'NTOSKRNL work queue deadlock' after exiting NTVDM or command.com

I can make this happen in 0.4.6rc1 gcc dbg and trunk 75707 gcc dbg.

I just start the game POP2 via NTVDM (which immediately exits - this has never been different in the past)

But what happens then is a really bad thing:
The black NTVDM window is still visible when Win32K plays two iterations 'Looping Louie' and then we run into a full
NTOSKRNL Work Queue Deadlock detected
I can not interact with the system any longer.
Not even ACPI-shutdown works at this point anymore.

I can make this happen with at least 4 of 5tries.
r75707.log
I waited 18minutes in the hope it would break into debugger automatically maybe, but it didn't.

I tested: this is a regression: r73532 is guilty/unhider