[syslog-ng] missing logs when SIGHUP

[Martin Ervius]

I had done a 'make clean' before, but I think I found the problem when
looking through the config parameters.

Instead of my config file, I used the example one and it didn't segfault. I
narrowed it down to the 'destination' parameters which seem to need a
variable like ($HOST or $FACILITY) in the destination file (havent tried
this version with other destinations than files).

In my config I had destination path names like '/var/log/tcp.log'. When I
changed that to '/var/log/$HOST_tcp.log' it didn't die anymore. Can you
reproduce this behaviour? Apparently It doesn't matter where a variable is
present on each line, but it needs one on every destination.

I proceeded with testing the SIGHUP problem and as far as I can see your
patch works perfectly. I tested as I had done before and there was no loss
of logs. I even stress tested a bit by sending 10 HUP's per second while
syslog-ng received five million rows (@25000 rows/sec) from another server.
Everything still worked fine :)

Thanks for your help on this!


// Martin


On Dec 3, 2007 7:09 PM, Balazs Scheidler <bazsi at balabit.hu> wrote:

>
> On Mon, 2007-12-03 at 18:58 +0100, Martin Ervius wrote:
> > Here is the backtrace, (running under ubuntu 7.10 i386):
> >
> > root at krait[0]syslog-ng-2.0.git# /opt/syslog-ng-2.0.git/sbin/syslog-ng
> > Segmentation fault (core dumped)
> > root at krait[139]syslog-ng-2.0.git# gdb /opt/syslog-
> > ng-2.0.git/sbin/syslog-ng -c core
> > GNU gdb 6.6-debian
> > 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 "i486-linux-gnu"...
> > Using host libthread_db library
> > "/lib/tls/i686/cmov/libthread_db.so.1".
> >
> > warning: Can't read pathname for load map: Input/output error.
> > Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...done.
> > Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
> > Reading symbols from /lib/tls/i686/cmov/librt.so.1...done.
> > Loaded symbols for /lib/tls/i686/cmov/librt.so.1
> > Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
> > Loaded symbols for /lib/tls/i686/cmov/libc.so.6
> > Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...done.
> > Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0
> > Reading symbols from /lib/ld-linux.so.2...done.
> > Loaded symbols for /lib/ld-linux.so.2
> > Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...done.
> > Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
> > Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...done.
> > Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
> > Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...done.
> > Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
> > Core was generated by `/opt/syslog-ng-2.0.git/sbin/syslog-ng'.
> > Program terminated with signal 11, Segmentation fault.
> > #0  0x08057bd5 in affile_dw_set_owner (self=0x0, owner=0x8098858) at
> > affile.c:381
> > 381       if (self->owner)
> > (gdb) bt full
> > #0  0x08057bd5 in affile_dw_set_owner (self=0x0, owner=0x8098858) at
> > affile.c:381
> > No locals.
>
> Hmm... I encountered a similar error in my tree when I forgot to "make
> clean" before recompiling. Can you check if you do a make clean and then
> recompile the above problem goes away?
>
> I also have Ubuntu 7.10 installed and it works for me:
>
> bazsi at bzorp:~/zwa/work/syslog-ng-2.0/syslog-ng$ git-rev-list --max-count=1
> HEAD
> a33ee30c1e059c1c6dc9839047379f3f3a8dfa4d
> bazsi at bzorp:~/.zwa/install/syslog-ng-2.0$ sbin/syslog-ng -Fedvf
> etc/syslog-ng.conf
> Connection failed; error='No such file or directory (2)'
> Initiating connection failed, reconnecting; time_reopen='5'
> syslog-ng starting up; version='2.0.6'
> Termination requested via signal, terminating;
> syslog-ng shutting down; version='2.0.6'
> Closing log reader fd; fd='7'
> Error saving persistent configuration file;
> name='/home/bazsi/zwa/install/syslog-ng-2.0/var/syslog-ng.persist'
> Closing log reader fd; fd='5'
> Closing log reader fd; fd='4'
>
>
> --
> Bazsi
>
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>
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