[Nouveau] [Bug 94694] New: Attempt to use kde/plasma renders the system immediately unresponsive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94694

            Bug ID: 94694
           Summary: Attempt to use kde/plasma renders the system
                    immediately unresponsive
           Product: Mesa
           Version: 11.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: oakad at yahoo.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 122538
  --> https://bugs.freedesktop.org/attachment.cgi?id=122538&action=edit
Xorg.0.log for the failed session

The crux of the problem: 

Mar 25 23:40:25 mercador kernel: nouveau 0000:01:00.0: plasmashell[6208]:
failed
 to idle channel 17 [plasmashell[6208]]
Mar 25 23:40:27 mercador kernel: nouveau 0000:01:00.0: timeout at
drivers/gpu/dr
m/nouveau/nvkm/engine/fifo/gpfifogf100.c:66/gf100_fifo_gpfifo_engine_fini()!
Mar 25 23:40:27 mercador kernel: nouveau 0000:01:00.0: fifo: channel 17
[plasmas
hell[6208]] kick timeout
Mar 25 23:40:27 mercador kernel: nouveau: plasmashell[6208]:00000000:0000906f:
d
etach gr failed, -16
Mar 25 23:40:27 mercador kernel: nouveau 0000:01:00.0: fifo: SCHED_ERROR 0d []
Mar 25 23:40:29 mercador kernel: nouveau 0000:01:00.0: timeout at
drivers/gpu/dr
m/nouveau/nvkm/engine/fifo/gpfifogf100.c:66/gf100_fifo_gpfifo_engine_fini()!
Mar 25 23:40:29 mercador kernel: nouveau 0000:01:00.0: fifo: channel 17
[plasmas
hell[6208]] kick timeout
Mar 25 23:40:29 mercador kernel: nouveau: plasmashell[6208]:00000000:0000906f:
d
etach sw failed, -16
Mar 25 23:40:44 mercador kernel: nouveau 0000:01:00.0: plasmashell[6208]:
failed
 to idle channel 17 [plasmashell[6208]]

This will happen immediately upon any interaction with KDE 5 panel.

At this moment system is rendered inoperable, even though it may still possible
to reboot it over network. The CPU usage becomes high, apparently being
consumed by an in-kernel thread.

The kernel version is 4.4.6
Kde/plasma version is 5.19.0, qt is 5.5.1
X11/nouveau driver version is 1.0.12

Xorg.0.log is attached (with some additional errors signalling that event queue
is filling up).

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