[Webkit-unassigned] [Bug 182888] New: Crash in: com.apple.WebCore: WebCore::InspectorInstrumentation::instrumentingAgentsForFrame + 21

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182888

            Bug ID: 182888
           Summary: Crash in: com.apple.WebCore:
                    WebCore::InspectorInstrumentation::instrumentingAgents
                    ForFrame + 21
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jlewis3 at apple.com
                CC: joepeck at webkit.org, mattbaker at apple.com,
                    webkit at devinrousso.com

The following layout test is flaky on macOS.

storage/indexeddb/detached-iframe.html

There doesn't seem to be a clear regression point, however sometimes there is what looks to be a truncated backtrace on the crash

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=storage%2Findexeddb%2Fdetached-iframe.html

https://build.webkit.org/results/Apple%20High%20Sierra%20Debug%20WK1%20(Tests)/r228565%20(2428)/results.html
https://build.webkit.org/builders/Apple%20High%20Sierra%20Debug%20WK1%20(Tests)/builds/2428


backtrace:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                   0x0000000116a49b6c WebCore::Frame::page() const + 12 (Frame.h:374)
1   com.apple.WebCore                   0x0000000117fcf1e5 WebCore::InspectorInstrumentation::instrumentingAgentsForFrame(WebCore::Frame&) + 21 (InspectorInstrumentation.h:1412)
2   com.apple.WebCore                   0x0000000118c80c36 WebCore::InspectorInstrumentation::didDispatchPostMessage(WebCore::Frame&, WebCore::TimerBase&) + 54 (InspectorInstrumentation.h:730)
3   com.apple.WebCore                   0x0000000118c80937 WebCore::DOMWindow::postMessageTimerFired(WebCore::PostMessageTimer&) + 551 (DOMWindow.cpp:995)
4   com.apple.WebCore                   0x0000000118c92b11 WebCore::PostMessageTimer::fired() + 353 (DOMWindow.cpp:176)
5   com.apple.WebCore                   0x0000000118eb5bf4 WebCore::ThreadTimers::sharedTimerFiredInternal() + 452 (ThreadTimers.cpp:118)
6   com.apple.WebCore                   0x0000000118ecbee1 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const + 33 (ThreadTimers.cpp:70)
7   com.apple.WebCore                   0x0000000118ecbe99 WTF::Function<void ()>::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0>::call() + 25 (Function.h:101)
8   com.apple.WebCore                   0x0000000116653bdb WTF::Function<void ()>::operator()() const + 139 (Function.h:56)
9   com.apple.WebCore                   0x0000000118e8ec25 WebCore::MainThreadSharedTimer::fired() + 101 (MainThreadSharedTimer.cpp:55)
10  com.apple.WebCore                   0x0000000118f31e79 WebCore::timerFired(__CFRunLoopTimer*, void*) + 41 (MainThreadSharedTimerCF.cpp:74)
11  com.apple.CoreFoundation            0x7fff2853c0a4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20 (~rc/Software/LoboChipmunkSeed/Projects/Foundation/Foundation-1450.16/CoreFoundation/RunLoop.subproj/CFRunLoop.c:1832)
12  com.apple.CoreFoundation            0x7fff2853bd24 __CFRunLoopDoTimer + 1108 (~rc/Software/LoboChipmunkSeed/Projects/Foundation/Foundation-1450.16/CoreFoundation/RunLoop.subproj/CFRunLoop.c:2415)
13  com.apple.CoreFoundation            0x7fff2853b81a __CFRunLoopDoTimers + 346 (~rc/Software/LoboChipmunkSeed/Projects/Foundation/Foundation-1450.16/CoreFoundation/RunLoop.subproj/CFRunLoop.c:2562)
14  com.apple.CoreFoundation            0x7fff28532feb __CFRunLoopRun + 2427 (~rc/Software/LoboChipmunkSeed/Projects/Foundation/Foundation-1450.16/CoreFoundation/RunLoop.subproj/CFRunLoop.c:3086)
15  com.apple.CoreFoundation            0x7fff285323d7 CFRunLoopRunSpecific + 487 (~rc/Software/LoboChipmunkSeed/Projects/Foundation/Foundation-1450.16/CoreFoundation/RunLoop.subproj/CFRunLoop.c:3245)
16  DumpRenderTree                      0x000000010baca9fe runTest(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 7022 (DumpRenderTree.mm:1988)
17  DumpRenderTree                      0x000000010bac8de3 runTestingServerLoop() + 403 (DumpRenderTree.mm:1156)
18  DumpRenderTree                      0x000000010bac82f2 dumpRenderTree(int, char const**) + 402 (DumpRenderTree.mm:1254)
19  DumpRenderTree                      0x000000010bacb43d DumpRenderTreeMain(int, char const**) + 125 (DumpRenderTree.mm:1369)
20  DumpRenderTree                      0x000000010bb4a632 main + 34 (DumpRenderTreeMain.mm:34)
21  libdyld.dylib                       0x00007fff4fed8115 start + 1

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