[164936] Uptime: 1d21h48m56s
[164937]
[164937]
[164937] Fatal trap 9: general protection fault while in kernel mode
[164937] cpuid = 8; apic id = 08
[164937] instruction pointer    = 0x20:0xffffffff80b70534
[164937] stack pointer          = 0x28:0xfffffe009f13f950
[164937] frame pointer          = 0x28:0xfffffe009f13f980
[164937] code segment           = base 0x0, limit 0xfffff, type 0x1b
[164937]                        = DPL 0, pres 1, long 1, def32 0, gran 1
[164937] processor eflags       = interrupt enabled, resume, IOPL = 0
[164937] current process                = 0 (dbu_evict)

__curthread () at ./machine/pcpu.h:230
230             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb)
(kgdb)
(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0x1) at /srv/src/fbsd/head/sys/kern/kern_shutdown.c:361
#2  0xffffffff80435f4c in db_fncall_generic (addr=<optimized out>, rv=<optimized out>, nargs=<optimized out>, args=<optimized out>)
    at /srv/src/fbsd/head/sys/ddb/db_command.c:609
#3  db_fncall (dummy1=<optimized out>, dummy2=<optimized out>, dummy3=<optimized out>, dummy4=<optimized out>) at /srv/src/fbsd/head/sys/ddb/db_command.c:657
#4  0xffffffff80435a89 in db_command (last_cmdp=<optimized out>, cmd_table=<optimized out>, dopager=<optimized out>)
    at /srv/src/fbsd/head/sys/ddb/db_command.c:481
#5  0xffffffff80435804 in db_command_loop () at /srv/src/fbsd/head/sys/ddb/db_command.c:534
#6  0xffffffff80438a3f in db_trap (type=<optimized out>, code=<optimized out>) at /srv/src/fbsd/head/sys/ddb/db_main.c:250
#7  0xffffffff80bad613 in kdb_trap (type=0x9, code=0x0, tf=<optimized out>) at /srv/src/fbsd/head/sys/kern/subr_kdb.c:697
#8  0xffffffff810271c1 in trap_fatal (frame=0xfffffe009f13f890, eva=0x0) at /srv/src/fbsd/head/sys/amd64/amd64/trap.c:819
#9  0xffffffff8102683d in trap (frame=0xfffffe009f13f890) at /srv/src/fbsd/head/sys/amd64/amd64/trap.c:200
#10 <signal handler called>
#11 _sx_xlock (sx=0xdeadc0dedeadd47e, opts=0x0, file=0xffffffff82784d62 "/srv/src/fbsd/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c",
    line=0xa2) at /srv/src/fbsd/head/sys/kern/kern_sx.c:320
#12 0xffffffff8269dcaa in refcount_remove_many (rc=0xdeadc0dedeadd47e, number=0x1, holder=0xfffff8004333c400)
    at /srv/src/fbsd/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c:162
#13 0xffffffff8267245c in dsl_dir_evict_async (dbu=0xfffff8004333c400) at /srv/src/fbsd/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c:158
#14 0xffffffff80bc0abc in taskqueue_run_locked (queue=0xfffff80039092300) at /srv/src/fbsd/head/sys/kern/subr_taskqueue.c:465
#15 0xffffffff80bc1888 in taskqueue_thread_loop (arg=<optimized out>) at /srv/src/fbsd/head/sys/kern/subr_taskqueue.c:757
#16 0xffffffff80b28344 in fork_exit (callout=0xffffffff80bc1800 <taskqueue_thread_loop>, arg=0xfffff800041860c0, frame=0xfffffe009f13fac0)
    at /srv/src/fbsd/head/sys/kern/kern_fork.c:1039
#17 <signal handler called>