[Webkit-unassigned] [Bug 247302] New: Crash trying to scroll a main frame PDF with UI-side compositing on macOS.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247302

            Bug ID: 247302
           Summary: Crash trying to scroll a main frame PDF with UI-side
                    compositing on macOS.
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Process Model
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

EventDispatcher has a null ScrollingTree:

Thread 16 Crashed::  Dispatch queue: com.apple.WebKit.EventDispatcher
0   WebCore                                    0x71bff0bd9 bool std::__1::__cxx_atomic_compare_exchange_weak<unsigned char>(std::__1::__cxx_atomic_base_impl<unsigned char>*, unsigned char*, unsigned char, std::__1::memory_order, std::__1::memory_order) + 2 (atomic:1050) [inlined]
1   WebCore                                    0x71bff0bd9 std::__1::__atomic_base<unsigned char, false>::compare_exchange_weak(unsigned char&, unsigned char, std::__1::memory_order) + 2 (atomic:1681) [inlined]
2   WebCore                                    0x71bff0bd9 WTF::Atomic<unsigned char>::compareExchangeWeak(unsigned char, unsigned char, std::__1::memory_order) + 2 (Atomics.h:89) [inlined]
3   WebCore                                    0x71bff0bd9 WTF::LockAlgorithm<unsigned char, (unsigned char)1, (unsigned char)2, WTF::EmptyLockHooks<unsigned char> >::lockFastAssumingZero(WTF::Atomic<unsigned char>&) + 2 (LockAlgorithm.h:53) [inlined]
4   WebCore                                    0x71bff0bd9 WTF::Lock::lock() + 2 (Lock.h:65) [inlined]
5   WebCore                                    0x71bff0bd9 WTF::Locker<WTF::Lock>::Locker(WTF::Lock&) + 2 (Lock.h:158) [inlined]
6   WebCore                                    0x71bff0bd9 WTF::Locker<WTF::Lock>::Locker(WTF::Lock&) + 2 (Lock.h:157) [inlined]
7   WebCore                                    0x71bff0bd9 WebCore::ScrollingTree::hasProcessedWheelEventsRecently() + 25 (ScrollingTree.cpp:784)
8   WebCore                                    0x71bffad05 WebCore::ThreadedScrollingTree::scrollingThreadIsActive() + 5 (ThreadedScrollingTree.cpp:354) [inlined]
9   WebCore                                    0x71bffad05 WebCore::ThreadedScrollingTree::displayDidRefresh(unsigned int) + 21 (ThreadedScrollingTree.cpp:532)
10  WebKit                                     0x71330b04b WebKit::EventDispatcher::notifyScrollingTreesDisplayWasRefreshed(unsigned int) + 181 (EventDispatcher.cpp:306)
11  WebKit                                     0x71330b0eb WebKit::EventDispatcher::displayWasRefreshed(unsigned int, WebCore::DisplayUpdate const&, bool) + 67 (EventDispatcher.cpp:321)

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