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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - KWin crashed when Alt+Tab-ing through open windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103234#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - KWin crashed when Alt+Tab-ing through open windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103234">bug 103234</a>
from <span class="vcard"><a class="email" href="mailto:nhaehnle@gmail.com" title="Nicolai Hähnle <nhaehnle@gmail.com>"> <span class="fn">Nicolai Hähnle</span></a>
</span></b>
<pre>Thank you for the report!
Can you try with Mesa from git master?
The issue is that in Mesa 17.2.2 (which you have according to glxinfo),
si_state_draw.c:1305 corresponds to
1304 index_offset -= start_offset;
1305 } else if (sctx->b.chip_class <= CIK &&
1306 r600_resource(indexbuf)->TC_L2_dirty) {
and it's basically impossible to get a crash there, so I suspect the Gentoo
build actually applies some other patches.
Something random you could try is starting KWin with GALLIUM_THREAD=0.</pre>
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