184502 2018-04-11 08:27:12 -0700 Safari 11.1: MessageChannel no longer works between Workers 2018-08-30 03:54:44 -0700 1 1 1 Unclassified WebKit WebKit Misc. Safari 11 Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=184254 https://bugs.webkit.org/show_bug.cgi?id=184769 InRadar P2 Critical --- 1 ashley tzagallo ap beidson cdumez commit-queue dbates esprehn+autocc ews-watchlist ggaren hy kangil.han ryanhaddad tzagallo webkit-bug-importer youennf oldest_to_newest 1413683 0 ashley 2018-04-11 08:27:12 -0700 This is a critical issue that causes our PWA Construct 3 (editor.construct.net) to no longer work in Safari 11.1 on either iOS 11.3 or macOS 10.13.4. Repro URL: https://www.scirra.com/labs/bugs/safarimessagechannel/ Steps to reproduce: open page, open JavaScript console, and look at log messages Expected result: last log message should read: "[Worker2] Received forwarded message: Hello world" Observed result: last log message reads: "[Worker1] Received message to forward, posting to Worker 2: Hello world" This URL creates two Web Workers, creates a MessageChannel, and transfers port1 and port2 to the first and second web workers. This is a typical way to allow Web Workers to directly communicate without going through the main document, and is a workaround to the fact nested workers aren't widely supported. For example now if Worker 1 posts data to its message port, it will be received by port2 in Worker 2. In Safari 11.1, a message posted down the MessageChannel is never received at the other end. This causes this setup to fail, since no messages are received by the other worker. In our PWA, this causes the UI to permanently hang, since we use this arrangement to dispatch several kinds of processing jobs to web workers. It works correctly in Chrome 65, Firefox 59 and Edge 16. The log message "[Worker2] Received forwarded message: Hello world" indicates that Worker 2 received a message sent down the MessageChannel from Worker 1. This log message is missing in Safari 11.1. The final log message ("[Worker1] Received message to forward, posting to Worker 2: Hello world") indicates the message was posted, but it is never received. 1413686 1 ashley 2018-04-11 08:29:17 -0700 I'd add it appeared to work in Safari 11.0 so this appears to be a regression. 1413945 2 webkit-bug-importer 2018-04-11 23:24:31 -0700 <rdar://problem/39372771> 1414030 3 cdumez 2018-04-12 09:01:00 -0700 Potential dupe of Bug 184254? 1414275 4 tzagallo 2018-04-12 19:25:46 -0700 (In reply to Chris Dumez from comment #3) > Potential dupe of Bug 184254? I reduced the test case and I don't believe it's a dupe. This issue only appears when sending messages from workers to workers, and is not affected by the kind of data being sent. I will investigate more. 1414474 5 337908 tzagallo 2018-04-13 10:59:06 -0700 Created attachment 337908 Patch 1414477 6 tzagallo 2018-04-13 11:05:03 -0700 The issue was that when transferring a MessagePort, we only retained the MessagePortChannel for the duration of the transfer if it was being sent via another MessagePort. When sending both ports via workers, there was no reference to the MessagePortChannel left, so it got deallocated. By the time the message was received, the reference from the port back to the channel had been cleared, so the message was dropped. I added a minimal test case, and also checked the example provided, both work. I'm not sure if entangling/disentangling is the best place to retain the channel though, but it seemed like the most central place, where it would require the least changes. 1414565 7 337938 tzagallo 2018-04-13 18:24:14 -0700 Created attachment 337938 Patch 1415322 8 337938 ggaren 2018-04-17 16:12:16 -0700 Comment on attachment 337938 Patch r=me 1415334 9 337938 commit-queue 2018-04-17 16:38:51 -0700 Comment on attachment 337938 Patch Clearing flags on attachment: 337938 Committed r230738: <https://trac.webkit.org/changeset/230738> 1415335 10 commit-queue 2018-04-17 16:38:52 -0700 All reviewed patches have been landed. Closing bug. 1415776 11 ryanhaddad 2018-04-18 16:39:38 -0700 The LayoutTest added with this change is a flaky failure due to messages being received/printed out of order: --- /Volumes/Data/slave/sierra-release-tests-wk1/build/layout-test-results/workers/worker-to-worker-expected.txt +++ /Volumes/Data/slave/sierra-release-tests-wk1/build/layout-test-results/workers/worker-to-worker-actual.txt @@ -6,6 +6,6 @@ PASS successfullyParsed is true TEST COMPLETE +[Worker 2] Received message: hello [Worker 1] Received message: hello -[Worker 2] Received message: hello https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=workers%2Fworker-to-worker.html 1415959 12 337938 ggaren 2018-04-19 10:05:23 -0700 Comment on attachment 337938 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=337938&action=review > LayoutTests/workers/worker-to-worker.html:23 > + worker("Worker 1", mc.port1, 1), Looks like the problem here is that 1ms is not a deterministic or reliable guarantee of ordering. If you change the worker function to pass e.data to its resolver, then you can process log the e.data results in deterministic order at the very end, after all promises have resolved. 1415969 13 ap 2018-04-19 10:18:23 -0700 Tadeu has a fix in bug 184769. 1455188 14 hy 2018-08-30 02:52:04 -0700 The Status says "Resolved Fixed" but i'm still facing the same issue with current versions (macOS 10.13.6/Safari 11.1.2 & iOS 11.4). Posting messages from worker to worker using messagechannel ports won't work at all. You can still use Ashley's Repro URL to reproduce this in the mentioned versions. 1455194 15 ashley 2018-08-30 03:36:05 -0700 Apple are typically opaque about process and slow to get fixes to release. However as far as I can tell by myself, it should be fixed in the latest Safari Technology Preview, and in Safari 12 when that's released. Yes, this feature has been broken for the entire time Safari 11.1 has been out. They did the same thing when they broke WebAssembly... 1455196 16 hy 2018-08-30 03:54:44 -0700 Thanks for the info Ashley! I tested it with Safari Tech Preview now and can confirm that it's working.. Unfortunately i will need to build a workaround if this fix only ships with 12 since we found out that most of our macOS/IOs users don't update their devices/systems frequently. 337908 2018-04-13 10:59:06 -0700 2018-04-13 18:24:13 -0700 Patch bug-184502-20180413105905.patch text/plain 7631 tzagallo U3VidmVyc2lvbiBSZXZpc2lvbjogMjMwNDg2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMTAzNGNlMzRjMGQxYzkx OWUzMjA3OWM4NThiOWRhMGJiNGFmYjU3OC4uMGY0ZDc1ZTE2ZGRiNzljNjU3NzdjOThkZmIzNzA3 YTYxZjc5ODEyMSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIyIEBACisyMDE4LTA0LTEzICBUYWRl dSBaYWdhbGxvICA8dGFkZXV6YWdhbGxvQGdtYWlsLmNvbT4KKworICAgICAgICBSZXRhaW4gTWVz c2FnZVBvcnRDaGFubmVsIGZvciB0cmFuc2ZlciB3aGVuIGRpc2VudGFuZ2xpbmcgcG9ydHMKKyAg ICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE4NDUwMgorICAg ICAgICA8cmRhcjovL3Byb2JsZW0vMzkzNzI3NzE+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9C 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