20:47:47 localhost kernel:  [schedule+1293/1298] schedule+0x50d/0x512
Apr 14 20:47:47 localhost kernel:  [__get_free_pages+51/63]
__get_free_pages+0x33/0x3f
Apr 14 20:47:47 localhost kernel:  [schedule_timeout+99/183]
schedule_timeout+0x63/0xb7
Apr 14 20:47:47 localhost kernel:  [process_timeout+0/9] process_timeout+0x0/0x9
Apr 14 20:47:47 localhost kernel:  [do_poll+161/192] do_poll+0xa1/0xc0
Apr 14 20:47:47 localhost kernel:  [sys_poll+335/527] sys_poll+0x14f/0x20f
Apr 14 20:47:47 localhost kernel:  [sys_gettimeofday+59/127]
sys_gettimeofday+0x3b/0x7f
Apr 14 20:47:47 localhost kernel:  [__pollwait+0/198] __pollwait+0x0/0xc6
Apr 14 20:47:47 localhost kernel:  [sysenter_past_esp+82/117]
sysenter_past_esp+0x52/0x75

over and over and over. 
any ideas?