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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][BAT] igt@i915_selftest@live_sanitycheck - incomplete - BUG: unable to handle kernel (paging request|NULL pointer dereference) at"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108799">bug 108799</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI][BAT] igt@i915_selftest@live_sanitycheck - incomplete - BUG: unable to handle kernel (paging request|NULL pointer dereference) at"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108799#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [CI][BAT] igt@i915_selftest@live_sanitycheck - incomplete - BUG: unable to handle kernel (paging request|NULL pointer dereference) at"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108799">bug 108799</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>commit dafdf69736d66075836b7bc291584cd0889e7601 (HEAD -> topic/core-for-CI,
drm-intel/topic/core-for-CI)
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri May 12 12:45:25 2017 +0100
perf/core: Avoid removing shared pmu_context on unregister
In commit 1fd7e4169954 ("perf/core: Remove perf_cpu_context::unique_pmu"),
the search for another user of the pmu_cpu_context was removed, and so
we unconditionally free it during perf_pmu_unregister. This leads to
random corruption later and a BUG at mm/percpu.c:689.
v2: Check for shared pmu_contexts under the mutex.
Fixes: 1fd7e4169954 ("perf/core: Remove perf_cpu_context::unique_pmu")
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Cc: David Carrillo-Cisneros <<a href="mailto:davidcc@google.com">davidcc@google.com</a>>
Cc: Peter Zijlstra (Intel) <<a href="mailto:peterz@infradead.org">peterz@infradead.org</a>>
Cc: Ingo Molnar <<a href="mailto:mingo@redhat.com">mingo@redhat.com</a>>
Cc: <<a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>> # v4.11+
Link:
<a href="http://patchwork.freedesktop.org/patch/msgid/20170512114525.17575-1-chris@chris-wilson.co.uk">http://patchwork.freedesktop.org/patch/msgid/20170512114525.17575-1-chris@chris-wilson.co.uk</a></pre>
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