[syslog-ng] Syslog-ng-2.05 Segmentation Fault

Shashank Vinchurkar shashank at rohati.com
Thu Nov 8 19:35:05 CET 2007

I was hitting this issue on mips64 (had reported it on this list).
Debugging the issue the culprit seemed to be the call
g_free(self->re_matches) in function log_msg_clear_matches (logmsg.c).
The values of the self->re_matches was zero when it was getting segfault
but the pointer self->re_matches had a non-null value. Making the g_free
conditional seemed to work for me.

I was able to get past this issue but was seeing some other strange
behavior and could not get the syslog-ng to work on mips64. I was not
able to get the messages to log to the log file /var/log/messages
(reported it on this list). Debugging the issue it seemed the
g_string_printf in log_write_format_log function was not working
properly on 64bit mips and thus the log was never written to the file or
any other output device.

-----Original Message-----
From: syslog-ng-bounces at lists.balabit.hu
[mailto:syslog-ng-bounces at lists.balabit.hu] On Behalf Of Balazs
Sent: Thursday, November 08, 2007 7:21 AM
To: Syslog-ng users' and developers' mailing list
Subject: Re: [syslog-ng] Syslog-ng-2.05 Segmentation Fault

Hm.. the same has been reported on a mips64 system. This must be a 64
bit related issue, then. I'll try to get a 64 compile environment.

Anyone else who uses syslog-ng 2.0.x on 64 bit systems?

On Thu, 2007-11-08 at 23:34 +1100, Daniel Szmandiuk wrote:
> Here's the backtrace:
> GNU gdb Red Hat Linux (6.5-16.el5rh)
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> This GDB was configured as "x86_64-redhat-linux-gnu"...Using host
> libthread_db library "/lib64/libthread_db.so.1".


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