[Webkit-unassigned] [Bug 215221] New: [ macOS iOS wk2 Debug ] editing/undo-manager/undo-manager-delete-stale-undo-items.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215221

            Bug ID: 215221
           Summary: [ macOS iOS wk2 Debug ]
                    editing/undo-manager/undo-manager-delete-stale-undo-it
                    ems.html is a flaky crash
           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: hector_i_lopez at apple.com

editing/undo-manager/undo-manager-delete-stale-undo-items.html

This test is a flaky crash on macOS Debug/gpuprocess and iOS wk2 Debug according to history. First occurrence of a crash on iOS is at r262052. The first occurrence of a crash on macOS is at r259705.

History:
https://results.webkit.org/?suite=layout-tests&test=editing%2Fundo-manager%2Fundo-manager-delete-stale-undo-items.html&limit=50000&platform=ios&platform=mac&style=debug

Crash Log:
https://build.webkit.org/results/Apple%20iPadOS%2013%20Simulator%20Debug%20WK2%20(Tests)/r265322%20(3046)/editing/undo-manager/undo-manager-delete-stale-undo-items-crash-log.txt

Application Specific Information:
CoreSimulator 704.12 - Device: Managed 4 (425092F4-AB17-487D-8C79-D022DCAE0881) - Runtime: iOS 13.4 (17E255) - DeviceType: iPad (5th generation)
CRASHING TEST: editing/undo-manager/undo-manager-delete-stale-undo-items.html

Thread 0:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib              0x00000002468ff882 __psynch_cvwait + 10
1   libsystem_pthread.dylib             0x0000000246961425 _pthread_cond_wait + 698
2   com.apple.JavaScriptCore            0x000000024dc2cd00 WTF::ThreadCondition::wait(WTF::Mutex&) + 48 (ThreadingPOSIX.cpp:518)
3   com.apple.JavaScriptCore            0x000000024dc2cdf5 WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 133 (ThreadingPOSIX.cpp:529)
4   com.apple.JavaScriptCore            0x000000024dbc95fb WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 427 (ParkingLot.cpp:602)
5   com.apple.JavaScriptCore            0x000000024db51900 WTF::ParkingLot::ParkResult WTF::ParkingLot::parkConditionally<bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&)::'lambda'(), bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&)::'lambda0'()>(void const*, WTF::Lock const&, bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&)::'lambda0'() const&, WTF::TimeWithDynamicClockType const&) + 96 (ParkingLot.h:82)
6   com.apple.JavaScriptCore            0x000000024db5180c bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 140 (Condition.h:76)

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