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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - kworker consumes 100% of one CPU core after kernel upgrade from 5.2.14 to 5.3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112125">112125</a>
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<th>Summary</th>
<td>kworker consumes 100% of one CPU core after kernel upgrade from 5.2.14 to 5.3
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>not set
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>val.kulkov@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>A kernel upgrade from 5.2.* to 5.3.* results in 100% usage of one of the
available CPU cores. Comparing the output of /proc/interrupts before and after
upgrade reveals that upon such upgrade:
- the number of i915 interrupts increases by a factor of 59,
- the number of local timer interrupts increases by a factor of 24, and
- the number of rescheduling interrupts increases by a factor of 6.
Bisecting kernel from 5.2 to 5.3 identifies commit
6cfe7ec02e854278fb341e62db54d49a2b199c62 as the culprit:
<a href="https://github.com/torvalds/linux/commit/6cfe7ec02e854278fb341e62db54d49a2b199c62">https://github.com/torvalds/linux/commit/6cfe7ec02e854278fb341e62db54d49a2b199c62</a>
Full details are available at
<a href="https://bbs.archlinux.org/viewtopic.php?pid=1869944">https://bbs.archlinux.org/viewtopic.php?pid=1869944</a></pre>
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</p>
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