[ubuntu-x] Hangs in x-swat's mesa 17.3.3-0ubuntu1~16.04.1 with radeon ?

[Dan Kegel]

Hi!
I updated to x-swat's mesa 17.3.3-0ubuntu1~16.04.1 on January 31, and
lately I've been seeing hangs on two ubuntu 16.04 machines with ATI W600
cards.
The symptom is

Mar 22 17:37:30 rbb-Mar 22 17:44:50 rbb-ubu1604-4 kernel: [  651.223122]
radeon 0000:01:00.0: GPU lockup (current fence id 0x00000000000000e5 last
fence id 0x00000000000000e9 on ring 0)
Mar 22 17:44:51 rbb-ubu1604-4 kernel: [  651.723032] radeon 0000:01:00.0:
ring 0 stalled for more than 10500msec

I guess I'll try dropping x-swat on one machine, this was just
opportunistic testing.

Want more info?
- Dan

P.s.

$ uname -s
Linux rbb-ubu1604-4.oblong.com 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12
21:23:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux


buildbot at rbb-ubu1604-4:~$ dpkg-query -l | grep mesa
ii  libegl1-mesa:amd64                         17.3.3-0ubuntu1~16.04.1
                amd64        free implementation of the EGL API -- runtime
ii  libgl1-mesa-dri:amd64                      17.3.3-0ubuntu1~16.04.1
                amd64        free implementation of the OpenGL API -- DRI
modules
ii  libgl1-mesa-glx:amd64                      17.3.3-0ubuntu1~16.04.1
                amd64        free implementation of the OpenGL API -- GLX
runtime
ii  libglapi-mesa:amd64                        17.3.3-0ubuntu1~16.04.1
                amd64        free implementation of the GL API -- shared
library
ii  libglu1-mesa:amd64                         9.0.0-2.1
                amd64        Mesa OpenGL utility library (GLU)
ii  libwayland-egl1-mesa:amd64                 17.3.3-0ubuntu1~16.04.1
                amd64        implementation of the Wayland EGL platform --
runtime
ii  mesa-utils                                 8.3.0-1
                amd64        Miscellaneous Mesa GL utilities
buildbot at rbb-ubu1604-4:~$ apt-cache policy libgl1-mesa-dri
libgl1-mesa-dri:
  Installed: 17.3.3-0ubuntu1~16.04.1
  Candidate: 17.3.3-0ubuntu1~16.04.1
  Version table:
 *** 17.3.3-0ubuntu1~16.04.1 500
        500 http://ppa.launchpad.net/ubuntu-x-swat/updates/ubuntu
xenial/main amd64 Packages
        100 /var/lib/dpkg/status
     17.2.8-0ubuntu0~16.04.1 500
        500 http://ubuntu.oblong.com/ubuntu xenial-updates/main amd64
Packages
     11.2.0-1ubuntu2 500
        500 http://ubuntu.oblong.com/ubuntu xenial/main amd64 Package
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