Re: tcpdump crash on arm?

From: Olivier Houchard <mlfbsd_at_ci0.org>
Subject: Re: tcpdump crash on arm?
Date: Thu, 5 Apr 2007 13:03:05 +0200

> On Thu, Apr 05, 2007 at 10:28:18AM +0300, Krassimir Slavchev wrote:
> > Hi,
> > 
> > This is on 7.0-CURENT 4-5 days old but I have seen this for 2-3 months.
> > 
> > # ./tcpdump
> > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> > listening on ate0, link-type EN10MB (Ethernet), capture size 96 bytes
> > Bus error (core dumped)
> > 
> > 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
> > 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 "arm-marcel-freebsd"...
> > Core was generated by `tcpdump'.
> > Program terminated with signal 10, Bus error.
> > Reading symbols from /lib/libpcap.so.4...done.
> > Loaded symbols for /lib/libpcap.so.4
> > Reading symbols from /lib/libcrypto.so.5...done.
> > Loaded symbols for /lib/libcrypto.so.5
> > Reading symbols from /lib/libc.so.7...done.
> > Loaded symbols for /lib/libc.so.7
> > Reading symbols from /libexec/ld-elf.so.1...done.
> > Loaded symbols for /libexec/ld-elf.so.1
> > #0  0x000203a4 in ether_print ()
> > (gdb) bt
> > #0  0x000203a4 in ether_print ()
> > #1  0x00020730 in ether_if_print ()
> > #2  0x0005b594 in print_packet (user=0xbfffec18 "\020\a\002", h=0xbfffeb98,
> >    sp=0x2040901a "")
> >    at 
> > /usr/src-arm/src/usr.sbin/tcpdump/tcpdump/../../../contrib/tcpdump/tcpdump.c:1241
> > #3  0x200f05bc in pcap_lookupnet () from /lib/libpcap.so.4
> > #4  0x200f1a2c in pcap_loop () from /lib/libpcap.so.4
> > #5  0x0005c3b0 in $a ()
> >    at 
> > /usr/src-arm/src/usr.sbin/tcpdump/tcpdump/../../../contrib/tcpdump/tcpdump.c:1050
> > #6  0x0005c3b0 in $a ()
> >    at 
> > /usr/src-arm/src/usr.sbin/tcpdump/tcpdump/../../../contrib/tcpdump/tcpdump.c:1050
> > (gdb)
> > 
> 
> I remember seeing this, but I thought make worlding fixed it.
> Warner, do you remember what the issue was, and how/if we fixed it ?
> I think it had to do with the change in alignment somewhere.

I thought things were working.  I'll have to check again.

Warner