Can you provide some details about the stack trace when you hit this
failure. All of the ms_freetrees should be empty by the time you can
range_tree_destroy(). So to debug this we need to understand the calling
stack to determine why that isn't happening.
The stack at the moment of the VERIFY0() triggered panic is:
Aug 27 03:26:24 big-vm-mac kernel[0]: ZFS: rt->rt_space is !0 : space
6144 from metaslab.c:1982
Aug 27 03:26:24 big-vm-mac kernel[0]: zfs: 2103296 (512)
Aug 27 03:26:24 big-vm-mac kernel[0]: zfs: 2125824 (1024)
Aug 27 03:26:24 big-vm-mac kernel[0]: zfs: 2128896 (2560)
Aug 27 03:26:24 big-vm-mac kernel[0]: zfs: 2144256 (2048)
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: backtrace "range_tree_destroy"
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a06738e0 :
0xffffff7fa4c0471e net.lundman.zfs : _range_tree_destroy + 0x6e
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673900 :
0xffffff7fa4c00510 net.lundman.zfs : _metaslab_fini + 0x140
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673940 :
0xffffff7fa4c2b804 net.lundman.zfs : _vdev_metaslab_fini + 0x84
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673970 :
0xffffff7fa4c2b453 net.lundman.zfs : _vdev_free + 0x83
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a06739a0 :
0xffffff7fa4c2b425 net.lundman.zfs : _vdev_free + 0x55
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a06739d0 :
0xffffff7fa4c1121f net.lundman.zfs : _spa_unload + 0x11f
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a06739f0 :
0xffffff7fa4c1363a net.lundman.zfs : _spa_export_common + 0x29a
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673a30 :
0xffffff7fa4c13395 net.lundman.zfs : _spa_destroy + 0x25
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673a50 :
0xffffff7fa4c65b2e net.lundman.zfs : _zfs_ioc_pool_destroy + 0x1e
Aug 27 03:26:24 big-vm-mac kernel[0]: SPL: 0xffffff88a0673a70 :
0xffffff7fa4c622fc net.lundman.zfs : _zfsdev_ioctl + 0x66c
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