Re: How do I find out the cause for the hang?

Do you have the magic SysRq key enabled in the /etc/sysctl.conf ?
http://kbase.redhat.com/faq/FAQ_80_4154.shtm

I had the same issue where I would try to log in and the system would hang 
at the user prompt. It turned out to be the audit daemon hitting a 
threshold on the /var file system space available. There is a config file 
in /etc/audit/audit.conf that redhat recommended us modify to: 
/usr/sbin/audbin -S /var/log/audit.d/save.%u -C -T 7% 
If you as me this is a bug in the daemon but redhat insisted that it was 
working as designed.
If it is the same issue then you might see some auditbin or auditd error 
in the messages file around the time that the system hung.
Here is the Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=158591

Other possible causes that I found were in regards to IO timeouts or the 
inability to read a file system. The sysrq info should help find more 
info.

Hope this helps,
David Knight





"unix syzadmin" <[email protected]> 
Sent by: [email protected]
07/19/2006 03:53 AM
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Subject
How do I find out the cause for the hang?






Hi,
 
We have a RHEL AS 3 Update 6 server.  This server seems to hang everyday 
since a couple of days.
I tried to login (using telnet/ssh) when the users reported the problem. 
After I type the username at the login prompt the system seems to hang.
The only option for me would be to go to the lab and power-off and 
power-on.
 
What could be the possible causes?.  How do I find out the cause for the 
hang?.  Please suggest.
 
# more /etc/redhat-release
Red Hat Enterprise Linux AS release 3 (Taroon Update 6)
 
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