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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 - Web Inspector: CRASH under WebInspectorProxy::closeTimerFired"
   href="https://bugs.webkit.org/show_bug.cgi?id=141713">141713</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Web Inspector: CRASH under WebInspectorProxy::closeTimerFired
          </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>All
          </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>Web Inspector
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>burg@cs.washington.edu
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>graouts@webkit.org, joepeck@webkit.org, jonowells@apple.com, mattbaker@apple.com, nvasilyev@apple.com, timothy@apple.com, webkit-bug-importer@group.apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>How this seems to happen for me:

1. Run debug build
2. Open Inspector
3. Inspector process crashes (for me, at ASSERTION FAILED: m_cachedThreadGlobalTimerHeap)
(?)
4. UIProcess tries to close the WKWebView after a timeout
(?)
5. Crash


Relevant call frames:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore          0x000000010099323a WTFCrash + 42
1   com.apple.WebKit                  0x000000010224d7cb WebKit::PageLoadState::removeObserver(WebKit::PageLoadState::Observer&) + 91 (PageLoadState.cpp:78)
2   com.apple.WebKit                  0x0000000102162c57 WebKit::NavigationState::~NavigationState() + 391 (NavigationState.mm:97)
3   com.apple.WebKit                  0x0000000102162cb5 WebKit::NavigationState::~NavigationState() + 21 (NavigationState.mm:98)
4   com.apple.WebKit                  0x0000000102162cd9 WebKit::NavigationState::~NavigationState() + 25 (NavigationState.mm:93)
5   com.apple.WebKit                  0x00000001029bc895 -[WKWebView .cxx_destruct] + 565 (memory:2625)
6   libobjc.A.dylib                   0x00007fff8d5a1ae8 object_cxxDestructFromClass(objc_object*, objc_class*) + 127
7   libobjc.A.dylib                   0x00007fff8d59c637 objc_destructInstance + 119
8   libobjc.A.dylib                   0x00007fff8d59c595 object_dispose + 22
9   com.apple.AppKit                  0x00007fff97a1bb8c -[NSResponder dealloc] + 139
10  com.apple.AppKit                  0x00007fff97a19bfd -[NSView dealloc] + 182
11  com.apple.WebKit                  0x00000001029ba7e5 -[WKWebView dealloc] + 309 (WKWebView.mm:392)
12  libobjc.A.dylib                   0x00007fff8d5b689c objc_object::sidetable_release(bool) + 236
13  com.apple.CoreFoundation          0x00007fff8e3f09c0 CFRelease + 304
14  com.apple.WebKit                  0x000000010262b6fe WTF::RetainPtr<WKWebInspectorWKWebView>::~RetainPtr() + 46 (RetainPtr.h:74)
15  com.apple.WebKit                  0x0000000102625ae5 WTF::RetainPtr<WKWebInspectorWKWebView>::~RetainPtr() + 21 (RetainPtr.h:74)
16  com.apple.WebKit                  0x00000001026325ea WTF::RetainPtr<WKWebInspectorWKWebView>::operator=(WKWebInspectorWKWebView*) + 74 (RetainPtr.h:187)
17  com.apple.WebKit                  0x000000010262e10a WebKit::WebInspectorProxy::closeTimerFired() + 298 (WebInspectorProxyMac.mm:318)
18  com.apple.WebKit                  0x000000010262b97e WTF::RunLoop::Timer<WebKit::WebInspectorProxy>::fired() + 110 (RunLoop.h:121)
19  com.apple.JavaScriptCore          0x00000001009cf2a9 WTF::RunLoop::TimerBase::timerFired(__CFRunLoopTimer*, void*) + 57
20  com.apple.CoreFoundation          0x00007fff8e48db64 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
21  com.apple.CoreFoundation          0x00007fff8e48d7f3 __CFRunLoopDoTimer + 1059
22  com.apple.CoreFoundation          0x00007fff8e500dbd __CFRunLoopDoTimers + 301
23  com.apple.CoreFoundation          0x00007fff8e44a288 __CFRunLoopRun + 2024
24  com.apple.CoreFoundation          0x00007fff8e449858 CFRunLoopRunSpecific + 296
25  com.apple.HIToolbox               0x00007fff8c070aef RunCurrentEventLoopInMode + 235
26  com.apple.HIToolbox               0x00007fff8c07086a ReceiveNextEventCommon + 431
27  com.apple.HIToolbox               0x00007fff8c0706ab _BlockUntilNextEventMatchingListInModeWithFilter + 71
28  com.apple.AppKit                  0x00007fff979d4f81 _DPSNextEvent + 964
29  com.apple.AppKit                  0x00007fff979d4730 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
30  com.apple.Safari.framework        0x00007fff8a884710 -[BrowserApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 246
31  com.apple.AppKit                  0x00007fff979c8593 -[NSApplication run] + 594
32  com.apple.AppKit                  0x00007fff979b3a14 NSApplicationMain + 1832
33  libdyld.dylib                     0x00007fff8d5915c9 start + 1</pre>
        </div>
      </p>
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      <ul>
          <li>You are the assignee for the bug.</li>
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