[Bug 102301] Shutting down a Windowvs 10 virtual machine (with VGA passthrough) causes a hard crash, every time

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https://bugzilla.kernel.org/show_bug.cgi?id=102301

--- Comment #5 from Michael Long <harn-solo@gmx.de> ---
I'm also affected by this problem but haven't found a pattern to reproduce the
problem yet.

My observation is, that in former kernel versions, the shutdown problem was on
every 10th shutdown but with kernel 4.3 it occurs like every 3rd shutdown,
although sometimes I can shutdown and start the Windows 10 VM (still build
10240) several times in a row without issue.

Kernel versions: 4.1.x - 4.4-rcX
Qemu: 2.4.0, 2.4.1

Pass through devices:

VGA compatible controller: NVIDIA Corporation GM204 [GeForce GTX 980] (rev a1)
USB controller: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller (rev
03)

I've attached two stack traces, captured by using a serial connection. I would
confirm Balázs' observation that the system is not hard locked because the
watchdog kicks in over and over until a reset.

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