Re: Can't make snort create a core file when it segfaults.

[Russ Combs <rcombs () sourcefire com>]

Andy,

Now that you can get a core do you have info for us to help you debug the
problem?

The version, conf, any relevant logs, and, ideally, a stack trace would be a
good start.

Thanks
Russ

On Tue, Feb 9, 2010 at 11:00 AM, Andy Berryman <aberryman () cymtec com> wrote:

> Got it to work. Thanks for the help. Had to add these two lines to my
> script that started snort.
>
> ulimit -c unlimited
> echo "/snort/%e-%p" >/proc/sys/kernel/core_pattern
>
>
> Thanks,
> Andy
>
> -----Original Message-----
> From: Jason Brvenik [mailto:jasonb () sourcefire com]
>  Sent: Monday, February 08, 2010 4:41 PM
> To: Andy Berryman
> Cc: Matt Watchinski; snort-users () lists sourceforge net
> Subject: Re: [Snort-users] Can't make snort create a core file when it
> segfaults.
>
> set ulimit in a debug version of that script and give it a try again.
>
> On Mon, Feb 8, 2010 at 5:30 PM, Andy Berryman <aberryman () cymtec com>
> wrote:
> > It's started with "snortrestart" which contains this.
> >
> > #! /bin/bash
> > PID=`ps -elf | grep snort | grep -v grep | grep -v bash | awk '{print
> $4}'`;
> > kill -kill $PID  > /dev/null 2>&1;
> > LD_LIBRARY_PATH=/libs /snort -D -N -i eth1 -c /conf/snort.conf 2>&1 &
> > exit 0;
> >
> >
> > I can't run it with gdb unfortunately.
> >
> > -----Original Message-----
> > From: Jason Brvenik [mailto:jasonb () sourcefire com]
> > Sent: Monday, February 08, 2010 4:07 PM
> > To: Andy Berryman
> > Cc: Matt Watchinski; snort-users () lists sourceforge net
> > Subject: Re: [Snort-users] Can't make snort create a core file when it
> segfaults.
> > How are you starting snort? Can you set ulimit on startup instead?
> >
> > I suspect it being reset is a function of limits.conf or /etc/profile
> > or ... setting it
> >
> > can you just run it under gdb?
> >
> > On Mon, Feb 8, 2010 at 4:58 PM, Andy Berryman <aberryman () cymtec com>
> wrote:
> > > Yes, I am.
> > >
> > >
> > >
> > > -bash-2.05b# whoami
> > >
> > > root
> > >
> > > -bash-2.05b#
> > >
> > >
> > >
> > >
> > >
> > > Thanks,
> > >
> > > Andy
> > >
> > >
> > >
> > > From: Matt Watchinski [mailto:mwatchinski () sourcefire com]
> > > Sent: Monday, February 08, 2010 3:56 PM
> > > To: Andy Berryman
> > > Cc: snort-users () lists sourceforge net
> > > Subject: Re: [Snort-users] Can't make snort create a core file when it
> > > segfaults.
> > >
> > >
> > >
> > > Are you running ulimit as root?
> > >
> > > Cheers,
> > > -matt
> > >
> > > On Mon, Feb 8, 2010 at 4:51 PM, Andy Berryman <aberryman () cymtec com>
> wrote:
> > > One of my test boxes is segfaulting regularly. When it does, I can't
> make it
> > > create a core dump into a file. I've google'd and not found any answers.
> > >
> > >
> > >
> > > I run "ulimit -c 1000000"
> > >
> > > Then I run "ulimit -a" to see that it's set the file size correctly.
> > >
> > >
> > >
> > > Then snort will segfault and I'll run "ulimit -a" and the file size will
> be
> > > back at zero again. I do a search of my file system with "find / -name
> > > '*core*' and nothing comes back.
> > >
> > >
> > >
> > >
> > >
> > > Any suggestions?
> > >
> > >
> > >
> > > It's this error every time in the syslog when it happens.
> > >
> > >
> > >
> > > Feb  8 20:43:13 (none) kernel: snort[29313]: segfault at a ip 08079700
> sp
> > > bfa8ac98 error 4 in snort[8048000+a1000]
> > >
> > >
> > >
> > > Feb  8 20:43:43 (none) kernel: snort[29510]: segfault at a ip 08079700
> sp
> > > bfb30c18 error 4 in snort[8048000+a1000]
> > >
> > >
> > >
> > > Feb  8 21:04:54 (none) kernel: snort[29547]: segfault at a ip 08079700
> sp
> > > bfbb05e8 error 4 in snort[8048000+a1000]
> > >
> > >
> > >
> > > Feb  8 21:06:24 (none) kernel: snort[30630]: segfault at a ip 08079700
> sp
> > > bf888348 error 4 in snort[8048000+a1000]
> > >
> > >
> > >
> > >
> > >
> > > It'll do it every couple seconds, or it'll run for about 20 min and do
> it or
> > > an hour and do it. It's not predictable that I can tell.
> > >
> > > I've disabled it loading the so_rules and that didn't work, then I
> disabled
> > > it loading all the other rules and that didn't work either. I read
> somewhere
> > > that it could be the wrong precompiled rules being used, so I deleted
> the
> > > snort_dynamicrules file and that didn't work either.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Thanks,
> > >
> > > Andy Berryman
> > >
> > > Cymtec Systems
> > >
> > > support () cymtec com
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> > >
> > >
> > > --
> > > Matthew Watchinski
> > > Sr. Director Vulnerability Research Team (VRT)
> > > Sourcefire, Inc.
> > > Office: 410-423-1928
> > > http://vrt-sourcefire.blogspot.com && http://www.snort.org/vrt/
> ------------------------------------------------------------------------------
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>
>
>
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