[Bug 231251] [ZFS assfail] 12-ALPHA5 r338529 panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231251

--- Comment #18 from Jeremy Faulkner <gldisater at gmail.com> ---
Panic'd during daily's again, panic is different from earlier and makes more
sense in the context of SMR drives. 

Loaded symbols for /boot/kernel/fdescfs.ko
#0  doadump () at src/sys/amd64/include/pcpu.h:230
230             __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
(OFFSETOF_CURTHREAD));
(kgdb) #0  doadump () at src/sys/amd64/include/pcpu.h:230
#1  0xffffffff80bc19e7 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:451
#2  0xffffffff80bc1e49 in vpanic (fmt=<value optimized out>,
    ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:877
#3  0xffffffff80bc1c43 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:804
#4  0xffffffff827c6fe9 in vdev_deadman (vd=<value optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:4369
#5  0xffffffff827c6ea1 in vdev_deadman (vd=0xfffff80986498000)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:4345
#6  0xffffffff827c6ea1 in vdev_deadman (vd=0xfffff80986393000)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c:4345
#7  0xffffffff827b7903 in spa_deadman (arg=0xfffffe00c623a000,
    pending=<value optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c:666
#8  0xffffffff80c1ff64 in taskqueue_run_locked (queue=0xfffff80104525100)
    at /usr/src/sys/kern/subr_taskqueue.c:467
#9  0xffffffff80c21288 in taskqueue_thread_loop (arg=<value optimized out>)
    at /usr/src/sys/kern/subr_taskqueue.c:773
#10 0xffffffff80b82dc2 in fork_exit (
    callout=0xffffffff80c211f0 <taskqueue_thread_loop>,
    arg=0xffffffff8200b8b0, frame=0xfffffe0075daac00)
    at /usr/src/sys/kern/kern_fork.c:1060
#11 0xffffffff81075c1e in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:995
#12 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal
(kgdb)

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