5.4-STABLE panic: kernel trap 12 with interrupts diabled

[Fabian Keil]

Hello list,

the day before yesterday I experienced my first
panic on 5.4-STABLE. Build and cvsup'ed last
Friday. My system is a ThinkPad R51

I did nothing spectacular, after boot I:

logged in as user
cdrecord -scanbus (which didn't work as I hadn't yet set it suid)
su
chmod +x for cdrecord and readcd (meant was +g ;-)
exit
cdrecord -scanbus (didn't yet work ;-)
su
cdrecord -scanbus (did work)
readcd dev=2,0,0 -factor meshpoints=100 f=./file
exit

Then I moved the laptop and plugged in the AC/DC adapter.

whoami brought me:

Kernel trap 12 with interrupts disabled
Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0xa94d06c
fault code                  = supervisor read, page not present
instruction pointer     = 0x8:0xc053cbe5
stack pointer             = 0x10:0xe669f98c
frame pointer            = 0x10:0xe669f990
code segment           = base 0x0, limit 0xfffff, type 0x1b
                                 = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 601 (whoami)
trap number             = 12
panic: page fault

I saved the dump manually with savecore and then tried
to follow:
<http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#KERNEL-PANIC-TROUBLESHOOTING>

fk at r51 ~ $nm -n /boot/kernel/kernel | grep c053cb
c053cb4c T init_turnstiles
c053cbc9 t init_turnstile0
c053cbd8 t turnstile_setowner

My kernel contains "makeoptions     DEBUG=-g",  however
I don't have the file /sys/compile/KERNELCONFIG/kernel.debug
and thus wasn't able to do
% gdb -k /sys/compile/KERNELCONFIG/kernel.debug /var/crash/vmcore.0

The next best thing seemed to be the -c option, no luck either.

fk at r51 ~ $gdb -c vmcore.0 
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".
"/usr/home/fk/vmcore.0" is not a core dump: File format not recognized
(gdb) 

fk at r51 ~ $cat info.0 
Dump header from device /dev/ad0s3b
  Architecture: i386
  Architecture Version: 16777216
  Dump Length: 536215552B (511 MB)
  Blocksize: 512
  Dumptime: Tue May  3 20:18:11 2005
  Hostname: r51.local
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 5.4-STABLE #6: Sat Apr 30 14:57:04 CEST 2005
    fk at r51.local:/usr/obj/usr/src/sys/THINKPAD
  Panic String: page fault
  Dump Parity: 1084811848
  Bounds: 0
  Dump Status: good

The kernel was build "the new way".
I was not able to reproduce the panic.

Is there anything else I can do?

Regards
Fabian
-- 
http://www.fabiankeil.de/