[Bug 102339] QXL driver hangs on virt guest login, kernel 4.12

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102339

            Bug ID: 102339
           Summary: QXL driver hangs on virt guest login, kernel 4.12
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: high
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: chuckebbert.lk at gmail.com

>From https://bugzilla.redhat.com/show_bug.cgi?id=1481365

Description of problem:
Using KVM, QXL driver emits error message over and over, I never get to my home
screen. It seems to be happening while attempting to switch resolution. Another
user reports that everything works if he uses 1024x768.

Version-Release number of selected component (if applicable):
4.12.5

Steps to Reproduce:
1. Remove "rhgb" from kernel command line because of a possibly different QXL
bug (don't have the link right now.)
2. Boot into graphical mode under KVM. Login screen appears, try to log in.
3. Desktop never appears. System log keeps getting these messages:

Aug 13 14:03:40 localhost-live kernel: f 4026531862#140: failed to wait on
release 22 after spincount 301
Aug 13 14:03:41 localhost-live kernel: f 4026531862#140: failed to wait on
release 22 after spincount 301
Aug 13 14:03:41 localhost-live kernel: f 4026531862#140: failed to wait on
release 22 after spincount 301
Aug 13 14:03:41 localhost-live kernel: f 4026531864#142: failed to wait on
release 24 after spincount 301
Aug 13 14:03:42 localhost-live kernel: f 4026531864#142: failed to wait on
release 24 after spincount 301
Aug 13 14:03:42 localhost-live kernel: f 4026531864#142: failed to wait on
release 24 after spincount 301

Message is from drivers/gpu/drm/qxl/qxl_release.c::qxl_fence_wait()

DMA fence operations are timing out.

System can be shut down normally from the VM monitor, it's not frozen. The VM
is only usable in text console mode.

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