[Webkit-unassigned] [Bug 186206] [GTK] WebKit::CoordinatedBackingStoreTile::setBackBuffer(): WebKitWebProcess killed by SIGSEGV (ASSERTION FAILED: it != m_tiles.end())

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186206

--- Comment #17 from Fujii Hironori <Hironori.Fujii at sony.com> ---
CoordinatedGraphicsLayer::shouldHaveBackingStore() and
CoordinatedGraphicsScene's layerShouldHaveBackingStore() must
always match.

But, mismatch happens because an opacity animation is stopped in
CoordinatedGraphicsScene side. Then,
CoordinatedGraphicsScene::prepareContentBackingStore calls
CoordinatedGraphicsScene::removeBackingStoreIfNeeded to remove
all CoordinatedBackingStoreTile because
layerShouldHaveBackingStore() returns false.

Then, CoordinatedBackingStoreTile can't be found in CoordinatedBackingStore.

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