Fatal trap 12 panic in recent -current

System was left idle for a few hours (in X, running Blender, mozilla, xterms)
doing nothing. System rebooted when I plugged in a umass device (ipod,
possibly unrelated). When it came back up, I got a backtrace, as follows.
FYI, sources as of Dec 30, running with Nvidia driver.

panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x10
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc0543343
stack pointer           = 0x10:0xc9f89c80
frame pointer           = 0x10:0xc9f89cac
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         = 27 (swi8: tty:sio clock)
trap number             = 12
panic: page fault

syncing disks, buffers remaining... 1295 1295 1295 1295 1295 1295 1295 1295
129
 1295 1295 1295 1295 1295 1295 1295 1295 1295 1295 1295 
giving up on 816 buffers
Uptime: 12h47m56s
Dumping 127 MB
 16 32 48 64 80 96 112
---
Reading symbols from
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/lin
x/linux.ko.debug...done.
Loaded symbols for
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/linux
linux.ko.debug
Reading symbols from /boot/kernel/nvidia.ko...done.
Loaded symbols for /boot/kernel/nvidia.ko
Reading symbols from /boot/kernel/ng_ubt.ko...done.
Loaded symbols for /boot/kernel/ng_ubt.ko
Reading symbols from /boot/kernel/netgraph.ko...done.
Loaded symbols for /boot/kernel/netgraph.ko
Reading symbols from
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/ntf
/ntfs.ko.debug...done.
Loaded symbols for
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/ntfs/
tfs.ko.debug
Reading symbols from
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/lin
rocfs/linprocfs.ko.debug...done.
Loaded symbols for
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/linpr
cfs/linprocfs.ko.debug
Reading symbols from
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/ipf
/ipfw.ko.debug...done.
Loaded symbols for
/usr/obj/usr/src/sys/URIEL/modules/usr/src/sys/modules/ipfw/
pfw.ko.debug
Reading symbols from /boot/kernel/logo_saver.ko...done.
Loaded symbols for /boot/kernel/logo_saver.ko
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
240             dumping++;
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc05a1909 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc05a1ce8 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc072efb6 in trap_fatal (frame=0xc9f89c40, eva=0) at
/usr/src/sys/i386/i38
/trap.c:821
#4  0xc072ec52 in trap_pfault (frame=0xc9f89c40, usermode=0, eva=16) at
/usr/sr
/sys/i386/i386/trap.c:735
#5  0xc072e7ad in trap (frame=
      {tf_fs = -1067778024, tf_es = -1065615344, tf_ds = 16, tf_edi =
-10162718
2, tf_esi = -1015529472, tf_ebp = -906453844, tf_isp = -906453908, tf_ebx = 7, 
f_edx = 4, tf_ecx = 0, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip =
-106822
677, tf_cs = 8, tf_eflags = 66118, tf_esp = -1015529472, tf_ss = 608})
    at /usr/src/sys/i386/i386/trap.c:420
#6  0xc071fb48 in calltrap () at {standard input}:94
#7  0xc05b3d5e in softclock (dummy=0x0) at
/usr/src/sys/kern/kern_timeout.c:226
#8  0xc058b938 in ithread_loop (arg=0xc12c9580) at
/usr/src/sys/kern/kern_intr.
:544
#9  0xc058a5b0 in fork_exit (callout=0xc058b760 <ithread_loop>, arg=0x0,
frame=
x0) at /usr/src/sys/kern/kern_fork.c:793
(kgdb) up 7
#7  0xc05b3d5e in softclock (dummy=0x0) at
/usr/src/sys/kern/kern_timeout.c:226
226                                     c_func(c_arg);
(kgdb) l
221                                     }
222     #ifdef DIAGNOSTIC
223                                     binuptime(&bt1);
224                                     mtx_lock(&dont_sleep_in_callout);
225     #endif
226                                     c_func(c_arg);
227     #ifdef DIAGNOSTIC
228                                     mtx_unlock(&dont_sleep_in_callout);
229                                     binuptime(&bt2);
230                                     bintime_sub(&bt2, &bt1);
(kgdb) 

-- 
Michael McGoldrick: michael_at_mcgoldrick.org