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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - segfault at 234 error 4 in i915_dri.so"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100189#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - segfault at 234 error 4 in i915_dri.so"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100189">bug 100189</a>
from <span class="vcard"><a class="email" href="mailto:emil.l.velikov@gmail.com" title="Emil Velikov <emil.l.velikov@gmail.com>"> <span class="fn">Emil Velikov</span></a>
</span></b>
<pre>(In reply to Javi Ballester Tomás from <a href="show_bug.cgi?id=100189#c3">comment #3</a>)
<span class="quote">> Hi Emil.
> The upgrade that initiated the problem was (17.0~git1701100730.17eac3~gd~x,
> 17.1~git1702040730.106a51~gd~x), something happened between 170110 and
> 170204.
> </span >
Perfect - what you're looking for is "how to use git bisect". There's dozens of
sources out there - from `git help bisect' (in the command line) to the Wine
example [1]. In case you're wondering - Mesa source tree is located at [2]
Note that you will need to rebuild and test mesa ~10 times. Make sure to use
exact same build (configure) flags as your distro.
[1] <a href="https://wiki.winehq.org/Regression_Testing#Running_the_bisection">https://wiki.winehq.org/Regression_Testing#Running_the_bisection</a>
[2] <a href="https://cgit.freedesktop.org/mesa/mesa">https://cgit.freedesktop.org/mesa/mesa</a>
(In reply to Javi Ballester Tomás from <a href="show_bug.cgi?id=100189#c4">comment #4</a>)
<span class="quote">> "LIBGL_ALWAYS_SOFTWARE=1 blender" works. Blender runs without errors. Also
> Mpv, glmark2 and glxgears.</span >
This is very good step - it tells us that the software rasteriser is working
fine.
I.e. the variable 'disables' the GPU driver and makes the CPU do all the heavy
lifting.</pre>
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