I just got this panic while using poudriere to build packages for
FreeBSD 8.4 i386.  This is hand transcribed because I was not able to
get a core file.

Fatal trap 12: page fault while in kernel mode
cpuid = 6; apic id = 16
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80a51e14
stack pointer           = 0x20:0xfffffe005acc77a0
frame pointer           = 0x20:0xfffffe005acc77d0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 78211 (initial thread)
[ thread pid 78211 tid 101405 ]
Stopped at      cap_rights_contains+0x24:       movq    (%r14),%rcx)
db> bt
Tracing pid 78211 tid 101405 td 0xfffff80139td29a0
cap_rights_contains() at cap_rights_contains+0x24/frame
cap_check() at cap_check+0x15/frame 0xfffffe005acc7800
fget_unlocked() at fget_unlocked+0xca/frame 0xfffffe005acc7870
fget() at fget+0x2b/frame 0xfffffe005acc78a0
ksem_get at ksem_get+0x1e/frame 0xfffffe05acc78e0
sys_ksem_close() at sys_ksem_close+0x23/frame 0xfffffe005acc7920
ia32_syscall() at ia32_syscall+0x2a5/frame 0xfffffe005acc7a30
Xint0x00_syscall() at Xint0x00_syscall+0x95/frame 0xfffffe00acc7a30
--- syscall (400, FreeBSD ELF32, sys_ksem_close), rip = 0x2828676b, rsp
= 0xffffc60c, rbp = 0xffffc628 ---

# kgdb /boot/kernel/kernel /dev/kmem
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 "amd64-marcel-freebsd"...
Failed to open vmcore: cannot mmap corefile
(kgdb) list cap_rights_contains+0x24
Junk at end of line specification.
(kgdb) list *cap_rights_contains+0x24
0xffffffff80a51e14 is in cap_rights_contains 
289     cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little)
290     {
291             unsigned int i, n;
293             assert(CAPVER(big) == CAP_RIGHTS_VERSION_00);
294             assert(CAPVER(little) == CAP_RIGHTS_VERSION_00);
295             assert(CAPVER(big) == CAPVER(little));
297             n = CAPARSIZE(big);
298             assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);

This machine has mirrored swap and dumpdev=AUTO.  Calling doadump in ddb
seemed to dump memory contents somewhere, but savecore wasn't able to
find it.

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