MacOS hangs on shutdown with pool with vdev file still alive

[captain-haddock17]

Short Story

Condition: With a still active/present vdev file as pool

when asking to shutdown or reboot my system, MacOS hangs forver...

Have to push 10 sec. the power-button

clue

• Shouldn't there be a LaunchAgent for shutdown ?
  • zpool export -a
• maybe a race condition on the APFS main filesystem, while ZFS file is still in use ?
  • file /vdev/zTest.dat

Workaround

• do a manual zpool export -a before shuting down/rebooting

Test case

1. Create zpool mkdir /vdev dd bs=4096 count=131072 if=/dev/zero of=/vdev/zTest.dat zpool create zTest /vdev/zTest.dat
2. shutdown (or reboot) MacOS through regular Apple menu

Config MacBook Air (2012) with SSD (APFS) - macOS 10.14.6 (18G4032)/ Darwin 18.7.0 sysctl {spl,zfs}.kext_version

spl.kext_version: 1.9.4-0 zfs.kext_version: 1.9.4-0

[captain-haddock17]

Some possible solutions i've read over the web:

• Launchd script with trap trap myShutdown SIGTERM trap myShutdown SIGKILL
• substute the /sbin/shutdown with a script (calling the real shutdown)
• creating a C (or whatever) program that could register himself for an XPC event
  • called from a Launchd

Ref :

• Run a script only at shutdown (not log off or restart) on Mac OS X

[sosise]

I've got the same problem as author has described, any suggestions?