Date: Wed, 25 Dec 2002 21:57:26 +0100 From: Poul-Henning Kamp <phk@freebsd.org> To: current@freebsd.org Subject: RELENG_5_0 netcat/UDP panic Message-ID: <23396.1040849846@critter.freebsd.dk>
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RELENG_5_0 GENERIC with DDB enabled.
ifconfig 3 of four interfaces on a DLink 580TX card
Run four times:
nc -l -p 2000 -u > /dev/null &
On other machines, suitably network configured and connected:
cat /dev/zero | nc -u 10.1.0.2 2000 &
cat /dev/zero | nc -u 10.2.0.2 2000 &
cat /dev/zero | nc -u 10.3.0.2 2000 &
After a few seconds, I get a panic:
fault virtual address = 0xb
...
Stopped at ip_input+0x610: cmpw 0xa(%ebx),%dx
Show registers confirm what the above claims:
%ebx = 0x1
As far as I can tell from the assembly, this is the first
comparison in this loop:
TAILQ_FOREACH(fp, &ipq[sum], ipq_list)
if (ip->ip_id == fp->ipq_id &&
ip->ip_src.s_addr == fp->ipq_src.s_addr &&
ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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