[Qemu-devel] [Bug 1728256] Re: Memory corruption in Windows 10 guest / amd64

From: Tyler Doherty <1728256@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1728256] Re: Memory corruption in Windows 10 guest / amd64
Date: Tue, 21 Nov 2017 20:53:02 -0000	[thread overview]
Message-ID: <151129758247.18705.6495511163995730205.malone@gac.canonical.com> (raw)
In-Reply-To: 150920686502.20214.12572544661418580428.malonedeb@soybean.canonical.com

I am on Arch as well, using a customized kernel using the vfio patchset
(in this case 4.13.11). I was having the same issue as you guys, where
my Windows 10 VM with an NVIDIA card passed in was getting the
CRITICAL_STRUCTURE_CORRUPTION blue screen error message after running
for a while. Usually I saw this when hitting some form of memory (GPU or
system RAM), and it was quick (~3 hours) to crash while mining on the
GPU (as that hits the GPU memory hard).

It looks like what Jimi said above about swap seeming to be a
contributing factor seems to be correct. I have disabled swap on my host
and have seen no instability thus far.

Windows 7 also may be seeing similar issues, though it was just crashing
though without displaying an error as far as I could see. This VM has an
AMD card in it. Same goes for it, where it also has not crashed after
more than a day after disabling swap.

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https://bugs.launchpad.net/bugs/1728256

Title:
  Memory corruption in Windows 10 guest / amd64

Status in QEMU:
  New

Bug description:
  I have a Win 10 Pro x64 guest inside a qemu/kvm running on an Arch x86_64 host. The VM has a physical GPU passed through, as well as the physical USB controllers, as well as a dedicated SSD attached via SATA; you can find the complete libvirt xml here: https://pastebin.com/U1ZAXBNg
  I built qemu from source using the qemu-minimal-git AUR package; you can find the build script here: https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=qemu-minimal-git (if you aren't familiar with Arch, this is essentially a bash script where build() and package() are run to build the files, and then install them into the $pkgdir to later tar them up.)

  Starting with qemu v2.10.0, Windows crashes randomly with a bluescreen
  about CRITICAL_STRUCTURE_CORRUPTION. I also tested the git heads
  f90ea7ba7c, 861cd431c9 and e822e81e35, before I went back to v2.9.0,
  which is running stable for over 50 hours right now.

  During my tests I found that locking the memory pages alleviates the
  problem somewhat, but never completely avoids it. However, with the
  crashes occuring randomly, that could as well be false conclusions; I
  had crashes within minutes after boot with that too.

  I will now start `git bisect`ing; if you have any other suggestions on
  what I could try or possible patches feel free to leave them with me.

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