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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>kworker consumes 100% of one CPU core after kernel upgrade from 5.2.14 to 5.3
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>not set
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>val.kulkov@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <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>
        </div>
      </p>


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