[Webkit-unassigned] [Bug 230572] [ Mac ] TestWebKitAPI.Challenge.DeallocateDuringChallenge flakily crashes under DisplayLink::notifyObserversDisplayWasRefreshed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230572

Alexey Proskuryakov <ap at webkit.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sabouhallawa at apple.com,
                   |                            |simon.fraser at apple.com,
                   |                            |thorton at apple.com
            Summary|[ Mac ]                     |[ Mac ]
                   |TestWebKitAPI.Challenge.Dea |TestWebKitAPI.Challenge.Dea
                   |llocateDuringChallenge is a |llocateDuringChallenge
                   |flaky crash                 |flakily crashes under
                   |                            |DisplayLink::notifyObserver
                   |                            |sDisplayWasRefreshed

--- Comment #2 from Alexey Proskuryakov <ap at webkit.org> ---
Divide by zero!

Crashed Thread:        14  CVDisplayLink

Exception Type:        EXC_ARITHMETIC (SIGFPE)
Exception Codes:       EXC_I386_DIV (divide by zero)
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Floating point exception: 8
Termination Reason:    Namespace SIGNAL, Code 0x8
Terminating Process:   exc handler [81187]

...

Thread 14 Crashed:: CVDisplayLink
0   com.apple.WebKit                    0x000000010be4fab6 WebKit::DisplayLink::notifyObserversDisplayWasRefreshed() + 302 (DisplayLink.cpp:243)
1   com.apple.WebKit                    0x000000010be4f0f6 WebKit::DisplayLink::displayLinkCallback(__CVDisplayLink*, CVTimeStamp const*, CVTimeStamp const*, unsigned long long, unsigned long long*, void*) + 12 (DisplayLink.cpp:207)
2   com.apple.CoreVideo                 0x7fff2729114a CVDisplayLink::performIO(CVTimeStamp*) + 230 (/System/Volumes/Data/SWE/macOS/BuildRoots/e90674e518/Library/Caches/com.apple.xbs/Sources/CoreVideo/CoreVideo-414.7/CoreVideo/DisplayLink/CVDisplayLinkInternal.cpp:1087)
3   com.apple.CoreVideo                 0x7fff27290579 CVDisplayLink::runIOThread() + 623 (/System/Volumes/Data/SWE/macOS/BuildRoots/e90674e518/Library/Caches/com.apple.xbs/Sources/CoreVideo/CoreVideo-414.7/CoreVideo/DisplayLink/CVDisplayLinkInternal.cpp:922)
4   libsystem_pthread.dylib             0x7fff2034b8fc _pthread_start + 224 (/System/Volumes/Data/SWE/macOS/BuildRoots/e90674e518/Library/Caches/com.apple.xbs/Sources/libpthread/libpthread-454.120.2/src/pthread.c:887)
5   libsystem_pthread.dylib             0x7fff20347443 thread_start + 15

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