Date: Wed, 24 Oct 2007 15:08:40 -0500 From: Doug Poland <doug@polands.org> To: freebsd-stable@freebsd.org Subject: Fatal trap 12 on 7.0-BETA1 i386 Message-ID: <471FA648.7020407@polands.org>
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Hello,
I just had a kernel panic using BETA1. According to the Developer
Handbook Kernel Debugging, I'm supplying the following information in
hopes that it is useful. Please note: I'm not familiar with this
process so you need more data, just ask:
kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x9006004
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc079c961
stack pointer = 0x28:0xe74a7bcc
frame pointer = 0x28:0xe74a7be0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 46 (ath0 taskq)
trap number = 12
panic: page fault
cpuid = 1
Uptime: 4h9m30s
Physical memory: 3435 MB
Dumping 214 MB: ...
#0 doadump () at pcpu.h:195
195 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) list *0xc079c961
0xc079c961 is in mb_free_ext (/usr/src/sys/kern/uipc_mbuf.c:226).
221 * check if the header is embedded in the cluster
222 */
223 skipmbuf = (m->m_flags & M_NOFREE);
224
225 /* Free attached storage if this mbuf is the only
reference to it. */
226 if (*(m->m_ext.ref_cnt) == 1 ||
227 atomic_fetchadd_int(m->m_ext.ref_cnt, -1) == 1) {
228 switch (m->m_ext.ext_type) {
229 case EXT_PACKET: /* The packet zone is
special. */
230 if (*(m->m_ext.ref_cnt) == 0)
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