Date: Fri, 7 Aug 2009 14:20:27 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-current@freebsd.org Subject: Fatal trap 12: page fault while in kernel mode - current process: flowcleaner Message-ID: <20090807142027.1a30e8ba@fabiankeil.de>
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Using:
FreeBSD TP51.local 8.0-BETA2 FreeBSD 8.0-BETA2 #36: Sat Aug 1 00:07:09 CES=
T 2009
fk@TP51.local:/usr/obj/usr/src/sys/THINKPAD i386
I got the following panic:
fk@TP51 /usr/crash $kgdb /boot/kernel/kernel.symbols vmcore.6
GNU gdb 6.1.1 [FreeBSD]
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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 =3D 0; apic id =3D 00
fault virtual address =3D 0x0
fault code =3D supervisor read, page not present
instruction pointer =3D 0x20:0x0
stack pointer =3D 0x28:0xf1a2fc94
frame pointer =3D 0x28:0xf1a2fcd8
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 40 (flowcleaner)
panic: from debugger
cpuid =3D 0
Uptime: 2m1s
Physical memory: 998 MB
Dumping 144 MB: 129 113 97 81 65 49 33 17 1
Reading symbols from /boot/kernel/unionfs.ko...Reading symbols from /boot/k=
ernel/unionfs.ko.symbols...done.
done.
[...]
Loaded symbols for /boot/kernel/fdescfs.ko
#0 doadump () at pcpu.h:246
246 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) where
#0 doadump () at pcpu.h:246
#1 0xc0678e66 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c:4=
19
#2 0xc06790a2 in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:575
#3 0xc04f2e57 in db_panic (addr=3DCould not find the frame base for "db_pa=
nic".
) at /usr/src/sys/ddb/db_command.c:478
#4 0xc04f33e1 in db_command (last_cmdp=3D0xc0a1f31c, cmd_table=3D0x0, dopa=
ger=3D1) at /usr/src/sys/ddb/db_command.c:445
#5 0xc04f353a in db_command_loop () at /usr/src/sys/ddb/db_command.c:498
#6 0xc04f532d in db_trap (type=3D12, code=3D0) at /usr/src/sys/ddb/db_main=
.c:229
#7 0xc06a33c6 in kdb_trap (type=3D12, code=3D0, tf=3D0xf1a2fc54) at /usr/s=
rc/sys/kern/subr_kdb.c:534
#8 0xc0913a8f in trap_fatal (frame=3D0xf1a2fc54, eva=3D0) at /usr/src/sys/=
i386/i386/trap.c:924
#9 0xc0913cc3 in trap_pfault (frame=3D0xf1a2fc54, usermode=3D0, eva=3D0) a=
t /usr/src/sys/i386/i386/trap.c:846
#10 0xc091469a in trap (frame=3D0xf1a2fc54) at /usr/src/sys/i386/i386/trap.=
c:528
#11 0xc08f83bb in calltrap () at /usr/src/sys/i386/i386/exception.s:165
#12 0x00000000 in ?? ()
Previous frame inner to this frame (corrupt stack?)
The backtrace in ddb mentioned several flow* functions,
but unfortunately it doesn't seem to have survived the
dump.
The problem occurred after booting the system with the rc.conf line:
ifconfig_wlan0=3D"inet 192.168.178.49 -wme"
changing it to:
ifconfig_wlan0=3D"inet 192.168.178.49 ssid [...] wepkey 1:[0x...] deftxke=
y 1 wepmode on chanlist 7 -wme"
running:
/etc/rc.d/netif restart
followed by:
ifconfig wlan0
which showed that wlan0 got associated.
The panic happened less than a second later.
The system is an IBM ThinkPad R51 with iwi0 as wlandev.
em0 was configured and up but unconnected.
Fabian
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