unRAID stuck trying to unmount VM share

[theone]

Recently I am having trouble stopping array and/or shutting it down.

Each time I try I get 300 seconds timeout (when shutting down) due to VM share not being able to unmount.

May 20 23:42:23 Tower emhttpd: Unmounting disks...
May 20 23:42:23 Tower emhttpd: shcmd (181): umount /mnt/virtual_machines
May 20 23:42:23 Tower root: umount: /mnt/virtual_machines: target is busy.
May 20 23:42:23 Tower emhttpd: shcmd (181): exit status: 32
May 20 23:42:23 Tower emhttpd: Retry unmounting disk share(s)...
May 20 23:42:28 Tower emhttpd: Unmounting disks...
May 20 23:42:28 Tower emhttpd: shcmd (182): umount /mnt/virtual_machines
May 20 23:42:28 Tower root: umount: /mnt/virtual_machines: target is busy.
May 20 23:42:28 Tower emhttpd: shcmd (182): exit status: 32
May 20 23:42:28 Tower emhttpd: Retry unmounting disk share(s)...

 

The VM service did manage to turn off and I can't remote access my VM:

 

Using the "Open Files" plugin I can see the following:

 

Tried to kill but nothing happens:

 

Ran kill 23133 from command line (terminal) and array immediately stopped.

 

What is it that prevents the disk from unmounting?

 

 

[Squid]

Was the VM doing anything ? Updates etc...   personally I always set my VMs to hibernate upon array shutdown and installed the qemu guest tools to avoid those problems