Out of opt, debug tests on 5 different Pixel devices I saw this crash once for opt. Not sure if this is on other devices/versions. Full run: https://treeherder.allizom.org/#/jobs?repo=mozilla-central&filter-searchStr=autophone&tochange=28eb27fd7d141a8f9f2a6dbfae892ad78ecb40a5&fromchange=05328d3102efd4d5fc0696489734d7771d24459f&selectedJob=5481375 https://treeherder.allizom.org/logviewer.html#?job_id=5481375&repo=mozilla-central#L693 Thread 41 (crashed) 0 libxul.so!mozilla::java::GeckoLayerClient::SyncFrameMetrics [Accessors.h:05328d3102ef : 59 + 0x2] r0 = 0x00000001 r1 = 0x63f43ec2 r2 = 0xd5ac2d59 r3 = 0x00000000 r4 = 0xc9f7f190 r5 = 0xc9f7f198 r6 = 0xe91855b0 r7 = 0xd61d4a6c r8 = 0x00000000 r9 = 0x00000000 r10 = 0xc8e5e000 r12 = 0xeefaae88 fp = 0xc9d553e0 sp = 0xc9f7f0c0 lr = 0xf0276609 pc = 0xd4d7c286 Found by: given as instruction pointer in context 1 libxul.so!mozilla::widget::AndroidCompositorWidget::SyncFrameMetrics [AndroidCompositorWidget.cpp:05328d3102ef : 52 + 0x1b] r4 = 0xc9f7f198 r5 = 0xc9f7f240 r6 = 0xc9f7f188 r7 = 0xc9f7f468 r8 = 0xc9f7f3e8 r9 = 0xc9f7f428 r10 = 0xc8e5e000 fp = 0xc9d553e0 sp = 0xc9f7f150 pc = 0xd4d8847d Found by: call frame info 2 libxul.so!mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree(mozilla::layers::Layer*, bool*)::{lambda(mozilla::layers::Layer*)#2}::operator()(mozilla::layers::Layer*) const + 0x3e8 r4 = 0xd1051000 r5 = 0xc5923be8 r6 = 0xc2dac920 r7 = 0xc9f7f59c r8 = 0xc9f7f240 r9 = 0xc9f7f4a8 r10 = 0xc8e5e000 fp = 0xc9d553e0 sp = 0xc9f7f1e8 pc = 0xd45d9eb3 Found by: call frame info 3 libxul.so!mozilla::layers::ForEachNode<mozilla::layers::ForwardIterator, mozilla::layers::Layer*, mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree(mozilla::layers::Layer*, bool*)::<lambda(mozilla::layers::Layer*)>, mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree(mozilla::layers::Layer*, bool*)::<lambda(mozilla::layers::Layer*)> > [TreeTraversal.h:05328d3102ef : 145 + 0x7] r4 = 0x00000000 r5 = 0xd1051000 r6 = 0xc9f7f59c r7 = 0xc9f7f58c r8 = 0xc9f7f520 r9 = 0xca4fd1d0 r10 = 0xc9d553e0 fp = 0xc9f7f618 sp = 0xc9f7f520 pc = 0xd45da2b7 Found by: call frame info 4 libxul.so!mozilla::layers::ForEachNode<mozilla::layers::ForwardIterator, mozilla::layers::Layer*, mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree(mozilla::layers::Layer*, bool*)::<lambda(mozilla::layers::Layer*)>, mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree(mozilla::layers::Layer*, bool*)::<lambda(mozilla::layers::Layer*)> > [TreeTraversal.h:05328d3102ef : 142 + 0x9] r4 = 0xd1051000 r5 = 0xc8d35800 r6 = 0xc9f7f59c r7 = 0xc9f7f58c r8 = 0xc9f7f550 r9 = 0xca4fd1d0 r10 = 0xc9d553e0 fp = 0xc9f7f618 sp = 0xc9f7f550 pc = 0xd45da2a5 Found by: call frame info 5 libxul.so!mozilla::layers::AsyncCompositionManager::ApplyAsyncContentTransformToTree [AsyncCompositionManager.cpp:05328d3102ef : 1132 + 0x11] r4 = 0x00000000 r5 = 0xc9f7f590 r6 = 0xc8d35800 r7 = 0xc9f7f658 r8 = 0x00000000 r9 = 0xca4fd1d0 r10 = 0xc9d553e0 fp = 0xc9f7f618 sp = 0xc9f7f580 pc = 0xd45da301 Found by: call frame info

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