Fatal trap 12 in open()

I updated the i386 package machines to -current tonight and they all
panicked shortly thereafter with this trace (including all while
running ldconfig, which may be significant):

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x60
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc054d906
stack pointer           = 0x10:0xd98e09e4
frame pointer           = 0x10:0xd98e09e4
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         = 4611 (ldconfig)
kernel: type 12 trap, code=0
Stopped at      devsw+0x6:      cmpl    $0,0x60(%eax)
db> trace
devsw(0,d98e0a0c,c05d2642,7a69,c4670480) at devsw+0x6
spec_open(d98e0a64,d98e0a44,c06b6e48,d98e0a64,d98e0b20) at spec_open+0x4a
spec_vnoperate(d98e0a64,d98e0b20,c05dad92,d98e0a64,c056729d) at spec_vnoperate+0x18
ufs_vnoperatespec(d98e0a64,c056729d,c07d01e0,c4e96930,c580571c) at ufs_vnoperatespec+0x18
vn_open_cred(d98e0bdc,d98e0cdc,0,c4670480,3) at vn_open_cred+0x432
vn_open(d98e0bdc,d98e0cdc,0,3,d98e0b78) at vn_open+0x33
kern_open(c4e96930,2812633f,0,1,0) at kern_open+0xce
open(c4e96930,d98e0d14,c077eee3,3e6,3) at open+0x30
syscall(2f,2f,2f,3e,804f01e) at syscall+0x2a0
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (5, FreeBSD ELF32, open), eip = 0x280b9f67, esp = 0xbfbfe56c, ebp = 0xbfbfe638 ---

(kgdb) bt
#0  doadump () at /a/asami/portbuild/i386/src-client/sys/kern/kern_shutdown.c:240
#1  0xc046e435 in db_fncall (dummy1=1016, dummy2=0, dummy3=1016, dummy4=0xcee4b7ec "\f")
    at /a/asami/portbuild/i386/src-client/sys/ddb/db_command.c:548
#2  0xc046e172 in db_command (last_cmdp=0xc07c1f60, cmd_table=0x0, aux_cmd_tablep=0xc0783b54,
    aux_cmd_tablep_end=0xc0783b58) at /a/asami/portbuild/i386/src-client/sys/ddb/db_command.c:346
#3  0xc046e2c5 in db_command_loop () at /a/asami/portbuild/i386/src-client/sys/ddb/db_command.c:472
#4  0xc0471325 in db_trap (type=12, code=0) at /a/asami/portbuild/i386/src-client/sys/ddb/db_trap.c:73
#5  0xc0704f3c in kdb_trap (type=12, code=0, regs=0xcee4b9a4)
    at /a/asami/portbuild/i386/src-client/sys/i386/i386/db_interface.c:171
#6  0xc07153e6 in trap_fatal (frame=0xcee4b9a4, eva=0) at /a/asami/portbuild/i386/src-client/sys/i386/i386/trap.c:814
#7  0xc07150b2 in trap_pfault (frame=0xcee4b9a4, usermode=0, eva=96)
    at /a/asami/portbuild/i386/src-client/sys/i386/i386/trap.c:733
#8  0xc0714c93 in trap (frame=
      {tf_fs = -1021706216, tf_es = -1056833520, tf_ds = -1056833520, tf_edi = 256, tf_esi = -1012982216, tf_ebp = -823871004, tf_isp = -823871024, tf_ebx = 1, tf_edx = 0, tf_ecx = 15, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip = -1068181242, tf_cs = 8, tf_eflags = 66118, tf_esp = -823870932, tf_ss = -1068288070})
    at /a/asami/portbuild/i386/src-client/sys/i386/i386/trap.c:420
#9  0xc0706908 in calltrap () at {standard input}:94
#10 0xc05337ba in spec_open (ap=0xcee4ba64) at /a/asami/portbuild/i386/src-client/sys/fs/specfs/spec_vnops.c:151
#11 0xc0533768 in spec_vnoperate (ap=0x0) at /a/asami/portbuild/i386/src-client/sys/fs/specfs/spec_vnops.c:122
#12 0xc06b6e48 in ufs_vnoperatespec (ap=0x0) at /a/asami/portbuild/i386/src-client/sys/ufs/ufs/ufs_vnops.c:2840
#13 0xc05dad92 in vn_open_cred (ndp=0xcee4bbdc, flagp=0xcee4bcdc, cmode=0, cred=0xc2e31900, fdidx=0) at vnode_if.h:228
#14 0xc05da953 in vn_open (ndp=0x0, flagp=0x0, cmode=0, fdidx=0)
    at /a/asami/portbuild/i386/src-client/sys/kern/vfs_vnops.c:93
#15 0xc05d3dce in kern_open (td=0xc31743f0, path=0x0, pathseg=UIO_USERSPACE, flags=1, mode=0)
    at /a/asami/portbuild/i386/src-client/sys/kern/vfs_syscalls.c:971
#16 0xc05d3cf0 in open (td=0x0, uap=0x0) at /a/asami/portbuild/i386/src-client/sys/kern/vfs_syscalls.c:941
#17 0xc0715760 in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 62, tf_esi = 134541342, tf_ebp = -1077942728, tf_isp = -823870092, tf_ebx = 672309644, tf_edx = 2676, tf_ecx = 0, tf_eax = 5, tf_trapno = 12, tf_err = 2, tf_eip = 671850343, tf_cs = 31, tf_eflags = 642, tf_esp = -1077942932, tf_ss = 47}) at /a/asami/portbuild/i386/src-client/sys/i386/i386/trap.c:1008
#18 0xc070695d in Xint0x80_syscall () at {standard input}:136
---Can't read userspace from dump, or kernel process---

Kris