222972 2021-03-09 06:28:05 -0800 [WPE][GTK] TestJSC incorrectly expects garbage collector to collect variables still on the stack 2021-10-06 01:09:15 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build PC Linux RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=181916 https://bugs.webkit.org/show_bug.cgi?id=229321 InRadar P2 Normal --- 181916 1 mcatanzaro webkit-unassigned bugs-noreply cgarcia clopez ews-watchlist keith_miller mark.lam mcatanzaro msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1737543 0 mcatanzaro 2021-03-09 06:28:05 -0800 In bug #181916 we noticed that TestJSC (the testsuite for WPE and GTK ports' JSC API) started failing after switching the GTK port to build with -fvisibility=hidden. Don and I were pretty dumbfounded, but Mark Lam proposed a theory: """ My theory is that the -fvisibility=hidden now makes it such that some functions get inlined, thereby changing the stack values, which in turn potentially keeps a pointer to a dead object on the stack (though the value is not used). With a conservative GC, that keeps the object alive. ... The test is making an assumption that there is no temp on the stack / in a register storing the value of weakFoo try this: 1. move this code into a function and call it: weakFoo = adoptGRef(jsc_weak_value_get_value(weak.get())); checker.watch(weakFoo.get()); g_assert_true(jsc_value_is_object(weakFoo.get())); weakFoo = nullptr; 2. call sanitizeStackForVM() after that before you do the GC. See if that makes the test pass Actually, move all the code that uses weakFoo into the out of line function If this makes the test pass, then it confirms my suspicion that the test is just badly written and made assumptions about the GC that it shouldn’t have Alternatively, you can also do this: 1. Set a breakpoint at 3305 and inspect the value of weakFoo 2. Set a breakpoint at 3310, and check if the value of weakFoo is in any registers or in any stack slots """ After implementing Mark's suggestion, the test began to pass, so it's probably right. However, my current implementation is messy and not suitable to commit. It also touches only the test that was actually failing, /JSC/weak-value. We should probably audit the entire file. 1737544 1 422692 mcatanzaro 2021-03-09 06:28:44 -0800 Created attachment 422692 My test patch from bug #181916 1737640 2 mcatanzaro 2021-03-09 10:12:43 -0800 I'm going to break this test and mark it as flaky in bug #181916. When fixed, we need to update Tools/TestWebKitAPI/glib/TestExpectations.json. 1737739 3 422753 mcatanzaro 2021-03-09 13:32:11 -0800 Created attachment 422753 Yucky test patch that fixes this test 1737740 4 422753 mcatanzaro 2021-03-09 13:34:11 -0800 Comment on attachment 422753 Yucky test patch that fixes this test View in context: https://bugs.webkit.org/attachment.cgi?id=422753&action=review > a/Tools/TestWebKitAPI/Tests/JavaScriptCore/glib/TestJSC.cpp:114 > + JSContextGroupRef jsContextGroup = jscVirtualMachineGetContextGroup(jscVM); BTW this is probably leaked. Not sure how refcounting works with the C API. 1741111 5 422753 cgarcia 2021-03-18 02:41:23 -0700 Comment on attachment 422753 Yucky test patch that fixes this test View in context: https://bugs.webkit.org/attachment.cgi?id=422753&action=review > a/Tools/TestWebKitAPI/Tests/JavaScriptCore/glib/TestJSC.cpp:118 > +static void jscContextSanitizeStack(JSCContext* context) > +{ > + JSCVirtualMachine* jscVM = jsc_context_get_virtual_machine(context); > + JSContextGroupRef jsContextGroup = jscVirtualMachineGetContextGroup(jscVM); > + JSC::VM& vm = *toJS(jsContextGroup); > + JSC::JSLockHolder locker(vm); > + sanitizeStackForVM(vm); > +} I think we could add JSCContextInternal.h with jscContextGarbageCollect() and jscContextSanitizeStack() implemented in JSCContext.cpp. That way we only need to include the internal header from the tests and not use the C API nor internal API from tests 1785697 6 clopez 2021-08-19 22:26:26 -0700 This seems related to bug 229321 1800532 7 cgarcia 2021-10-05 06:31:11 -0700 It seems calling sanitizeStackForVM is enough to make the test pass with hidden symbols, no need to move code to a function. 1800533 8 440206 cgarcia 2021-10-05 06:36:47 -0700 Created attachment 440206 Patch 1800989 9 cgarcia 2021-10-06 01:08:06 -0700 Committed r283606 (242558@main): <https://commits.webkit.org/242558@main> 1800990 10 webkit-bug-importer 2021-10-06 01:09:15 -0700 <rdar://problem/83922969> 422692 2021-03-09 06:28:44 -0800 2021-03-09 13:32:11 -0800 My test patch from bug #181916 test-patch text/plain 10309 mcatanzaro U3VidmVyc2lvbiBSZXZpc2lvbjogMjc0MDg3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZjYwZTBiZmMwYjg1MWVl YzBkNGE3YTgzMGJhZWZiMDRhMzhkMjkwMy4uNThmNjEwNDg1MTFmNjM5MjZjMDY0OTMzMGJjM2Y4 YzZiY2IxY2YxYyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE2IEBACisyMDIxLTAzLTA4ICBNaWNo 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