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      <base href="https://bugs.webkit.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 - UITextSelection setRangedSelectionBaseToCurrentSelection message sent to deallocated instance"
   href="https://bugs.webkit.org/show_bug.cgi?id=146488">146488</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>UITextSelection setRangedSelectionBaseToCurrentSelection message sent to deallocated instance
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>528+ (Nightly build)
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>iOS
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>wenpkpk&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=255889" name="attach_255889" title="crash stack">attachment 255889</a> <a href="attachment.cgi?id=255889&amp;action=edit" title="crash stack">[details]</a></span>
crash stack

uiwebview load a page contains some input、textarea, and click or switch they quickly,some times it crashed. The debug console outputs
[UITextSelection setRangedSelectionBaseToCurrentSelection] message sent to deallocated instance</pre>
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