[Bug 73619] New: XServer frequently freezes for a few seconds

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=73619

          Priority: medium
            Bug ID: 73619
          Assignee: dri-devel@lists.freedesktop.org
           Summary: XServer frequently freezes for a few seconds
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: arichardson.kde@gmail.com
          Hardware: Other
            Status: NEW
           Version: 10.0
         Component: Drivers/DRI/R600
           Product: Mesa

The XServer randomly freezes for a few seconds or sometimes even 1-2 minutes. I
cannot move the mouse, and the screen does not update.

I have a HD4850 card running on a 
3.12.6-1.g080d0df-desktop SMP PREEMPT x86_64 kernel with Mesa 10.0.1 (both from
openSuSE packages). These freezes also happen with the default 3.11 kernel, I
upgraded in the hope of it being fixed, but the issue is still present.

These issues started after the upgrade to openSuSE 13.1 which has a 3.11 kernel
instead of the previous 3.7 kernel. The Mesa version did not change, I was
always running the latest released version. My guess is it has something to do
with the r600 kernel changes in 3.8+.

During these freeze periods I can ssh into my system and top shows no CPU
usage, so the XServer seems to be sleeping instead of being in a busy loop.
dmesg gives me no messages and /var/log/XOrg.0.log is also empty.

I don't know how to get any more detailed logging output. If you provide me
with the necessary environment variables/kernel parameters I will give you
these logs.

Not sure if this helps, but most of the time the freeze happens when I open a
new tab in firefox or switch to a different one. However it also happens at
random intervals using other programs.
It can sometimes take quite a long time until this freeze happens, however once
it has occured once, it usually happens again after a short timespan (1-2
minutes or even less).

Is it possible to debug the XServer just like a normal program using gdb? If
yes I will try to provide a useful backtrace once the next longer freeze
happens

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