kgdb) list *0xffffffff8228c918
0xffffffff8228c918 is in trim_map_seg_compare
(/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/trim_map.c:108).
103    trim_map_seg_compare(const void *x1, const void *x2)
104    {
105        const trim_seg_t *s1 = x1;
106        const trim_seg_t *s2 = x2;
107
108        if (s1->ts_start < s2->ts_start) {
109            if (s1->ts_end > s2->ts_start)
110                return (0);
111            return (-1);
112        }
Current language:  auto; currently minimal
(kgdb) bt
#0  doadump (textdump=<value optimized out>) at pcpu.h:221
#1  0xffffffff80ad8e69 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:366
#2  0xffffffff80ad941b in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80ad9253 in panic (fmt=0x0) at
/usr/src/sys/kern/kern_shutdown.c:690
#4  0xffffffff80fa0d31 in trap_fatal (frame=0xfffffe02374957f0,
eva=4294967343) at /usr/src/sys/amd64/amd64/trap.c:841
#5  0xffffffff80fa0f23 in trap_pfault (frame=0xfffffe02374957f0,
usermode=0) at /usr/src/sys/amd64/amd64/trap.c:691
#6  0xffffffff80fa04cc in trap (frame=0xfffffe02374957f0) at
/usr/src/sys/amd64/amd64/trap.c:442
#7  0xffffffff80f84141 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#8  0xffffffff8228c918 in trim_map_seg_compare (x1=0xfffffe0237495920,
x2=0x100000007) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/trim_map.c:108
#9  0xffffffff821a98e1 in avl_find (tree=<value optimized out>,
value=<value optimized out>, where=0x0) at
/usr/src/sys/cddl/contrib/opensolaris/common/avl/avl.c:268
#10 0xffffffff8228ce9e in trim_map_write_start (zio=<value optimized out>)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/trim_map.c:363
#11 0xffffffff822592df in zio_vdev_io_start (zio=0xfffff802191ea000) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:2866
#12 0xffffffff82255b26 in zio_execute (zio=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1556
#13 0xffffffff822551e9 in zio_nowait (zio=0xfffff802191ea000) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1610
#14 0xffffffff8223c738 in vdev_queue_io_done (zio=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c:884
#15 0xffffffff822594a9 in zio_vdev_io_done (zio=0xfffff8006daad000) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:2895
#16 0xffffffff82255b26 in zio_execute (zio=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1556
#17 0xffffffff80b363ca in taskqueue_run_locked (queue=<value optimized
out>) at /usr/src/sys/kern/subr_taskqueue.c:449
#18 0xffffffff80b372d8 in taskqueue_thread_loop (arg=<value optimized out>)
at /usr/src/sys/kern/subr_taskqueue.c:703
#19 0xffffffff80a90055 in fork_exit (callout=0xffffffff80b371f0
<taskqueue_thread_loop>, arg=0xfffff8001006b920, frame=0xfffffe0237495c00)
at /usr/src/sys/kern/kern_fork.c:1038
#20 0xffffffff80f8467e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:611
#21 0x0000000000000000 in ?? ()
(kgdb) up 8
#8  0xffffffff8228c918 in trim_map_seg_compare (x1=0xfffffe0237495920,
x2=0x100000007) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/trim_map.c:108
108        if (s1->ts_start < s2->ts_start) {

But my last crash had a different message:

(kgdb) list *0xffffffff80b3a89c
0xffffffff80b3a89c is in turnstile_broadcast
(/usr/src/sys/kern/subr_turnstile.c:837).
832
833        /*
834         * Transfer the blocked list to the pending list.
835         */
836        mtx_lock_spin(&td_contested_lock);
837        TAILQ_CONCAT(&ts->ts_pending, &ts->ts_blocked[queue], td_lockq);
838        mtx_unlock_spin(&td_contested_lock);
839
840        /*
841         * Give a turnstile to each thread.  The last thread gets
Current language:  auto; currently minimal
(kgdb) bt
#0  doadump (textdump=<value optimized out>) at pcpu.h:221
#1  0xffffffff80ad8e69 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:366
#2  0xffffffff80ad941b in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80ad9253 in panic (fmt=0x0) at
/usr/src/sys/kern/kern_shutdown.c:690
#4  0xffffffff80fa0d31 in trap_fatal (frame=0xfffffe0237384870, eva=48) at
/usr/src/sys/amd64/amd64/trap.c:841
#5  0xffffffff80fa0f23 in trap_pfault (frame=0xfffffe0237384870,
usermode=0) at /usr/src/sys/amd64/amd64/trap.c:691
#6  0xffffffff80fa04cc in trap (frame=0xfffffe0237384870) at
/usr/src/sys/amd64/amd64/trap.c:442
#7  0xffffffff80f84141 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#8  0xffffffff80b3a89c in turnstile_broadcast (ts=0x0, queue=1) at
/usr/src/sys/kern/subr_turnstile.c:837
#9  0xffffffff80ad48cf in __rw_wunlock_hard (c=0xfffff8024f3c2960,
tid=<value optimized out>, file=<value optimized out>, line=<value
optimized out>)
   at /usr/src/sys/kern/kern_rwlock.c:1027
#10 0xffffffff80e1a75c in vm_map_delete (map=<value optimized out>,
start=<value optimized out>, end=<value optimized out>) at
/usr/src/sys/vm/vm_map.c:2960
#11 0xffffffff80e1828e in vmspace_exit (td=<value optimized out>) at
/usr/src/sys/vm/vm_map.c:3077
#12 0xffffffff80a88686 in exit1 (td=0xfffff80015533a00, rval=268849920,
signo=0) at /usr/src/sys/kern/kern_exit.c:398
#13 0xffffffff80a87e1d in sys_sys_exit (td=0x0, uap=<value optimized out>)
at /usr/src/sys/kern/kern_exit.c:178
#14 0xffffffff80fa168e in amd64_syscall (td=<value optimized out>,
traced=0) at subr_syscall.c:135
#15 0xffffffff80f8442b in Xfast_syscall () at
/usr/src/sys/amd64/amd64/exception.S:396
#16 0x0000000800b661aa in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) up 8
#8  0xffffffff80b3a89c in turnstile_broadcast (ts=0x0, queue=1) at
/usr/src/sys/kern/subr_turnstile.c:837
837        TAILQ_CONCAT(&ts->ts_pending, &ts->ts_blocked[queue], td_lockq);