[Nouveau] [Bug 105722] New: Nouveau driver hangs when closing video playback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105722

            Bug ID: 105722
           Summary: Nouveau driver hangs when closing video playback
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: freedesktopbugs0000 at cneufeld.ca
        QA Contact: xorg-team at lists.x.org

Created attachment 138322
  --> https://bugs.freedesktop.org/attachment.cgi?id=138322&action=edit
Kernel log from bootup to crash

I have a completely reproducible hang in the nouveau kernel module.  It happens
when I've run a vdpau or OpenGL video session and then exit it, under the KDE5
desktop.  It doesn't happen under KDE4, with the same binaries and libraries.

I start the MythTV frontend (fullscreen) or xine (windowed) from within KDE5. 
Playback is normal, everything works properly, until I attempt to exit
playback.  At that moment, the screen locks up.  The keyboard becomes
non-responsive, the mouse cursor still moves, my desktop clocks stop updating,
and I have to ssh into the machine to reboot it.

I'm attaching the Xorg and dmesg logs.  The end of the dmesg log includes some
lines from the kernel log, retrieved after the reboot.  The relevant lines are:

kernel: nouveau 0000:01:00.0: msvld: intr 00000002
kernel: nouveau 0000:01:00.0: mythfrontend[2971]: failed to idle channel 19
[mythfrontend[2971]]
kernel: nouveau 0000:01:00.0: mythfrontend[2971]: failed to idle channel 19
[mythfrontend[2971]]
kernel: nouveau 0000:01:00.0: fifo: runlist update timeout
kernel: nouveau 0000:01:00.0: fifo: INTR 00000001: 0000000b

The Mesa/DRI libraries are at version 17.3.3, but this happened with earlier
versions as well.  My kernel is kernel.org 4.14.12 with no additional patches.

The xf86-video-nouveau component is at tag xf86-video-nouveau-1.0.15
The xserver component is at tag xorg-server-1.19.5

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