[syslog-ng] [Bug 212] strange hostnames from /etc/hosts with threaded(yes);

[bugzilla at bugzilla.balabit.com]

https://bugzilla.balabit.com/show_bug.cgi?id=212





--- Comment #9 from Brian Kroth <bpkroth at gmail.com>  2012-12-12 16:35:28 ---
(In reply to comment #8)
> but how did we escape noticing this bug so far? I understand that DNS caching can hide this bug. 
> Brian, do you have lots of hosts to resolve? 

There have been ~1200 unique hosts check in within the last log retention period, but I think it's more like ~1000 daily.  In the past we'd bumped the dns
cache size up to account for that, but that hasn't changed in a long time.

> Or did you change the DNS caching parameters?

Nothing changed there recently (years).  The only thing I did was try to backport the 3.3 series of syslog-ng specifically for the threaded option to try and
work around some scaling issues we were seeing.

The reentrant problem mentioned earlier strikes me as familiar from other past projects, though I couldn't say for sure off the top of my head.  I'm happy to
test it if you've got some packages for me somewhere.

Thanks,
Brian


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