Re: further help on debugging a hang
Re: further help on debugging a hang
- Subject: Re: further help on debugging a hang
- From: Chris Zubrzycki <email@hidden>
- Date: Tue, 12 Dec 2006 20:14:51 -0500
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Dec 12, 2006, at 7:57 PM, Giuliano Gavazzi wrote:
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.
I would try to rule out lookupd. Maybe have it log the most verbose
(but it'll spam syslog too unless you block it) and log it to a
separate file, to examine after a hang. man lookupd will show the
way. Also, you could kill and restart lookupd maybe every 24 hours or
so. That might be enough to keep it alive, if indeed it is lookupd
dying. Those are some troubleshooting methods I would use.
- -chris zubrzycki
- - --
PGP public key: http://homepage.mac.com/beren/publickey.txt
ID: 0xA2ABC070
Fingerprint: 26B0 BA6B A409 FA83 42B3 1688 FBF9 8232 A2AB C070
========================================================
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (Darwin)
Comment: Please sign reply-http://www.gnupg.org
iEYEARECAAYFAkV/VA8ACgkQ+/mCMqKrwHDaSQCgx97a7tUTO8n8N2pWsJWgAEcO
xjkAn0U7QNh+i+TuYRZZliIe/H1QK48l
=/rLX
-----END PGP SIGNATURE-----
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden