I just noticed that it is also the case with kern.log:

$ ls -lah kern.log*
-rw-r----- 1 syslog adm 178K 2008-11-25 10:49 kern.log
-rw-r----- 1 syslog adm  15G 2008-11-24 01:05 kern.log.0
-rw-r----- 1 syslog adm 118M 2008-11-18 09:40 kern.log.1.gz
-rw-r----- 1 syslog adm  69M 2008-11-17 11:13 kern.log.2.gz
-rw-r----- 1 syslog adm  15K 2008-11-10 22:44 kern.log.3.gz

I think the cause of these large files might also have been waking up
with a thread scheduling problem:

Nov 20 19:46:08 tatooine kernel: [28959.216716] Call Trace:
Nov 20 19:46:08 tatooine kernel: [28959.216718]  [<ffffffff8023e06d>] 
dequeue_task_idle+0x2d/0x40
Nov 20 19:46:08 tatooine kernel: [28959.216721]  [<ffffffff8023c436>] 
dequeue_task+0x96/0xe0
Nov 20 19:46:08 tatooine kernel: [28959.216723]  [<ffffffff8023c4d3>] 
deactivate_task+0x23/0x30
Nov 20 19:46:08 tatooine kernel: [28959.216726]  [<ffffffff80500685>] 
thread_return+0x108/0x3c3
Nov 20 19:46:08 tatooine kernel: [28959.216728]  [<ffffffff8026d12e>] ? 
sched_clock_idle_wakeup_event+0xe/0x10
Nov 20 19:46:08 tatooine kernel: [28959.216731]  [<ffffffff80210ecd>] 
cpu_idle+0xad/0x110
Nov 20 19:46:08 tatooine kernel: [28959.216734]  [<ffffffff804fd735>] 
start_secondary+0x97/0xc2
Nov 20 19:46:08 tatooine kernel: [28959.216735] 
Nov 20 19:46:08 tatooine kernel: [28959.216823] bad: scheduling from the idle 
thread!
Nov 20 19:46:08 tatooine kernel: [28959.216826] Pid: 0, comm: swapper Tainted: 
P          2.6.27-7-generic #1
Nov 20 19:46:08 tatooine kernel: [28959.216827] 
Nov 20 19:46:08 tatooine kernel: [28959.216828] Call Trace:
Nov 20 19:46:08 tatooine kernel: [28959.216830]  [<ffffffff8023e06d>] 
dequeue_task_idle+0x2d/0x40
Nov 20 19:46:08 tatooine kernel: [28959.216832]  [<ffffffff8023c436>] 
dequeue_task+0x96/0xe0
Nov 20 19:46:08 tatooine kernel: [28959.216835]  [<ffffffff8023c4d3>] 
deactivate_task+0x23/0x30
Nov 20 19:46:08 tatooine kernel: [28959.216837]  [<ffffffff80500685>] 
thread_return+0x108/0x3c3
Nov 20 19:46:08 tatooine kernel: [28959.216840]  [<ffffffff8026d12e>] ? 
sched_clock_idle_wakeup_event+0xe/0x10
Nov 20 19:46:08 tatooine kernel: [28959.216843]  [<ffffffff80210ecd>] 
cpu_idle+0xad/0x110
...etc

-- 
syslog.0 and kern.log.0 grow huge
https://bugs.launchpad.net/bugs/115774
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