I have a report from a FreeBSD user that 7578 caused a problem for him and that
the change in this PR fixes it.
His panic was different from what was reported here.
He got "zfs: allocating allocated segment" in this stack:
```
(kgdb) backtrace
#0 doadump (textdump=1) at pcpu.h:222
#1 0xffffffff807c80c6 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:366
#2 0xffffffff807c85a0 in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
#3 0xffffffff807c83d3 in panic (fmt=<value optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:690
#4 0xffffffff81d15192 in vcmn_err (ce=<value optimized out>,
fmt=0xffffffff81b3e673 "zfs: allocating allocated segment(offset=%llu
size=%llu)\n",
adx=0xfffffe201b3df810) at
/usr/src/sys/cddl/compat/opensolaris/kern/opensolaris_cmn_err.c:58
#5 0xffffffff81a843ba in zfs_panic_recover (fmt=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c:1595
#6 0xffffffff81a6cf8f in range_tree_add (arg=0xfffff801cd085400,
start=51596307456, size=2048)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/range_tree.c:179
#7 0xffffffff81a6bb06 in metaslab_free_dva (spa=<value optimized out>,
dva=<value optimized out>, txg=<value optimized out>, now=0) at atomic.h:123
#8 0xffffffff81a6bbc1 in metaslab_free (spa=0xfffff8031275d000,
bp=0xfffff80200f08820, txg=8777, now=0)
at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c:2851
#9 0xffffffff81aaf96a in zio_dva_free (zio=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:2897
#10 0xffffffff81aac6cc in zio_execute (zio=0xfffff80200f087b0) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1681
#11 0xffffffff8081c377 in taskqueue_run_locked (queue=0xfffff8024e085700) at
/usr/src/sys/kern/subr_taskqueue.c:454
#12 0xffffffff8081d518 in taskqueue_thread_loop (arg=<value optimized out>) at
/usr/src/sys/kern/subr_taskqueue.c:741
```
His test case was:
1. zfs create -s -V 50T -o logbias=throughput -o volmode=dev -o
volblocksize=128k -o compression=lz4 -o dedup=off -o secondarycache=all -o
sync=standard zpool/windows
2. exported the LUN via cam layer as an FC target
3. Formated from windows 2012 r2 with 64K blok size NTFS
4. run iometer read test...
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