Troubleshooting a Freeze

Ryan Sandridge ryansandridge at
Sat Dec 20 11:31:34 PST 2003

Are there any general or specific tips on how to figure out what is  
causing FreeBSD to just freeze up?  The machine is not at my physical  
location, and I log in using ssh.  I've checked all the logs in  
/var/log for some kind of clue, but I haven't found anything helpful.   
The machine has worked fine for over 6 months, until the last few days  
it freezes up at apparently random times, normally within the first 12  
hours of being up.  While many ports have been added over the past 6  
months, nothing was added on or around the time I started experiencing  
the problem.

I guess I was wondering what some first steps people would take to  
troubleshoot an unexplained system hang.

Some details:

FreeBSD 4.8-RELEASE #0: Thu Apr  3 10:53:38 GMT 2003
     root at
Timecounter "i8254"  frequency 1193182 Hz
CPU: AMD Athlon(tm) XP 1800+ (1541.22-MHz 686-class CPU)
   Origin = "AuthenticAMD"  Id = 0x662  Stepping = 2
   AMD Features=0xc0480000<MP,AMIE,DSP,3DNow!>
real memory  = 536805376 (524224K bytes)
avail memory = 517066752 (504948K bytes)

open ports: ssh, smtp, imaps, pop3s, 8080 (http), https


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