[Bug 196685] New: System becomes unresponsive after intel_iommu kernel error

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https://bugzilla.kernel.org/show_bug.cgi?id=196685

            Bug ID: 196685
           Summary: System becomes unresponsive after intel_iommu kernel
                    error
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.12.7
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: jaszhix@gmail.com
        Regression: No

Created attachment 257969
  --> https://bugzilla.kernel.org/attachment.cgi?id=257969&action=edit
Kernel error in /var/log/kern.log

I using a qemu virtual machine with VGA pass through. I have two Intel NICs in
use by my motherboard, and I am passing through one of them so I can network
with the VM over gigabit ethernet. I have been using this without issues for
several months, but recently my system started becoming unstable. Before each
crash, the network connection would abruptly end, and I suspect that is related
to this. My desktop environment locks up, and after logging into my user
account in another terminal, it is flooded with UFW block messages and no
commands using sudo return anything. A kernel error appearing to be caused by
intel_iommu is left in the kernel log. After this has happened yesterday, I ran
memtest86 and my memory is okay. I am using an engineering sample CPU that is a
down-clocked Intel E5 2680 v4. I haven't had any issues with this chip except
recently when using VT-d.

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