I have now identified the same problem on ZFS-FUSE as on OpenSolaris svn_134:

[New Thread 0x7fa90e838950 (LWP 29241)]
[New Thread 0x7fa55950 (LWP 29242)]

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x67224950 (LWP 29041)]
0x00007fa90faa6ed5 in raise () from /lib/libc.so.6
(gdb) 
(gdb) 
(gdb) 
(gdb) ba
#0  0x00007fa90faa6ed5 in raise () from /lib/libc.so.6
#1  0x00007fa90faa83f3 in abort () from /lib/libc.so.6
#2  0x00000000004fe130 in vpanic (fmt=0x528ea8 "zfs: allocating allocated 
segment(offset=%llu size=%llu)\n", adx=0x672239d0) at 
lib/libsolkerncompat/cmn_err.c:53
#3  0x00000000004fe25e in vcmn_err (ce=3, fmt=0x528ea8 "zfs: allocating 
allocated segment(offset=%llu size=%llu)\n", adx=0x672239d0) at 
lib/libsolkerncompat/cmn_err.c:73
#4  0x00000000004999cf in zfs_panic_recover (fmt=0x528ea8 "zfs: allocating 
allocated segment(offset=%llu size=%llu)\n") at lib/libzpool/spa_misc.c:1185
#5  0x000000000049ae07 in space_map_add (sm=0x7fa90d268650, start=422941467136, 
size=8192) at lib/libzpool/space_map.c:102
#6  0x000000000049bef2 in space_map_load (sm=0x7fa90d268650, ops=0x7a2860, 
maptype=1 '\001', smo=0x7fa90d268030, os=0x7fa910f6dc40) at 
lib/libzpool/space_map.c:326
#7  0x000000000048391c in metaslab_activate (msp=0x7fa90d268000, 
activation_weight=4611686018427387904, size=512) at lib/libzpool/metaslab.c:860
#8  0x0000000000484c59 in metaslab_group_alloc (mg=0x7fa90e868f10, size=512, 
txg=400585, min_distance=93759373312, dva=0x7fa90d1c8a80, d=1) at 
lib/libzpool/metaslab.c:1211
#9  0x00000000004850db in metaslab_alloc_dva (spa=0x7fa910f80000, 
mc=0x7fa910fa2e80, psize=512, dva=0x7fa90d1c8a80, d=1, hintdva=0x0, txg=400585, 
flags=0) at lib/libzpool/metaslab.c:1354
#10 0x0000000000485c5f in metaslab_alloc (spa=0x7fa910f80000, 
mc=0x7fa910fa2e80, psize=512, bp=0x7fa90d1c8a80, ndvas=2, txg=400585, 
hintbp=0x0, flags=0) at lib/libzpool/metaslab.c:1537
#11 0x00000000004d78db in zio_dva_allocate (zio=0x7fa8e7adfba0) at 
lib/libzpool/zio.c:2126
#12 0x00000000004d3b58 in zio_execute (zio=0x7fa8e7adfba0) at 
lib/libzpool/zio.c:1162
#13 0x0000000000505bf9 in taskq_thread (arg=0x7fa910f85120) at 
lib/libsolkerncompat/taskq.c:1376
#14 0x00007fa9109a6fc7 in start_thread () from /lib/libpthread.so.0
#15 0x00007fa90fb4464d in clone () from /lib/libc.so.6
#16 0x0000000000000000 in ?? ()
(gdb)
-- 
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