Bug 148026 – Frequent assertions on animations/restart-after-scroll.html

• Component: Layout and Rendering
• Status: NEW

[Alexey Proskuryakov]

animations/restart-after-scroll.html very frequently asserts in debug builds, both WK1 and WK2:

    if (m_absCaretBoundsDirty && m_selection.isCaret()) // We should be able to always assert this condition.
        ASSERT(m_absCaretBounds == m_selection.visibleStart().absoluteCaretBounds());

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore      	0x000000011088c2f7 WTFCrash + 39
1   com.apple.WebCore             	0x0000000112a029ce WebCore::FrameSelection::recomputeCaretRect() + 878 (FrameSelection.cpp:1484)
2   com.apple.WebCore             	0x0000000112a02e0b WebCore::FrameSelection::invalidateCaretRect() + 91 (FrameSelection.cpp:1518)
3   com.apple.WebCore             	0x00000001129f9b4b WebCore::FrameSelection::caretBlinkTimerFired() + 235 (FrameSelection.cpp:1987)
4   com.apple.WebCore             	0x0000000112a079c8 void std::__1::__invoke_void_return_wrapper<void>::__call<std::__1::__bind<void (WebCore::FrameSelection::*&)(), WebCore::FrameSelection*>&>(std::__1::__bind<void (WebCore::FrameSelection::*&)(), WebCore::FrameSelection*>&&&) + 248 (__functional_base:441)
5   com.apple.WebCore             	0x0000000112a0789c std::__1::__function::__func<std::__1::__bind<void (WebCore::FrameSelection::*&)(), WebCore::FrameSelection*>, std::__1::allocator<std::__1::__bind<void (WebCore::FrameSelection::*&)(), WebCore::FrameSelection*> >, void ()>::operator()() + 44 (functional:1407)
6   com.apple.WebCore             	0x00000001120c463a std::__1::function<void ()>::operator()() const + 26 (functional:1793)
7   com.apple.WebCore             	0x00000001120c455c WebCore::Timer::fired() + 28 (Timer.h:134)
8   com.apple.WebCore             	0x000000011410713a WebCore::ThreadTimers::sharedTimerFiredInternal() + 394 (ThreadTimers.cpp:135)
9   com.apple.WebCore             	0x0000000114106df9 WebCore::ThreadTimers::sharedTimerFired() + 25 (ThreadTimers.cpp:108)
10  com.apple.WebCore             	0x0000000113db5802 WebCore::timerFired(__CFRunLoopTimer*, void*) + 34 (SharedTimerCF.cpp:82)

rdar://problem/21843062

[Alexey Proskuryakov]

Got 9 crashes when running the test like this, so the assertion is readily reproducible:

run-webkit-tests LayoutTests/animations/restart-after-scroll.html  --repeat 100 -f

Skipped the test in r188476

[Simon Fraser (smfr)]

This was an iOS platform test that I moved.