ZFS destroy caused panic ? 11.2 (r335771)

[Mike Tancsa]

I got the following panic while deleting a test snapshot

panic: unprotected error in call to Lua API (Invalid value type
'function' for key 'error')

cpuid = 4
KDB: stack backtrace:
#0 0xffffffff806fb437 at kdb_backtrace+0x67
#1 0xffffffff806b4a57 at vpanic+0x177
#2 0xffffffff806b48d3 at panic+0x43
#3 0xffffffff814500e4 at zcp_panic_cb+0x24
#4 0xffffffff8149b591 at luaD_throw+0x31
#5 0xffffffff814a4042 at luaG_errormsg+0x72
#6 0xffffffff814ae109 at lua_error+0x9
#7 0xffffffff8144f376 at zcp_convert_return_values+0x96
#8 0xffffffff8144ff4f at zcp_eval+0x71f
#9 0xffffffff813fe9f1 at dsl_destroy_snapshots_nvl+0x1b1
#10 0xffffffff81478644 at zfs_ioc_destroy_snaps+0x164
#11 0xffffffff8147f269 at zfsdev_ioctl+0x6f9
#12 0xffffffff80582418 at devfs_ioctl_f+0x128
#13 0xffffffff807174bd at kern_ioctl+0x26d
#14 0xffffffff807171dc at sys_ioctl+0x15c
#15 0xffffffff80945078 at amd64_syscall+0xa38
#16 0xffffffff80923cfd at fast_syscall_common+0x101

I was not able to get a backtrace saved.  Any ideas what this might be
about ?
-- 
-------------------
Mike Tancsa, tel +1 519 651 3400 x203
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada