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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 - ASSERTION FAILED: m_transactionOperationsInProgressQueue.first() == &amp;operation"
   href="https://bugs.webkit.org/show_bug.cgi?id=165166">165166</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: m_transactionOperationsInProgressQueue.first() == &amp;operation
          </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>New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ryanhaddad&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Seen with LayoutTest storage/indexeddb/modern/handle-user-delete.html

<a href="https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK2%20(Tests)/r209088%20(9640)/results.html">https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK2%20(Tests)/r209088%20(9640)/results.html</a>

ASSERTION FAILED: m_transactionOperationsInProgressQueue.first() == &amp;operation
/Volumes/Data/slave/elcapitan-debug/build/Source/WebCore/Modules/indexeddb/IDBTransaction.cpp(1293) : void WebCore::IDBTransaction::operationCompletedOnClient(IDBClient::TransactionOperation &amp;)
1   0x10bb6eae0 WTFCrash
2   0x10f10410d WebCore::IDBTransaction::operationCompletedOnClient(WebCore::IDBClient::TransactionOperation&amp;)
3   0x10f108bce WebCore::IDBClient::TransactionOperation::doComplete(WebCore::IDBResultData const&amp;)
4   0x10f0fac5f WebCore::IDBTransaction::completedOperationTimerFired()
5   0x10f113068 void std::__1::__invoke_void_return_wrapper&lt;void&gt;::__call&lt;std::__1::__bind&lt;void (WebCore::IDBTransaction::*&amp;)(), WebCore::IDBTransaction*&gt;&amp;&gt;(std::__1::__bind&lt;void (WebCore::IDBTransaction::*&amp;)(), WebCore::IDBTransaction*&gt;&amp;&amp;&amp;)
6   0x10f112f3c std::__1::__function::__func&lt;std::__1::__bind&lt;void (WebCore::IDBTransaction::*&amp;)(), WebCore::IDBTransaction*&gt;, std::__1::allocator&lt;std::__1::__bind&lt;void (WebCore::IDBTransaction::*&amp;)(), WebCore::IDBTransaction*&gt; &gt;, void ()&gt;::operator()()
7   0x10e27fd5a std::__1::function&lt;void ()&gt;::operator()() const
8   0x10e27fc6c WebCore::Timer::fired()
9   0x110ba7eea WebCore::ThreadTimers::sharedTimerFiredInternal()
10  0x110ba9131 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const
11  0x110ba90fd void std::__1::__invoke_void_return_wrapper&lt;void&gt;::__call&lt;WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0&amp;&gt;(WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0&amp;&amp;&amp;)
12  0x110ba909c std::__1::__function::__func&lt;WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, std::__1::allocator&lt;WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0&gt;, void ()&gt;::operator()()
13  0x10e27fd5a std::__1::function&lt;void ()&gt;::operator()() const
14  0x10fe77d2f WebCore::MainThreadSharedTimer::fired()
15  0x10fe78139 WebCore::timerFired(__CFRunLoopTimer*, void*)
16  0x7fff97244b94 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
17  0x7fff97244823 __CFRunLoopDoTimer
18  0x7fff9724437a __CFRunLoopDoTimers
19  0x7fff9723b871 __CFRunLoopRun
20  0x7fff9723aed8 CFRunLoopRunSpecific
21  0x7fff968fc935 RunCurrentEventLoopInMode
22  0x7fff968fc76f ReceiveNextEventCommon
23  0x7fff968fc5af _BlockUntilNextEventMatchingListInModeWithFilter
24  0x7fff88577df6 _DPSNextEvent
25  0x7fff88577226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
26  0x7fff8856bd80 -[NSApplication run]
27  0x7fff88535368 NSApplicationMain
28  0x7fff8db63194 _xpc_objc_main
29  0x7fff8db61bbe xpc_main
30  0x106f4a080 main
31  0x7fff895dc5ad start</pre>
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