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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 - Modern IDB: Prevent the same transaction from being commited/aborted twice"
   href="https://bugs.webkit.org/show_bug.cgi?id=157494">157494</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Modern IDB: Prevent the same transaction from being commited/aborted twice
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>WebCore Misc.
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>beidson&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Modern IDB: Prevent the same transaction from being commited/aborted twice

Rarely, due to page navigation or worker shutdown, a transaction might be either committed or aborted after it has already been committed or aborted.

I could not reproduce this with a targeted test case attempting to reproduce it, but it is showing up as a source of at least some of the mysterious flakes (<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Modern IDB: Test flakes and failures umbrella"
   href="show_bug.cgi?id=154968">https://bugs.webkit.org/show_bug.cgi?id=154968</a>)

By detecting this situation and turning it into an explicit error, we'll turn at least some mysterious timeouts into errors that will then become more actionable.</pre>
        </div>
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