how to find out what the other CPU is doing
Randall Stewart
rrs at cisco.com
Wed Jan 10 18:44:54 UTC 2007
All:
I have now pinpointed a problem.. or at least
I know whats going on..
I have a dual-core machine..
CPU1 gets swi: net running on it.. I am sure it
has received an SCTP packet since it has a lock
on a TCB.
the sw4: clock sio in fact gets hung up waiting
for the locked TCB that swi:net holds.
The other CPU, cpu0 is still free.. I can
thus drop into DDB>
I took a core of this.. but I could not
gain much.. and it comes from my ignorance I think..
So my question is how do I find out what loop
swi:net is trapped in..
If I have a kernel core, can I somehow look at this?
I dumped the entire stack and poked around in it
a bit.. looking at where its esp and ebp were set.. but
I could not figure out how to follow this..
I tried using
proc 'tid'
(as John suggested to me) and when I try a bt
it just gives me a
???? and an address..
Is there anyway I can get a hint out of the situation.
If I do trace in DDB> it just showed me where I was
on CPU0 with the keyboard interupt.. etc..
Any help in getting additional info would be wonderful... I need
to at least get a hint as to how this thing is in a loop..
I currently have the machine cooking again.. it takes 3-4 days
to get it to hit this state...
So if someone has an idea of something to try I would apprecicate
it :-)
Thanks in advance
R
--
Randall Stewart
NSSTG - Cisco Systems Inc.
803-345-0369 <or> 803-317-4952 (cell)
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