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Date: Fri, 19 Nov 2004 10:50:49 +0000 (GMT)
From: Robert Watson <rwatson@freebsd.org>
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To: Slawek Zak <zaks@prioris.mini.pw.edu.pl>
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cc: stable@freebsd.org
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Subject: Re: Network related panic on FreeBSD 5.3-STABLE/AMD64
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On Fri, 19 Nov 2004, Robert Watson wrote:

> 
> On Fri, 19 Nov 2004, Slawek Zak wrote:
> 
> > I can reproduce it easily,
> > 
> > The panic message and backtrace is:
> 
> Could I get you to convert the symbol+offsets below to line numbers
> using gdb on a copy of your kernel with debugging symbols?  In
> particular, the offsets into tcp_output, tcp_input, and ip_input.

Also, since this is highly reproduceable for you, could you try running
with "options SOCKBUF_DEBUG"?  It could be that we're looking at a socket
buffer corruption issue, and this debugging option will catch it earlier
(at some cost to performance).

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> Thanks!
> 
> Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
> robert@fledge.watson.org      Principal Research Scientist, McAfee Research
> 
> 
> > 
> > 	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
> > 
> 
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