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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_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI] igt@gem_* - incomplete - GEM_BUG_ON(buf[2 * head + 1] != port->context_id) - kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:869!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104945">bug 104945</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI] igt@gem_* - incomplete - GEM_BUG_ON(buf[2 * head + 1] != port->context_id) - kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:869!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104945#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI] igt@gem_* - incomplete - GEM_BUG_ON(buf[2 * head + 1] != port->context_id) - kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:869!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104945">bug 104945</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>Found a related bug,
commit 963ddd63c314e9b5d9cd999873d473a93aed5380
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Mar 2 11:33:24 2018 +0000
drm/i915: Suspend submission tasklets around wedging
where the port->context_id was being reset with tasklet in flight on wedging.
Which then uncovered the problem in <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI] igt@gem_eio@in-flight-external - incomplete - i915_gem_find_active_request:2880 GEM_BUG_ON((__builtin_constant_p((DMA_FENCE_FLAG_SIGNALED_BIT)) ? constant_test_bit((DMA_FENCE_FLAG_SIGNALED_BIT), (&request->fence.flags)) : variable_test_bit((DMA_FENCE"
href="show_bug.cgi?id=105341">bug 105341</a> (previously seen in the kasan
runs). I _think_ this GEM_BUG_ON(CSB[] != port->context_id) is resolved. Just
the can of worms got larger.</pre>
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