[Bug 229986] Virtualbox + zfs scrub + gstat leads to deadlock

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229986

--- Comment #2 from Martin Birgmeier <d8zNeCFG at aon.at> ---
I just noticed that the same hang happens when trying to stop the ctld.

Scenario:
- Machine recently upgrade to 11.2, but with https://reviews.freebsd.org/D7538
because of excessive swapping
- Machine with raidz2 pool with 6 1.5 TB partitions
- Machine acts as iSCSI server to remote VirtualBox instances
- Run "zpool scrub" on the pool
- In another terminal window, gstat is running
- Stop the iSCSI server using "service ctld stop"

Result:
- gstat hangs
- "service ctld stop" does not terminate

Expected result:
- gstat should continue running
- "service ctld stop" should return

Scenario continued:
- Pause the scrub with "zpool scrub -p"

Result:
- After a few seconds, gstat continues and "service ctld stop" terminates

Remark:
- Both the VBox client running directly on the machine as well as the ctld
serve zvols, so maybe it is related to that.

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