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Date:      Fri, 13 Oct 2000 12:58:09 +0930
From:      Greg Lehey <grog@lemis.com>
To:        FreeBSD current users <FreeBSD-current@FreeBSD.ORG>
Subject:   Panic "m_copydata, negative off" out of tcp_output
Message-ID:  <20001013125809.K2593@wantadilla.lemis.com>

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I've been having a few panics lately with a PRE_SMPNG snap:

kgdb) bt
#0  dumpsys () at ../../kern/kern_shutdown.c:461
#1  0xc01cf043 in boot (howto=256) at ../../kern/kern_shutdown.c:302
#2  0xc01cf3e5 in panic (fmt=0xc037db85 "m_copydata, negative off %d") at ../../kern/kern_shutdown.c:550
#3  0xc01edd02 in m_copydata (m=0x0, off=-1, len=1, cp=0xc0cd7970 "xmission\003com") at ../../kern/uipc_mbuf.c:766
#4  0xc02356a0 in tcp_output (tp=0xcb54d720) at ../../netinet/tcp_output.c:590
#5  0xc02343f3 in tcp_input (m=0xc0cd7900, off0=20, proto=6) at ../../netinet/tcp_input.c:2249
#6  0xc022e5d2 in ip_input (m=0xc0cd7900) at ../../netinet/ip_input.c:750
#7  0xc022e62f in ipintr () at ../../netinet/ip_input.c:778

Does anybody recognize this?

Greg
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