[Marcin Gryszkalis <mgryszkalis@xxxxxxxxx>]

Hi, my tethereal dump core frequently (below any information you may need)

I run tethereal that way:
tethereal -i rl1 -t ad -R 'tcp.port == 80 and http.request == true'

root@black:/var/log,0# uname -srm
FreeBSD 4.5-RC i386

root@black:/var/log,0# tethereal -v
tethereal 0.9.0, with GLib 1.2.10, with libpcap 0.6, with libz 1.1.3, 
without SNMP

gdb `which tethereal` /var/log/tethereal.core (with bt) says:

#0  0x0 in ?? ()
#1  0x815f100 in dissect_response_data (tvb=0x8385550, pinfo=0x8330e08, 
convert=0, tree=0x83a3854,
    smb_info=0xbfbfe294, lanman=0x82701e0, has_ent_count=1, 
ent_count=3) at packet-smb-pipe.c:1917
#2  0x815fa1c in dissect_pipe_lanman (pd_tvb=0x8385584, p_tvb=0x838551c, 
d_tvb=0x8385550, pinfo=0x8330e08,
    parent_tree=0x8384818) at packet-smb-pipe.c:2197
#3  0x81602f4 in dissect_pipe_smb (sp_tvb=0x0, s_tvb=0x0, 
pd_tvb=0x8385584, p_tvb=0x838551c, d_tvb=0x8385550,
    pipe=0x0, pinfo=0x8330e08, tree=0x8384818) at packet-smb-pipe.c:2866
#4  0x8158ddb in dissect_transaction_response (tvb=0x83854e8, 
pinfo=0x8330e08, tree=0x83a39f8, offset=127,
    smb_tree=0x83a3720) at packet-smb.c:11453
#5  0x815912a in dissect_smb_command (tvb=0x83854e8, pinfo=0x8330e08, 
top_tree=0x8384818, offset=32,
    smb_tree=0x83a3720, cmd=37 '%') at packet-smb.c:11824
#6  0x815a5c1 in dissect_smb (tvb=0x83854e8, pinfo=0x8330e08, 
parent_tree=0x8384818) at packet-smb.c:13862
#7  0x81c33b4 in dissector_try_heuristic (sub_dissectors=0x831d1e0, 
tvb=0x83854e8, pinfo=0x8330e08, tree=0x8384818)
    at packet.c:808
#8  0x80f9e3d in dissect_netbios_payload (tvb=0x83854e8, 
pinfo=0x8330e08, tree=0x8384818) at packet-netbios.c:967
#9  0x80f6d42 in dissect_nbss_packet (tvb=0x83854b4, offset=4, 
pinfo=0x8330e08, tree=0x8384818, max_data=131,
    is_cifs=0) at packet-nbns.c:1498
#10 0x80f6fe0 in dissect_nbss (tvb=0x83854b4, pinfo=0x8330e08, 
tree=0x8384818) at packet-nbns.c:1673
#11 0x81c2c18 in dissector_try_port (sub_dissectors=0x8334580, port=139, 
tvb=0x83854b4, pinfo=0x8330e08,
    tree=0x8384818) at packet.c:459
#12 0x8173b2e in decode_tcp_ports (tvb=0x8385480, offset=20, 
pinfo=0x8330e08, tree=0x8384818, src_port=139,
    dst_port=1062) at packet-tcp.c:794
#13 0x817490a in dissect_tcp (tvb=0x8385480, pinfo=0x8330e08, 
tree=0x8384818) at packet-tcp.c:1095
#14 0x81c2c18 in dissector_try_port (sub_dissectors=0x831ae60, port=6, 
tvb=0x8385480, pinfo=0x8330e08, tree=0x8384818)
    at packet.c:459
#15 0x80c2dbf in dissect_ip (tvb=0x838544c, pinfo=0x8330e08, 
tree=0x8384818) at packet-ip.c:1118
#16 0x81c2c18 in dissector_try_port (sub_dissectors=0x831a9a0, 
port=2048, tvb=0x838544c, pinfo=0x8330e08,
    tree=0x8384818) at packet.c:459
#17 0x809cc00 in ethertype (etype=2048, tvb=0x8385418, 
offset_after_etype=14, pinfo=0x8330e08, tree=0x8384818,
    fh_tree=0x839c958, etype_id=667, trailer_id=669) at 
packet-ethertype.c:156
#18 0x809c962 in dissect_eth (tvb=0x8385418, pinfo=0x8330e08, 
tree=0x8384818) at packet-eth.c:230
#19 0x81c2c18 in dissector_try_port (sub_dissectors=0x831aa00, port=1, 
tvb=0x8385418, pinfo=0x8330e08, tree=0x8384818)
    at packet.c:459
#20 0x809e515 in dissect_frame (tvb=0x8385418, pinfo=0x8330e08, 
tree=0x8384818) at packet-frame.c:142
#21 0x81c3759 in call_dissector (handle=0x831c160, tvb=0x8385418, 
pinfo=0x8330e08, tree=0x8384818) at packet.c:923
#22 0x81c283b in dissect_packet (edt=0x8330e00, pseudo_header=0x0, 
pd=0x837c3ae "", fd=0xbfbfee58, cinfo=0x8319258)
    at packet.c:210
#23 0x81c0a1f in epan_dissect_run (edt=0x8330e00, pseudo_header=0x0, 
data=0x837c3ae "", fd=0xbfbfee58, cinfo=0x8319258)
    at epan.c:103
#24 0x81ad350 in wtap_dispatch_cb_print (user=0xbfbfeed0 "@\2210\b", 
phdr=0xbfbfeedc, offset=0, pseudo_header=0x0,
    buf=0x837c3ae "") at tethereal.c:1357
#25 0x81acad8 in capture_pcap_cb (user=0x8303bc4 "\001", phdr=0x837c39c, 
pd=0x837c3ae "") at tethereal.c:1034
#26 0x283d26b9 in pcap_read () from /usr/lib/libpcap.so.2
#27 0x283d22d3 in pcap_dispatch () from /usr/lib/libpcap.so.2
#28 0x81ac760 in capture (packet_count=-1, out_file_type=2) at 
tethereal.c:930
#29 0x81ac2c6 in main (argc=7, argv=0xbfbff784) at tethereal.c:737
#30 0x805ce51 in _start ()


if you need some additional info, just ask :)
greetings
marcin

--
Marcin Gryszkalis <mg@xxxxxxxxx>
or <dagoon@xxxxxxxxxxxxxxxx>