Panic on -current

[walt]

I've seen this twice while trying to start up gnome desktop.  Once
on a system built Sept 6, and again today after updating on Sept 21:

Fatal trap 12: page fault while in kernel mode
(kgdb) bt
#0  dumpsys () at thread.h:83
#1  0xc01a0b2f in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:335
#2  0xc01a10c5 in panic (fmt=0xc0315e2f "%s") at
/usr/src/sys/kern/kern_shutdown.c:684
#3  0xc02e2916 in trap_fatal (frame=0xcf091b58, eva=0) at
/usr/src/sys/i386/i386/trap.c:1174
#4  0xc02e25b3 in trap_pfault (frame=0xcf091b58, usermode=0, eva=5) at
/usr/src/sys/i386/i386/trap.c:1076
#5  0xc02e2233 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = 0, tf_esi = 0, tf_ebp =
-821486696, tf_isp = -821486716, tf_ebx = 0, tf_edx = 0, tf_ecx = -819127488,
tf_eax = -1, tf_trapno = 12, tf_err = 0, tf_eip = -1072115408, tf_cs = 8,
tf_eflags = 66067, tf_esp = -821486676, tf_ss = -1070748914}) at
/usr/src/sys/i386/i386/trap.c:653
#6  0xc02d2d5f in calltrap () at /usr/src/sys/i386/i386/exception.s:774
#7  0xc018d130 in major (x=0x0) at /usr/src/sys/kern/kern_conf.c:80
#8  0xc02dab0e in iszerodev (dev=0x0) at /usr/src/sys/i386/i386/mem.c:535
#9  0xc027d1b3 in kern_mmap (vms=0xcecfdc00, uaddr=0xffffffff <Address
0xffffffff out of bounds>, ulen=0, uprot=1,
    uflags=2, fd=7, upos=0, res=0xffffffff) at /usr/src/sys/vm/vm_mmap.c:298
#10 0xc027d3fe in sys_mmap (uap=0xcf2d1b40) at thread.h:80
#11 0xc02e2bde in syscall2 (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 682090496, tf_esi = 7,
tf_ebp = -1077950664, tf_isp = -821486220, tf_ebx = 680743236, tf_edx = 0,
tf_ecx = 2, tf_eax = 198, tf_trapno = 0, tf_err = 2, tf_eip = 680329364, tf_cs =
31, tf_eflags = 518, tf_esp = -1077950724, tf_ss = 47}) at
/usr/src/sys/i386/i386/trap.c:1390
#12 0xc02d2dea in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:852
#13 0x0000001f in ?? ()
#14 0x0000002f in ?? ()
#15 0x00000000 in ?? ()
#16 0x00000000 in ?? ()
#17 0x00000000 in ?? ()
#18 0x00000000 in ?? ()
#19 0x1413f000 in ?? ()
#20 0xc80a3200 in ?? ()
#21 0xc80a6100 in ?? ()
#22 0xcf0919f4 in ?? ()
#23 0xcf0919d4 in ?? ()
#24 0xff800000 in ?? ()
#25 0xc01a6715 in lwkt_switch () at /usr/src/sys/kern/lwkt_thread.c:740
Previous frame inner to this frame (corrupt stack?)
(kgdb)

I suspect that something about my x11/gnome environment may be running
the system out of memory, but I'm not sure.  I can put the dump files
on leaf if you want.