I'm running OpenBSD's chrooted httpd process and for the last few days I'm getting random hangups that clear themselves without any intervention on my part. At first I thought it might be a resource problem as SSH was hanging at the same time, but have left 'top' running on the console which shows nothing out of the ordinary (memory usage is low, no high load, etc).
I managed to get my users to call me exactly when this happens instead of 20-30 minutes later, and noticed in my error logs the following:
Timeout ^@Timeout ^@Timeout ^@Timeout
That's all that is on the line. Sometimes the number of ^@Timeout's vary, but that is all that is sitting there. I've looked at the access logs to see if some of the potentially hanging processes like curl calls might be doing it, but I didn't see any correlation.
The site that is running in a custom PHP app that has, up until lately, not had any problems. No new code changes were pushed up at the same time this started happening.
Anyone else come across a situation like this, or have any ideas?
[Edit - 06-11-2009]
Looks like something else is going on outside of this server. The Timeout prints seem to happen randomly, but I think I'm seeing this same thing happen on a network level were connections are hanging.
Thanks for the input though!