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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 - Simulator launch fails intermittently due to failure in checking simulator boot status"
   href="https://bugs.webkit.org/show_bug.cgi?id=157965">157965</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Simulator launch fails intermittently due to failure in checking simulator boot status
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Local 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>Tools / Tests
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>aakash_jain&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>lforschler&#64;apple.com
          </td>
        </tr></table>
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        <pre>see &lt;rdar://problem/26402404&gt;

e.g.:
CalledProcessError raised: Command '['xcrun', 'simctl', 'spawn', u'C2F98E0E-D6DF-48B1-BA58-B530ABFB7FF7', 'launchctl', 'print', 'system']' returned non-zero exit status -6
Traceback (most recent call last):
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py&quot;, line 77, in main
    run_details = run(port, options, args, stderr)
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py&quot;, line 409, in run
    run_details = manager.run(args)
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py&quot;, line 205, in run
    if not self._set_up_run(tests_to_run):
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py&quot;, line 179, in _set_up_run
    self._port.setup_test_run()
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/port/ios.py&quot;, line 239, in setup_test_run
    Simulator.wait_until_device_is_booted(self.testing_device(i).udid)
  File &quot;~/OpenSource/Tools/Scripts/webkitpy/xcode/simulator.py&quot;, line 281, in wait_until_device_is_booted
    state = subprocess.check_output(['xcrun', 'simctl', 'spawn', udid, 'launchctl', 'print', 'system']).strip()
  File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py&quot;, line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
CalledProcessError: Command '['xcrun', 'simctl', 'spawn', u'C2F98E0E-D6DF-48B1-BA58-B530ABFB7FF7', 'launchctl', 'print', 'system']' returned non-zero exit status -6</pre>
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