If you attempt to remove any log devices that are active and imported, you get the following...
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*** Panic Report ***
panic(cpu 6 caller 0xffffff7f9b08bbc6): "mutex_enter: locking against myself!"@spl-mutex.c:290
Backtrace (CPU 6), Frame : Return Address
0xffffff942c0b3960 : 0xffffff801a8ec3ec
0xffffff942c0b39e0 : 0xffffff7f9b08bbc6
0xffffff942c0b3a00 : 0xffffff7f9c2efa7c
0xffffff942c0b3a40 : 0xffffff7f9c2cb6ad
0xffffff942c0b3aa0 : 0xffffff7f9c2fb95a
0xffffff942c0b3ad0 : 0xffffff7f9c2ff77e
0xffffff942c0b3b60 : 0xffffff801ab563d3
0xffffff942c0b3b90 : 0xffffff801ab4b87e
0xffffff942c0b3c10 : 0xffffff801ab3d124
0xffffff942c0b3e10 : 0xffffff801ad5349b
0xffffff942c0b3e40 : 0xffffff801ad9df73
0xffffff942c0b3f50 : 0xffffff801ae25695
0xffffff942c0b3fb0 : 0xffffff801a89dd46
Kernel Extensions in backtrace:
net.lundman.spl(1.6.1)[52421600-30A3-3DD8-805C-4EA84362E240]@0xffffff7f9b080000->0xffffff7f9c275fff
net.lundman.zfs(1.6.1)[CD22A326-A364-3B9C-8169-581C8559F853]@0xffffff7f9c276000->0xffffff7f9c523fff
dependency: com.apple.iokit.IOStorageFamily(2.1)[F908D7F5-4F54-3B89-8657-57F06350F4DB]@0xffffff7f9b050000
dependency: net.lundman.spl(1.6.1)[52421600-30A3-3DD8-805C-4EA84362E240]@0xffffff7f9b080000
BSD process name corresponding to current thread: zpool
Mac OS version:
16E195
Kernel version:
Darwin Kernel Version 16.5.0: Fri Mar 3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64
Kernel UUID: 06F94FD7-451F-34A1-B13C-D68FF7EDE0A0
Kernel slide: 0x000000001a600000
Kernel text base: 0xffffff801a800000
__HIB text base: 0xffffff801a700000