Snmptrapd fails to read config after being sent 4096 SIGHUPs?

Hi list,

Here's one I've been scratching my head over lately.

We have a bit of an oddball solution, where we've got snmptrapd logging a
lot of traps into a file, which is parsed by an external tool. This is all
running on a HP-UX 11.2 system, with Net-SNMP version 5.6.1.1 delivered
with the "HP-UX Internet Express" package.

A cron job runs "logrotate" every 15 minutes, and if the file is too big,
it's rotated, and the postrotate script issues a SIGHUP to snmptrapd. That
normally triggers the daemon to re-read its config and to restart the
logging into a new file.

The snmptrapf.config is set up to use a particular one-line trap logging
format.

It seems that every so often, the snmptrapd fails subtly on SIGHUP. It only
seems to happen after more than a couple of months have passed. 60 days, 91
days, 101 days, 113 days are some of the fault intervals.

I've observed the following about the failure state after it happens:
- Snmptrapd is executing and logging traps
- The trap logging format has changed to the default trap logging format
(three lines per trap). This causes our parser to fail
- snmptrapd logs the error "[...]/snmptrapd.conf: line 0: Error: maximum
conf file count (4096) exceeded" at the start of the log file.

The flow of traps is such that the log file is usually rotated every 30
minutes, but it goes up and down a bit. Could this failure be happening
after 4096 SIGHUPs? That would explain the varying time between failures.

I'm grateful for any input.

Regards,
Joel Hansell

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