223096 2021-03-11 15:43:33 -0800 [GPU Process] Encoding buffer for DisplayList items should be aligned to 8 bytes 2021-03-11 21:57:25 -0800 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 222835 1 sabouhallawa sabouhallawa dino ggaren simon.fraser thorton webkit-bug-importer wenson_hsieh oldest_to_newest 1738669 0 sabouhallawa 2021-03-11 15:43:33 -0800 ItemBuffer::append() allocates a static buffer whose size = sizeof(DisplayList::Item) + uint64_t for the DisplayList::ItemType. But this static buffer is of type uint8_t. So this array should be aligned to the alignment of a single uint8_t which is 1. The expectation is to have this buffer aligned to 8 bytes so all each member in the encoded DisplayList::Item can be aligned to its alignment requirement. This was caught on Apple Silicon when trying to enable GPU rendering for 2D canvas for layout tests. See https://build.webkit.org/#/builders/103/builds/88. But the same assertion fires if the same page is just opened in mini browser while GPU rendering for 2D canvas is enabled. 1738674 1 422983 sabouhallawa 2021-03-11 15:49:31 -0800 Created attachment 422983 Patch 1738688 2 422983 ggaren 2021-03-11 16:01:41 -0800 Comment on attachment 422983 Patch I think modern C++ has a nicer explicit feature to just say the alignment you want. alignas, maybe? 1738695 3 422987 sabouhallawa 2021-03-11 16:14:17 -0800 Created attachment 422987 Patch 1738723 4 422998 sabouhallawa 2021-03-11 17:14:19 -0800 Created attachment 422998 Patch 1738729 5 423002 sabouhallawa 2021-03-11 17:55:22 -0800 Created attachment 423002 Patch 1738735 6 423004 sabouhallawa 2021-03-11 18:57:35 -0800 Created attachment 423004 Patch 1738748 7 ews-feeder 2021-03-11 20:19:05 -0800 commit-queue failed to commit attachment 423004 to WebKit repository. To retry, please set cq+ flag again. 1738762 8 423012 sabouhallawa 2021-03-11 20:59:22 -0800 Created attachment 423012 Patch 1738776 9 ews-feeder 2021-03-11 21:56:59 -0800 Committed r274326: <https://commits.webkit.org/r274326> All reviewed patches have been landed. Closing bug and clearing flags on attachment 423012. 1738777 10 webkit-bug-importer 2021-03-11 21:57:25 -0800 <rdar://problem/75348461> 422983 2021-03-11 15:49:31 -0800 2021-03-11 16:14:15 -0800 Patch bug-223096-20210311154930.patch text/plain 2035 sabouhallawa U3VidmVyc2lvbiBSZXZpc2lvbjogMjc0MjMxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNzQ5NjUzODU2NGZjMDIz NTUyOGVlNDFjNDk2MWEyYWZkOWI4ZDlhOC4uYjlmZmIwNDEwMDYyMjMyNmVjMTY5MWI2ZjRiYzQ0 ZjhlMDUzMjQxMiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE3IEBACisyMDIxLTAzLTExICBTYWlk IEFib3UtSGFsbGF3YSAgPHNhaWRAYXBwbGUuY29tPgorCisgICAgICAgIFtHUFUgUHJvY2Vzc10g RW5jb2RpbmcgYnVmZmVyIGZvciBEaXNwbGF5TGlzdCBpdGVtcyBzaG91bGQgYmUgYWxpZ25lZCB0 byA4IGJ5dGVzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p ZD0yMjMwOTYKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAg 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