195388 2019-03-06 16:57:54 -0800 [macOS] Fixed elements can flicker on a page that is busy doing layout 2019-03-08 08:47:16 -0800 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 simon.fraser webkit-unassigned koivisto simon.fraser zalan oldest_to_newest 1513297 0 363817 simon.fraser 2019-03-06 16:57:54 -0800 Created attachment 363817 Testcase Fixed bars can flicker to incorrect positions on a page that is busy doing layout. 1513302 1 simon.fraser 2019-03-06 17:00:33 -0800 Seen on macOS, reproduces in shipping Safari. I think what's happening is that the main thread can be busy running JS etc, allowing a commit on the main thread with a very stale position for the fixed layer. Meanwhile, the scrolling thread has moved ahead, and is continually pushing the layer to its correct position. The fix is to allow the scrolling tree to have the final say on layer positions, so post-flush, traverse the scrolling tree on the main thread and have it set positions based on the scrolling thread's scroll position. 1513933 2 simon.fraser 2019-03-07 23:21:34 -0800 Still not sure what's happening here. I have verified that the state of the layer tree as set by the scrolling thread is always correct (logging CALayer positions). We may have a race between main thread commits setting layer positions, and the scrolling tree doing so. We don't really have any protection against CACommit racing. 1514010 3 simon.fraser 2019-03-08 08:47:02 -0800 Does not reproduce with UI-side compositing and some applyScrollingTreeLayerPositions() work, so does seem to be caused by CACommit racing. I saw in traces that CACommits in main thread and scrolling thread are overlapping. 363817 2019-03-06 16:57:54 -0800 2019-03-06 16:57:54 -0800 Testcase top-fixed-layouting-bar.html text/html 19041 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgICA8bWV0YSBuYW1lPSJ2aWV3cG9ydCIg Y29udGVudD0iaW5pdGlhbC1zY2FsZT0xIj4KICAgIDx0aXRsZT5Ub3AgRml4ZWQgQmFyIExheW91 dGluZzwvdGl0bGU+CiAgICA8c3R5bGUgdHlwZT0idGV4dC9jc3MiIG1lZGlhPSJzY3JlZW4iPgog ICAgICBib2R5IHsKICAgICAgICBoZWlnaHQ6IDIwMDBweDsKICAgICAgfQogICAgICAKICAgICAg LmZpeGVkIHsKICAgICAgICBwb3NpdGlvbjogZml4ZWQ7CiAgICAgICAgd2lkdGg6IDEwMCU7CiAg ICAgICAgdG9wOiAwOwogICAgICAgIGxlZnQ6IDA7CiAgICAgICAgaGVpZ2h0OiA1MHB4OwogICAg ICAgIGJhY2tncm91bmQtY29sb3I6IHJnYmEoMCwgMTI4LCAwLCAwLjgpOwogICAgICAgIGJvcmRl cjogMnB4IHNvbGlkIGJsYWNrOwogICAgICAgIGJveC1zaXppbmc6IGJvcmRlci1ib3g7CiAgICAg ICAgdHJhbnNmb3JtLW9yaWdpbjogdG9wIGxlZnQ7CiAgICAgICAgdHJhbnNmb3JtOiB0cmFuc2xh dGUoMCwgMCk7CiAgICAgIH0KICAgICAgCiAgICAgIHAgewogICAgICAgIG1hcmdpbjogMjBweCAx 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