Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x378
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80924251
stack pointer           = 0x28:0xfffffe02381767e0
frame pointer           = 0x28:0xfffffe0238176860
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         = 5 (pagedaemon)
trap number             = 12
panic: page fault
cpuid = 2
DB: stack backtrace:
#0 0xffffffff80975160 at kdb_backtrace+0x60
#1 0xffffffff809390d5 at panic+0x155
#2 0xffffffff80d2a16f at trap_fatal+0x38f
#3 0xffffffff80d2a46d at trap_pfault+0x2ed
#4 0xffffffff80d29aea at trap+0x47a
#5 0xffffffff80d0fef2 at calltrap+0x8
#6 0xffffffff8092409a at __mtx_lock_flags+0x5a
#7 0xffffffff81c919b1 at ipc_thr_act_terminate+0x31
#8 0xffffffff81c7b581 at mach_thread_fini+0x51
#9 0xffffffff80948f22 at thread_fini+0x92
#10 0xffffffff80baa683 at zone_drain_wait+0x2e3
#11 0xffffffff80bae0cd at uma_reclaim+0xbd
#12 0xffffffff80bc9035 at vm_pageout+0x365
#13 0xffffffff8090814a at fork_exit+0x9a
#14 0xffffffff80d1042e at fork_trampoline+0xe
Uptime: 6h36m55s
Dumping 1160 out of 8164 MB:..2%..12%..21%..31%..42%..51%..61%..71%..82%..91%

Reading symbols from /boot/kernel.old/zfs.ko.symbols...done.
Loaded symbols for /boot/kernel.old/zfs.ko.symbols
Reading symbols from /boot/kernel.old/opensolaris.ko.symbols...done.
Loaded symbols for /boot/kernel.old/opensolaris.ko.symbols
Reading symbols from /boot/kernel.old/mach.ko.symbols...done.
Loaded symbols for /boot/kernel.old/mach.ko.symbols
#0  doadump (textdump=<value optimized out>) at pcpu.h:219
219     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff80938d52 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:452
#2  0xffffffff80939114 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80d2a16f in trap_fatal (frame=<value optimized out>,
    eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:859
#4  0xffffffff80d2a46d in trap_pfault (frame=0xfffffe0238176730,
    usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:676
#5  0xffffffff80d29aea in trap (frame=0xfffffe0238176730)
    at /usr/src/sys/amd64/amd64/trap.c:442
#6  0xffffffff80d0fef2 in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:236
#7  0xffffffff80924251 in __mtx_lock_sleep (c=0xfffff8005a67a850,
    tid=18446735277705673024, opts=0,
    file=0x100 <Address 0x100 out of bounds>, line=147308544)
    at /usr/src/sys/kern/kern_mutex.c:433
#8  0xffffffff8092409a in __mtx_lock_flags (c=<value optimized out>,
   opts=89143616, file=0x0, line=256) at /usr/src/sys/kern/kern_mutex.c:224
#9  0xffffffff81c919b1 in ipc_thr_act_terminate (thr_act=0xfffff8005a67a7f8)
    at /usr/src/sys/compat/mach/kern/ipc_tt.c:410
#10 0xffffffff81c7b581 in mach_thread_fini (arg=0x0, td=0xfffff8002ba6b940)
    at /usr/src/sys/compat/mach/mach_thread.c:220
#11 0xffffffff80948f22 in thread_fini (mem=0xfffff8002ba6b940,
    size=<value optimized out>) at /usr/src/sys/kern/kern_thread.c:226
#12 0xffffffff80baa683 in zone_drain_wait (zone=0xfffff8023ffb2000,
    waitok=<value optimized out>) at /usr/src/sys/vm/uma_core.c:820
#13 0xffffffff80bae0cd in uma_reclaim () at /usr/src/sys/vm/uma_core.c:925
#14 0xffffffff80bc9035 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:945
#15 0xffffffff8090814a in fork_exit (callout=0xffffffff80bc8cd0 <vm_pageout>,
    arg=0x0, frame=0xfffffe0238176ac0) at /usr/src/sys/kern/kern_fork.c:1021
#16 0xffffffff80d1042e in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:611
#17 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal
(kgdb)