further help on debugging a hang
further help on debugging a hang
- Subject: further help on debugging a hang
- From: Giuliano Gavazzi <email@hidden>
- Date: Wed, 13 Dec 2006 01:57:21 +0100
sorry to disturb again, but the machine I am debugging cannot be left
off-line too long as it is a production server (and is at a remote
location), so I am looking for some advice.
A recap:
PowerMacG4 DP400 10.4.8 + security update 007 + ACARD 6890M SATA RAID
configured for mirroring.
Symptoms: every few days the machine hangs (it looks like the old
"rainbow of death") remaining responsive to pings but otherwise
inaccessible from both the console and ssh. Even telnet to an open
tcp port (say 80) will establish the connection but the process on
the other side will not respond any further (in this example a GET /
HTTP/1.0 <cr> <cr> will not give anything).
I have two prime suspects: the ACARD (driver or card) and lookupd.
The ACARD is suspect because this is the only machine running 10.4.8
I have mounting this card and the only one suffering from these hangs.
lookupd is suspect simply because the symptoms are so similar to what
one would get when lookupd stops working.
The machine, as I wrote previously, is set now to perform a kernel
dump to another machine on the LAN, but I am not sure at all that
this will help. Too much seems to be running still for the dump to
point at the source of the problem. I hope to be proven wrong when I
will manage to get the kernel dump.
What course of action would you take to debug it?
Thank you
Giuliano
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