[syslog-ng] Repeated log messages?

Balazs Scheidler bazsi at balabit.hu
Mon Mar 17 10:12:46 CET 2008

On Wed, 2008-03-12 at 14:07 -0400, John Morrissey wrote:
> On Fri, Feb 29, 2008 at 07:08:14PM +0100, Balazs Scheidler wrote:
> > On Fri, 2008-02-29 at 12:59 -0500, John Morrissey wrote:
> > > Recently, we've noticed a few machines are filling up their log filesystems
> > > with duplicate log entries. At first, I thought this behavior was caused by
> > > running out of disk space (i.e., the machine runs out of disk and syslog-ng
> > > does some sort of buffering, and as disk space oscellates between a few
> > > hundred bytes available and completely full, syslog-ng is writing this
> > > buffered log data out to disk but never removing the log entries from its
> > > buffer), but I can't reliably reproduce it.
> > 
> > Hm... is it possible that syslog-ng somehow loops back to itself? I
> > remember a problem which caused syslog-ng to resolve a destination host
> > name as if DNS was unavailable, effectively causing it to send
> > messages to localhost.
> That's exactly it; syslog-ng has a UDP socket open and is sending data to
> its own UDP listener socket. I'd like to backport a targeted patch if
> possible, and haven't looked through the git repo yet; do you have an idea
> when this was fixed, or know the git revision it was fixed in?

It was fixed here, e.g. it was included in 2.0.6

Author: Balazs Scheidler <bazsi at balabit.hu>  2007-10-23 17:04:46
Committer: Balazs Scheidler <bazsi at balabit.hu>  2007-10-23 17:04:46
Parent: 2288151086e2557c8a30e37c1b4a37a7b373fffb (fixed implicit declaration of strtol warning)
Child:  1661ca746f13eacf3c5e0d08640dd00c71548d11 (fixed ipv6 address resolution as only parts of the sockaddr_in6 structure were copied)
Follows: v2.0.5

    unset destination/bind address if a name resolution error occurs (fixes: #12393)
    2007-10-23  Balazs Scheidler <bazsi at balabit.hu>
    	* src/afinet.c (afinet_resolve_name): changed prototype to require a
    	  pointer to GSockAddr *, set the passed reference to NULL whenever
    	  a resolve error occurs (fixes: #12393),
    	  (various functions): changed all afinet_resolve_name invocations
    	  to use the new prototype


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