6.1-STABLE hangs, ddb shows 'acpi_timer_read'?

[Karl Pielorz]

Hi All,

We've got an HP DL380 server, stacked out with drives running Sendmail. The 
machine is quite busy (LA rarely below 4 - and it's three 'spindle' sets of 
RAID drives are always busy). It's probably constantly running 200-300 
copies of sendmail, plus an assortment of other processes (mostly admin 
scripts that kind of thing).

It's got a Xeon 3.2Ghz CPU (HT disabled), w/2Gb of RAM running a generic 
kernel, w/out IPv6 support (and with DDB/KDB included obviously)

This machine just 'hangs' every couple of days. I have DDB/KDB compiled in 
- and if I throw it into DDB I get the following:

[first couple of lines missed courtesy of screen-dump]
db> bt
Tracing pid 38 tid 100027 td 0xc6495180
acpi_timer_read(c0aba3c0,c09035c0,e6a05bbc,c0662ef3,c0aba3c0) at 
acpi_timer_read+0x13
acpi_timer_get_timecout_safe(c0aba3c0) at acpi_timer_get_timecount_safe+0xa
binuptime(e6a05be8) at binuptime+0x43
mi_switch(6,c6395900,c639a54,c639500,e6a05c34) at mi_swtich+0x33
maybe_preempt(c6395900) at maybe_preempt+0xc4
sched_add(c639500,4,c6495180,c6395900,c637f280) at sched_add+0x27
setrunqueue(c6395900,4) at setrunqueue+0x63
intr_even_schedule_thread(c637f280) at intr_event_schedule_thread+0xb5
intr_exectue_handlers(c638d6e0,e6a05cac,13,46a05cf4,c08189f3) at 
intr_execute_handlers+0x118
...

I have a crash dump from it - which I've saved (I'm moderately familiar 
with working with dumps, but this one is split into two?)

If anyone has any pointers, or can do some hand holding to get more info 
from the dump, or what to do next time it happens?

Cheers,

-Karl