From owner-freebsd-stable@FreeBSD.ORG  Fri Nov 19 10:10:08 2004
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Date: Fri, 19 Nov 2004 11:09:56 +0100
From: Slawek Zak <zaks@prioris.mini.pw.edu.pl>
To: stable@freebsd.org
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cc: pjd@freebsd.org
cc: rwatson@freebsd.org
Subject: Network related panic on FreeBSD 5.3-STABLE/AMD64
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Hi,

I can reproduce it easily,

The panic message and backtrace is:

	panic: m_copym, offset > size of mbuf chain
	cpuid = 1
	KDB: enter: panic
	[thread 100025]
	Stopped at      kdb_enter+0x2f: nop
	db> trace
	kdb_enter() at kdb_enter+0x2f
	panic() at panic+0x249
	m_copym() at m_copym+0x1b1
	tcp_output() at tcp_output+0xce8
	tcp_input() at tcp_input+0x2d95
	ip_input() at ip_input+0x10f
	netisr_processqueue() at netisr_processqueue+0x17
	swi_net() at swi_net+0x116
	ithread_loop() at ithread_loop+0xd9
	fork_exit() at fork_exit+0xc3
	fork_trampoline() at fork_trampoline+0xe
	--- trap 0, rip = 0, rsp = 0xffffffffb19bad00, rbp = 0 ---

I was able to collect a coredump, if it helps, I can make it available
to interrested parties along with kernel.debug.

The machine is 2 processor SunFire V20z, debug.mpsafenet is 0.

TIA, /S