[Webkit-unassigned] [Bug 230807] New: [ Catalina Debug wk1 EWS ] Media tests flakily crashing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230807

            Bug ID: 230807
           Summary: [ Catalina Debug wk1 EWS ] Media tests flakily
                    crashing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ehutchison at apple.com

Created attachment 439296

  --> https://bugs.webkit.org/attachment.cgi?id=439296&action=review

Crash Log

media/media-source/media-source-append-before-last-range-no-quota-exceeded.html
media/media-source/media-source-remove.html 

are flaky crashes on Catalina Debug wk1 EWS.

History: https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=media%2Fmedia-source%2Fmedia-source-append-before-last-range-no-quota-exceeded.html&test=media%2Fmedia-source%2Fmedia-source-remove.html

Results: https://ews-build.s3-us-west-2.amazonaws.com/macOS-Catalina-Debug-WK1-Tests-EWS/r439294-16070/results.html, https://ews-build.s3-us-west-2.amazonaws.com/macOS-Catalina-Debug-WK1-Tests-EWS/r439294-16070-rerun/results.html

Crash Log: Attached

Thread 1 Crashed:: JavaScriptCore bmalloc scavenger
0   com.apple.JavaScriptCore            0x000000010f997e06 bmalloc::Heap::decommitLargeRange(std::__1::unique_lock<bmalloc::Mutex>&, bmalloc::LargeRange&, bmalloc::BulkDecommit&) + 486 (Heap.cpp:146)
1   com.apple.JavaScriptCore            0x000000010f9986dc bmalloc::Heap::scavenge(std::__1::unique_lock<bmalloc::Mutex>&, bmalloc::BulkDecommit&, unsigned long&) + 1548 (Heap.cpp:190)
2   com.apple.JavaScriptCore            0x000000010f9a898d bmalloc::Scavenger::scavenge() + 205 (Scavenger.cpp:205)
3   com.apple.JavaScriptCore            0x000000010f9a970c bmalloc::Scavenger::threadRunLoop() + 284 (Scavenger.cpp:339)
4   com.apple.JavaScriptCore            0x000000010f9a8bd5 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 21
5   com.apple.JavaScriptCore            0x000000010f9ad3f2 decltype(std::__1::forward<void (*)(bmalloc::Scavenger*)>(fp)(std::__1::forward<bmalloc::Scavenger*>(fp0))) std::__1::__invoke<void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*>(void (*&&)(bmalloc::Scavenger*), bmalloc::Scavenger*&&) + 50
6   com.apple.JavaScriptCore            0x000000010f9ad33e void std::__1::__thread_execute<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*, 2ul>(std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*>&, std::__1::__tuple_indices<2ul>) + 62 (thread:342)
7   com.apple.JavaScriptCore            0x000000010f9acbab void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 91 (thread:353)
8   libsystem_pthread.dylib             0x00007fff687f4109 _pthread_start + 148
9   libsystem_pthread.dylib             0x00007fff687efb8b thread_start + 15

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