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Date:      Mon, 11 Oct 2004 12:23:17 -0700
From:      Sean McNeil <sean@mcneil.com>
To:        freebsd-current@freebsd.org
Subject:   natd crashing again with current/amd64
Message-ID:  <1097522597.1123.4.camel@server>

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Since a build yesterday I am back to crashing.  Something was fixed
Friday or Saturday that cured it, but now it is failing somewhere else:

Oct 11 07:36:19 server kernel: Fatal trap 12: page fault while in kernel mo=
de
Oct 11 07:36:19 server kernel: fault virtual address    =3D 0x18
Oct 11 07:36:19 server kernel: fault code               =3D supervisor read=
, page
not present
Oct 11 07:36:19 server kernel: instruction pointer      =3D 0x8:0xffffffff8=
03528c0Oct 11 07:36:19 server kernel: stack pointer            =3D 0x10:0xf=
fffffffb1eea5f0
Oct 11 07:36:19 server kernel: frame pointer            =3D 0x10:0xffffffff=
b1eea650
Oct 11 07:36:19 server kernel: code segment             =3D base 0x0, limit=
 0xfffff, type 0x1b
Oct 11 07:36:19 server kernel: =3D DPL 0, pres 1, long 1, def32 0, gran 1
Oct 11 07:36:19 server kernel: processor eflags =3D interrupt enabled, resu=
me, IOPL =3D 0
Oct 11 07:36:19 server kernel: current process          =3D 249 (natd)
Oct 11 07:36:19 server kernel: trap number              =3D 12

I don't have a traceback, but I can tell you where the failure is:

0xffffffff803528c0 is in m_copypacket (/usr/src/sys/kern/uipc_mbuf.c:452).
447             if (!m_dup_pkthdr(n, m, how))
448                     goto nospace;
449             n->m_len =3D m->m_len;
450             if (m->m_flags & M_EXT) {
451                     n->m_data =3D m->m_data;
452                     n->m_ext =3D m->m_ext;
453                     n->m_flags |=3D M_EXT;
454                     MEXT_ADD_REF(m);
455             } else {
456                     n->m_data =3D n->m_pktdat + (m->m_data - m->m_pktda=
t );

I am rebuilding world now and if it persists I will attempt to get my
kernel to drop into debug.

Sean


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