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[Qemu-devel] [Bug 1580459] Re: Windows (10?) guest freezes entire host o

From: Gandalf-The-Red
Subject: [Qemu-devel] [Bug 1580459] Re: Windows (10?) guest freezes entire host on shutdown if using PCI passthrough
Date: Sat, 28 May 2016 18:31:18 -0000

I see, it's definitely the same issue then.

Could it be something to do with our hardware unbinding and binding pci
devices or something of the sort? I sort of doubt it but it is strange
someone else with a more different CPU/mobo combo hasn't reported this
problem yet.

That being said, we have a very small sample size so I don't know if
that means anything.

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  Windows (10?) guest freezes entire host on shutdown if using PCI

Status in QEMU:
Status in Debian:
Status in Fedora:

Bug description:
  Problem: after leaving a Windows VM that uses PCI passthrough (as we
  do for gaming graphics cards, sound cards, and in my case, a USB card)
  running for some amount of time between 1 and 2 hours (it's not
  consistent with exactly how long), and for any amount of time longer
  than that, shutting down that guest will, right as it finishes
  shutting down, freeze the host computer, making it require a hard
  reboot. Unbinding (or in the other user's case, unbinding and THEN
  binding) any PCI device in sysfs, even one that has nothing to do with
  the VM, also has the same effect as shutting down the VM (if the VM
  has been running long enough). So, it's probably an issue related to
  unbinding and binding PCI devices.

  There's a lot of info on this problem over at 
  Here's a better-organized list of main details:
  -at least 2 confirmed victims of this bug; 2 (including me) have provided 
lots of info in the link
  -I'm on Arch Linux and the other one is on Gentoo (distro-nonspecific)
  -issue affects my Windows 10 guest and others' Windows guests, but not my 
Arch Linux guest (the others don't have non-Windows guests to test)
  -I'm using libvirt but the other user is not, so it's not an issue with 
  -It seems to be version non-specific, too. I first noticed it at, or when 
testing versions still had the issue at (whichever version is lower), Linux 4.1 
and qemu 2.4.0. It still persists in all releases of both since, including the 
newest ones.
  -I can't track down exactly what package downgrade can fix it, as downgrading 
further than Linux 4.1 and qemu 2.4.0 requires Herculean and system-destroying 
changes such as downgrading ncurses, meaning I don't know whether it's a bug in 
QEMU, the Linux kernel, or some weird seemingly unrelated thing.
  -According to the other user, "graphics intensive gameplay (GTA V) can cause 
the crash to happen sooner," as soon as "15 minutes"
  -Also, "bringing up a second passthrough VM with separate hardware will cause 
the same crash," and "bringing up another VM before the two-hour mark will not 
result in a crash," further cementing that it's triggered by the un/binding of 
PCI devices.
  -This is NOT related to the very similar bug that can be worked around by not 
passing through the HDMI device or sound card. Even when we removed all traces 
of any sort of sound card from the VM, it still had the same behavior.

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