Doug Poland wrote:
On Thu, Oct 25, 2007 at 01:17:38AM +0200, Kris Kennaway wrote:
Doug Poland wrote:
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:
snip
Almost :)
What does 'bt' show in kgdb?
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: 199 183 167 151 135 119 103 87 71 55 39 23 7
#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)
(kgdb) backtrace
#0 doadump () at pcpu.h:195
#1 0xc074fed7 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2 0xc0750199 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc0a1485c in trap_fatal (frame=0xe74a7b8c, eva=151019524) at
/usr/src/sys/i386/i386/trap.c:872
#4 0xc0a14ae0 in trap_pfault (frame=0xe74a7b8c, usermode=0, eva=151019524) at
/usr/src/sys/i386/i386/trap.c:785
#5 0xc0a15455 in trap (frame=0xe74a7b8c) at /usr/src/sys/i386/i386/trap.c:463
#6 0xc09fb46b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc079c961 in mb_free_ext (m=0xc7151e00) at
/usr/src/sys/kern/uipc_mbuf.c:226
#8 0xc079cfc1 in m_freem (mb=0x0) at mbuf.h:510
#9 0xc051e39e in ath_rxbuf_init (sc=0xc6e95000, bf=0xc6e9cc94) at
/usr/src/sys/dev/ath/if_ath.c:3257
#10 0xc052595d in ath_rx_proc (arg=0xc6e95000, npending=1) at
/usr/src/sys/dev/ath/if_ath.c:3711
#11 0xc07809c5 in taskqueue_run (queue=0xc6dd8300) at
/usr/src/sys/kern/subr_taskqueue.c:255
#12 0xc0780bcb in taskqueue_thread_loop (arg=0xc6e96664) at
/usr/src/sys/kern/subr_taskqueue.c:374
#13 0xc07304b9 in fork_exit (callout=0xc0780b10 <taskqueue_thread_loop>,
arg=0xc6e96664, frame=0xe74a7d38) at /usr/src/sys/kern/kern_fork.c:796
#14 0xc09fb4e0 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:205
(kgdb)
Here's the whole thing with a backtrace. Thanks for your patience...
I asked Sam about this and he says he has seen it reported before but
not with enough details to track it down further. Can you file a PR and
describe your system network configuration in more detail, including
kernel config, dmesg, rc.conf and other settings, and any firewall rules
that are applied?
Kris
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