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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [gen4] Batch buffer overwritten"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88727">bug 88727</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Summary</td>
<td>[drm] GPU HANG ecode 0:0x00ababab, in systemd-logind [248], reason: Ring hung, action: reset
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<td>[gen4] Batch buffer overwritten
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [gen4] Batch buffer overwritten"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88727#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [gen4] Batch buffer overwritten"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88727">bug 88727</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>There are a few cachelines worth of pixel data inside the batchbuffer - which
is what the GPU hung on. The writes within the batches, up to the hang at
least, are all contained within their respective target surfaces and shouldn't
be the source of the scribbling. The batch doesn't overlap a fence register. It
is not clear how we could end up with corruption in the middle of the batch.
All I can ask is that you keep filing the error state in case one captures a
clear violation, and if you could build debug packages of X, xf86-video-intel,
mesa, the additional self-checks may find the culprit.</pre>
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