[Snort-devel] Snort exited on signal 6

Mike gmm at ...3433...
Tue Sep 17 06:06:47 EDT 2013

Hi Russ,

> Thanks for reporting the problem.  Are you able to reproduce it?
Yes, it is happening on several network interfaces.
> If so, can you run in a debugger and get a backtrace?

Here it is:

 gdb /usr/local/bin/snort
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
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 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "amd64-marcel-freebsd"...
 (gdb) set args -q -u snort -g snort -c /usr/local/etc/snort/snort_bce1.conf -i bce1
 (gdb) run
 Starting program: /usr/local/bin/snort -q -u snort -g snort -c /usr/local/etc/snort/snort_bce1.conf -i bce1
 [New LWP 100119]
 [New Thread 802007400 (LWP 100119/snort)]
 [New Thread 802008400 (LWP 100637/snort)]
 Assertion failed: (b < HTTP_BUFFER_MAX && buf), function SetHttpBufferEncoding, file ../../src/detection_util.h, line 142.
 Program received signal SIGABRT, Aborted.
 [Switching to Thread 802007400 (LWP 100119/snort)]
 0x0000000801cc340c in thr_kill () from /lib/libc.so.7
 (gdb) bt
 #0  0x0000000801cc340c in thr_kill () from /lib/libc.so.7
 #1  0x0000000801d5fcc3 in abort () from /lib/libc.so.7
 #2  0x0000000801d44c5d in __assert () from /lib/libc.so.7
 #3  0x000000000049eeba in SetHttpBufferEncoding (b=HTTP_BUFFER_RAW_COOKIE, buf=0x0, len=0, enc=0) at detection_util.h:142
 #4  0x000000000049ef5e in SetHttpBuffer (b=HTTP_BUFFER_RAW_COOKIE, buf=0x0, len=0) at detection_util.h:152
 #5  0x000000000049e0b4 in SnortHttpInspect (GlobalConf=0x802018fc0, p=0x802f2e400) at snort_httpinspect.c:3762
 #6  0x0000000000496012 in HttpInspect (p=0x802f2e400, context=0x0) at spp_httpinspect.c:209
 #7  0x000000000043ff76 in Preprocess (p=0x802f2e400) at detect.c:173
 #8  0x00000000004cfa2e in _flush_to_seq (tcpssn=0x8068397a0, st=0x8068398f8, bytes=15953, p=0xebd1c0, sip=0xebdaf0, dip=0xebdadc, sp=62447, dp=20480, dir=128)
     at snort_stream5_tcp.c:3875
 #9  0x00000000004cf2f4 in flush_to_seq (tcpssn=0x8068397a0, st=0x8068398f8, bytes=15953, p=0xebd1c0, sip=0xebdaf0, dip=0xebdadc, sp=62447, dp=20480, dir=128)
     at snort_stream5_tcp.c:3950
 #10 0x00000000004cfe84 in flush_ackd (tcpssn=0x8068397a0, st=0x8068398f8, p=0xebd1c0, sip=0xebdaf0, dip=0xebdadc, sp=62447, dp=20480, dir=128) at snort_stream5_tcp.c:4016
 #11 0x00000000004dc98f in CheckFlushPolicyOnAck (tcpssn=0x8068397a0, talker=0x8068398f8, listener=0x8068397a0, tdb=0x7fffffffd2e0, p=0xebd1c0) at snort_stream5_tcp.c:8886
 #12 0x00000000004db526 in ProcessTcp (lwssn=0x8197ef170, p=0xebd1c0, tdb=0x7fffffffd2e0, s5TcpPolicy=0x812007000) at snort_stream5_tcp.c:8557
 #13 0x00000000004d1cc1 in Stream5ProcessTcp (p=0xebd1c0, lwssn=0x8197ef170, s5TcpPolicy=0x812007000, skey=0x7fffffffd440) at snort_stream5_tcp.c:5088
 #14 0x00000000004ac5b1 in Stream5Process (p=0xebd1c0, context=0x0) at spp_stream5.c:1694
 #15 0x00000000004400f7 in Preprocess (p=0xebd1c0) at detect.c:215
 #16 0x000000000043345b in ProcessPacket (p=0xebd1c0, pkthdr=0x7fffffffd640, pkt=0x818f7b17a "", ft=0x0) at snort.c:1846
 #17 0x0000000000432ef5 in PacketCallback (user=0x0, pkthdr=0x7fffffffd640, pkt=0x818f7b17a "") at snort.c:1685
 #18 0x00000000005155d4 in pcap_process_loop ()
 #19 0x0000000801615716 in pcap_create_interface () from /lib/libpcap.so.8
 #20 0x000000000051597a in pcap_daq_acquire ()
 #21 0x0000000000457078 in DAQ_Acquire (max=0, callback=0x432d68 <PacketCallback>, user=0x0) at sfdaq.c:539
 #22 0x0000000000435656 in PacketLoop () at snort.c:3169
 #23 0x0000000000431b39 in SnortMain (argc=10, argv=0x7fffffffd928) at snort.c:890
 #24 0x00000000004319d0 in main (argc=10, argv=0x7fffffffd928) at snort.c:797
> A pcap and conf that triggers it would be most helpful.

snort_bce1.conf is attached.

Unfortunately, I can't reproduce problem feeding the tcpdump-formatted file to the snort.
Problem happens only on live network traffic.  


> Thanks
>  Russ

> On Wed, Sep 11, 2013 at 11:11 AM, Michael M Galapchuk
> wrote:
> Hi everyone,
>  in my new setup Snort exited on signal 6 shortly after start
>  Sep 11 17:26:41 snort kernel: pid 1663 (snort), uid 40000: exited on signal 6
>  Here is some information in /tmp/snort.debug:
>  Assertion failed: (b < HTTP_BUFFER_MAX && buf), function
> SetHttpBufferEncoding, file ../../src/detection_util.h, line 142.
>  snort -V
>  Version GRE (Build 132) FreeBSD
>  By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team
>  Copyright (C) 1998-2013 Sourcefire, Inc., et al.
>  Using libpcap version 1.4.0
>  Using PCRE version: 8.33 2013-05-28
>  Using ZLIB version: 1.2.7
>  Should I provide some additional info?
>  Mike.
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