Kernel panic with 8TB SMR drive

kpanic

(kgdb) bt
#0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff80959ce2 in kern_reboot (howto=260) at /usr/git/freebsd-10.3/sys/kern/kern_shutdown.c:486
#2  0xffffffff8095a0c5 in vpanic (fmt=<value optimized out>, ap=<value optimized out>) at /usr/git/freebsd-10.3/sys/kern/kern_shutdown.c:889
#3  0xffffffff80959f53 in panic (fmt=0x0) at /usr/git/freebsd-10.3/sys/kern/kern_shutdown.c:818
#4  0xffffffff80df97eb in trap_fatal (frame=<value optimized out>, eva=<value optimized out>) at /usr/git/freebsd-10.3/sys/amd64/amd64/trap.c:858
#5  0xffffffff80df9aed in trap_pfault (frame=0xfffffe044f7d1fe0, usermode=<value optimized out>) at /usr/git/freebsd-10.3/sys/amd64/amd64/trap.c:681
#6  0xffffffff80df916a in trap (frame=0xfffffe044f7d1fe0) at /usr/git/freebsd-10.3/sys/amd64/amd64/trap.c:447
#7  0xffffffff80ddf142 in calltrap () at /usr/git/freebsd-10.3/sys/amd64/amd64/exception.S:236
#8  0xffffffff80f16b57 in __bus_dmamap_waitok (dmat=0xfffff800067bac00, map=0xfffff800067b5f00, mem=0xfffffe044f7d20c0, callback=0xffffffff803a3b00 <ahci_dmasetprd>, callback_arg=0xfffffe0000b303b8)
    at /usr/git/freebsd-10.3/sys/x86/x86/busdma_machdep.c:327
#9  0xffffffff809923c5 in bus_dmamap_load_ccb (dmat=0xfffff800067bac00, map=0xfffff800067b5f00, ccb=0xfffff80043b2c800, callback=0xffffffff803a3b00 <ahci_dmasetprd>, 
    callback_arg=0xfffffe0000b303b8, flags=0) at /usr/git/freebsd-10.3/sys/kern/subr_bus_dma.c:445
#10 0xffffffff802f1ce1 in xpt_run_devq (devq=0xfffff800067a4140) at /usr/git/freebsd-10.3/sys/cam/cam_xpt.c:3311
#11 0xffffffff802f24fc in xpt_release_devq (path=<value optimized out>, count=<value optimized out>, run_queue=<value optimized out>) at /usr/git/freebsd-10.3/sys/cam/cam_xpt.c:4377
#12 0xffffffff802f15ea in xpt_action_default (start_ccb=0xfffffe044f7d2248) at /usr/git/freebsd-10.3/sys/cam/cam_xpt.c:2952
#13 0xffffffff802edca9 in cam_release_devq (path=0xfffff800067b5f00, relsim_flags=0, openings=0, arg=0, getcount_only=0) at /usr/git/freebsd-10.3/sys/cam/cam_periph.c:1158
#14 0xffffffff802ff892 in probedone (periph=<value optimized out>, done_ccb=<value optimized out>) at /usr/git/freebsd-10.3/sys/cam/ata/ata_xpt.c:710
#15 0xffffffff802f55bd in xpt_done_process (ccb_h=0xfffff80043b2c800) at /usr/git/freebsd-10.3/sys/cam/cam_xpt.c:5275
#16 0xffffffff802f8976 in xpt_done_td (arg=0xffffffff815c8c80) at /usr/git/freebsd-10.3/sys/cam/cam_xpt.c:5302
#17 0xffffffff8092350a in fork_exit (callout=0xffffffff802f8850 <xpt_done_td>, arg=0xffffffff815c8c80, frame=0xfffffe044f7d2ac0) at /usr/git/freebsd-10.3/sys/kern/kern_fork.c:1027
#18 0xffffffff80ddf67e in fork_trampoline () at /usr/git/freebsd-10.3/sys/amd64/amd64/exception.S:611
#19 0x0000000000000000 in ?? ()