Not sure if the panmic is initiated in sys_fstatat, but here's
the trace. dumped core - see /var/crash/vmcore.1

Mon Feb  2 09:38:44 PST 2015

#0 r278102M: Mon Feb  2 09:15:48 PST 2015  amd64

panic: general protection fault

Fatal trap 9: general protection fault while in kernel mode
cpuid = 2; apic id = 12
instruction pointer     = 0x20:0xffffffff80754567
stack pointer           = 0x28:0xfffffe0469290560
frame pointer           = 0x28:0xfffffe04692905a0
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         = 62150 (rm)
trap number             = 9
panic: general protection fault
cpuid = 2
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0469290220
panic() at panic+0x1c1/frame 0xfffffe04692902e0
trap_fatal() at trap_fatal+0x380/frame 0xfffffe0469290340
trap() at trap+0x6d1/frame 0xfffffe04692904a0
calltrap() at calltrap+0x8/frame 0xfffffe04692904a0
--- trap 0x9, rip = 0xffffffff80754567, rsp = 0xfffffe0469290560, rbp = 
0xfffffe04692905a0 ---
ufs_getattr() at ufs_getattr+0x87/frame 0xfffffe04692905a0
VOP_GETATTR_APV() at VOP_GETATTR_APV+0x7a/frame 0xfffffe04692905d0
vn_stat() at vn_stat+0x62/frame 0xfffffe04692906c0
kern_statat() at kern_statat+0xe4/frame 0xfffffe0469290880
sys_fstatat() at sys_fstatat+0x2c/frame 0xfffffe0469290920
amd64_syscall() at amd64_syscall+0x289/frame 0xfffffe0469290a30
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0469290a30
--- syscall (493, FreeBSD ELF64, sys_fstatat), rip = 0x2008b3e9a, rsp = 
0x7fffffffdc88, rbp = 0x7fffffffdd30 ---
Uptime: 10m14s

#0  doadump (textdump=Unhandled dwarf expression opcode 0x93
) at pcpu.h:219
219     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=Unhandled dwarf expression opcode 0x93
) at pcpu.h:219
#1  0xffffffff80559f47 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:448
#2  0xffffffff8055a3b0 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:747
#3  0xffffffff807a85c0 in trap_fatal (frame=<value optimized out>, 
    eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:861
#4  0xffffffff807a8221 in trap (frame=<value optimized out>)
    at /usr/src/sys/amd64/amd64/trap.c:201
#5  0xffffffff8078d843 in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:235
#6  0xffffffff80754567 in ufs_getattr (ap=<value optimized out>)
    at /usr/src/sys/ufs/ufs/ufs_vnops.c:463
#7  0xffffffff808074fa in VOP_GETATTR_APV (vop=<value optimized out>, 
    a=<value optimized out>) at vnode_if.c:731
#8  0xffffffff80607e62 in vn_stat (vp=0xfffff80088086000, 
    sb=0xfffffe0469290710, active_cred=0xfffff8000b07d800, file_cred=0x1, 
    td=0xfffff801b5063000) at vnode_if.h:309
#9  0xffffffff806017e4 in kern_statat (td=0xfffff801b5063000, 
    flag=<value optimized out>, fd=<value optimized out>, 
    path=<value optimized out>, pathseg=UIO_USERSPACE, 
    sbp=0xfffffe04692908a0, hook=0xfefff80034ba0700)
    at /usr/src/sys/kern/vfs_syscalls.c:2241
#10 0xffffffff80601acc in sys_fstatat (td=0xfffff802dbc03dc8, 
    uap=0xfffffe04692909c0) at /usr/src/sys/kern/vfs_syscalls.c:2215
#11 0xffffffff807a8db9 in amd64_syscall (td=0xfffff801b5063000, traced=0)
    at subr_syscall.c:133
#12 0xffffffff8078db2b in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:395
#13 0x00000002008b3e9a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal

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