211595 2020-05-07 14:19:17 -0700 Code pattern in GC tests in LayoutTests is broken 2020-05-08 12:58:40 -0700 1 1 1 Unclassified WebKit DOM WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki eric.carlson ews-watchlist glenn hta jer.noble keith_miller philipj saam sergio tommyw webkit-bug-importer oldest_to_newest 1650348 0 ysuzuki 2020-05-07 14:19:17 -0700 A lot of GC tests in LayoutTests are broken, they are not assuming that JavaScriptCore is using conservative GC. 1650351 1 webkit-bug-importer 2020-05-07 14:26:28 -0700 <rdar://problem/62993121> 1650354 2 ysuzuki 2020-05-07 14:33:46 -0700 These tests are doing, 1. Allocate one object 2. Invoking GC repeatedly until we observe that (1)'s object is collected This is not the right approach. If we allocate only one object without using loop, it is very possible that this one object's address exists in some of CPU register in some case, and it is kept alive. The right approach is, 1. Allocating many objects with loop. This ensures that stack / register can only include some of them. Not all of them. If the objects are allocated in a loop, then it is super possible that next iteration can overwrite the same register / stack location with new object, and old object is not in the conservative root (that's why we recommend using loop for GC test). 2. Invoking GC repeatedly, and check one of (1) is at least collected. 1650357 3 ysuzuki 2020-05-07 14:42:45 -0700 For example, LayoutTests/resize-observer/element-leak.html is great. 1650437 4 398820 ysuzuki 2020-05-07 17:58:36 -0700 Created attachment 398820 Patch 1650444 5 398820 saam 2020-05-07 18:24:16 -0700 Comment on attachment 398820 Patch r=me 1650447 6 398820 keith_miller 2020-05-07 18:30:20 -0700 Comment on attachment 398820 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=398820&action=review r=me with some comments. > LayoutTests/ChangeLog:19 > + This is not being a problem in practice. Web pages are executing various kind of code and they clobber conservative roots. However, tests in Typo: This is not being a => This is not a > LayoutTests/ChangeLog:30 > + 3. Repeatedly invoke GC and test whether *one of (1) iframes* gets collected at least. Theoretically this is still possible that completely > + unrelated integer value in conservative roots can point to the reference of (1). By allocating many iframes in (1) and testing one of them, > + we can reduce the possibility of this conflict. I have a minor quip with this approach. I think you should only have to invoke GC once. If the first GC fails I doubt any subsequent ones will do any better. Ideally, it would also be an async GC so as much of the stack can be cleared as possible. Maybe we should provide such an API to WebCore? It could be as simple as `setTimeout(syncGC, 0)` > LayoutTests/http/tests/resources/gc.js:53 > + await waitFor(50); Why do we need the await? isn't gc() sync? 1650454 7 398820 ysuzuki 2020-05-07 18:47:48 -0700 Comment on attachment 398820 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=398820&action=review >> LayoutTests/ChangeLog:19 >> + This is not being a problem in practice. Web pages are executing various kind of code and they clobber conservative roots. However, tests in > > Typo: This is not being a => This is not a Fixed. >> LayoutTests/ChangeLog:30 >> + we can reduce the possibility of this conflict. > > I have a minor quip with this approach. I think you should only have to invoke GC once. If the first GC fails I doubt any subsequent ones will do any better. Ideally, it would also be an async GC so as much of the stack can be cleared as possible. Maybe we should provide such an API to WebCore? It could be as simple as `setTimeout(syncGC, 0)` I think it would be possible that multiple GC cycles can be effective. For example, 1. An object has Strong<> or something in its field while it is correctly handled to make non-cyclic leak 2. First GC makes this object dead 3. The destructor of (2) will destroy Strong<> 4. Then, the second GC makes held object of Strong<> dead >> LayoutTests/http/tests/resources/gc.js:53 >> + await waitFor(50); > > Why do we need the await? isn't gc() sync? Three reasons, 1. This `gc()` is async 2. Want to continue the next iteration in the new macro-task (setTimeout) to ensure that RunLoop is iterated (and stack is once cleared) 3. Because the original code was using this :) 1650665 8 ysuzuki 2020-05-08 10:14:24 -0700 Committed r261391: <https://trac.webkit.org/changeset/261391> 1650725 9 ysuzuki 2020-05-08 12:58:40 -0700 Note that I picked 20 iframe count which comes from resize-observer/element-leak.html. And I've ensured that this is enough at least for Release builds in my local environment. But not sure how it is in Debug builds (it will generate code which uses CPU registers / stack in a different manner). At least, in EWS, they are not failing. But if we still see the flakiness, we will increase it a bit. But I believe 20 is enough. 398820 2020-05-07 17:58:36 -0700 2020-05-07 18:24:16 -0700 Patch bug-211595-20200507175836.patch text/plain 29758 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjYxMzA1CmRpZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9DaGFu Z2VMb2cgYi9MYXlvdXRUZXN0cy9DaGFuZ2VMb2cKaW5kZXggZWY3NmI1NjFmNWZkZjkwNjk0Nzhj ODZjNDk2NGY2Y2VjZTE1Y2FlZi4uMzRiNDI3ZGZmMWIzN2QwOGY4NjNhYzc0YzRlYTVhMGNlYzU1 MWFkYiAxMDA2NDQKLS0tIGEvTGF5b3V0VGVzdHMvQ2hhbmdlTG9nCisrKyBiL0xheW91dFRlc3Rz L0NoYW5nZUxvZwpAQCAtMSwzICsxLDUyIEBACisyMDIwLTA1LTA3ICBZdXN1a2UgU3V6dWtpICA8 eXN1enVraUBhcHBsZS5jb20+CisKKyAgICAgICAgQ29kZSBwYXR0ZXJuIGluIEdDIHRlc3RzIGlu IExheW91dFRlc3RzIGlzIGJyb2tlbgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9z aG93X2J1Zy5jZ2k/aWQ9MjExNTk1CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BT ISkuCisKKyAgICAgICAgTGF5b3V0VGVzdHMgaGF2ZSBzZXZlcmFsIHRlc3RzIHdoaWNoIGF0dGVt cHQgdG8gZW5zdXJlIHRoYXQgZG9jdW1lbnQgaXMgbm90IGxlYWtlZC4gQnV0IHRoZXkgYXJlIGJy b2tlbiBzaW5jZSB0aGVzZSB0ZXN0cyBhcmUgbm90IGNvcnJlY3RseQorICAgICAgICBoYW5kbGlu 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