144609 2015-05-04 17:09:49 -0700 GC has trouble with pathologically large array allocations 2015-05-07 19:14:36 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 144691 144749 144750 1 fpizlo fpizlo barraclough benjamin commit-queue ggaren mark.lam mhahnenb mmirman msaboff nrotem oliver ossy saam sam oldest_to_newest 1091617 0 fpizlo 2015-05-04 17:09:49 -0700 Patch forthcoming. 1091618 1 fpizlo 2015-05-04 17:10:13 -0700 Consider the following test, if you tweak the size so that we actually allocate the memory. It causes linear heap growth. function foo(x) { return new Array(x); } noInline(foo); function test(size) { var result = foo(size); if (result.length != size) throw "Error: bad result: " + result; var sawThings = false; for (var s in result) sawThings = true; if (sawThings) throw "Error: array is in bad state: " + result; result[0] = "42.5"; if (result[0] != "42.5") throw "Error: array is in wierd state: " + result; } for (var i = 0; i < 100000; ++i) { test(1000000); } 1091985 2 252432 fpizlo 2015-05-05 18:53:09 -0700 Created attachment 252432 the patch 1092012 3 252432 mark.lam 2015-05-05 19:53:43 -0700 Comment on attachment 252432 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=252432&action=review r=me > Source/JavaScriptCore/tests/stress/new-largeish-contiguous-array-with-size.js:23 > + throw "Error: array is in wierd state: " + result; I believe the correct spelling here is "weird". Can you fix this and the one in new-array-storage-array-with-size.js as well? > Source/JavaScriptCore/tests/stress/new-largeish-contiguous-array-with-size.js:28 > +for (var i = 0; i < 40000; ++i) { > + test(50000); > +} Please add a comment above this to indicate that if GC doesn't clean up adequately, then the heap can grow unreasonably large (in the order of 40000 * 50000 * 8), and would end up much larger than the 100M tested below. While this purpose can be inferred, it is not clear. I think a comment will make it explicit and help the reader see right away what the test is trying to check for. 1092023 4 fpizlo 2015-05-05 20:41:14 -0700 Landed in http://trac.webkit.org/changeset/183847 1092062 5 ossy 2015-05-05 22:59:22 -0700 (In reply to comment #4) > Landed in http://trac.webkit.org/changeset/183847 It caused assertions on the debug bots. Could you check it? 1092063 6 fpizlo 2015-05-05 23:01:14 -0700 (In reply to comment #5) > (In reply to comment #4) > > Landed in http://trac.webkit.org/changeset/183847 > > It caused assertions on the debug bots. Could you check it? See: https://bugs.webkit.org/show_bug.cgi?id=144667 Should be fixed in http://trac.webkit.org/changeset/183851 1092105 7 ossy 2015-05-06 00:45:35 -0700 (In reply to comment #6) > (In reply to comment #5) > > (In reply to comment #4) > > > Landed in http://trac.webkit.org/changeset/183847 > > > > It caused assertions on the debug bots. Could you check it? > > See: https://bugs.webkit.org/show_bug.cgi?id=144667 > > Should be fixed in http://trac.webkit.org/changeset/183851 Yes, it fixed the assertions, thanks. But unfortunately the new test fails on 32 bit ARM Linux bots: stress/new-largeish-contiguous-array-with-size.js.default: Exception: Error: heap too big before forced GC: 129308808 stress/new-largeish-contiguous-array-with-size.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/new-largeish-contiguous-array-with-size.js.default stress/new-largeish-contiguous-array-with-size.js.default: Exception: Error: heap too big before forced GC: 130977916 stress/new-largeish-contiguous-array-with-size.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/new-largeish-contiguous-array-with-size.js.default 1092115 8 ossy 2015-05-06 01:43:38 -0700 And there are still 25-30 layout test assertions. 1092192 9 ap 2015-05-06 09:47:23 -0700 E.g. this one: <https://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fworkers%2Fworker-gc2.html>. Rolling out (Csaba, why didn't you?) 1092194 10 commit-queue 2015-05-06 09:48:23 -0700 Re-opened since this is blocked by bug 144691 1092199 11 ap 2015-05-06 09:52:56 -0700 There are also assorted JSC test failures. Hard to tell if they are all caused by this patch, there was a lot of churn last night. https://build.webkit.org/builders/Apple%20Yosemite%20Debug%20JSC%20%28Tests%29/builds/1241/steps/jscore-test/logs/stdio https://build.webkit.org/builders/Apple%20Win%207%20Debug%20%28Tests%29/builds/66067/steps/jscore-test/logs/stdio 1092504 12 fpizlo 2015-05-06 22:09:18 -0700 Man, this bug is turning out to be brutal. It appears that an old gen block is revived into new space and then deleted. But because we haven't done a full collection yet, our running total of blocks includes that block. Hence the assertion failure. All of this feels very wrong. 1092508 13 fpizlo 2015-05-06 22:19:21 -0700 Aha! We are resizing blocks. This means that our count of the size of old space is wrong, because we will double-count: we will count both the block we deleted and the block we created. 1092568 14 ossy 2015-05-07 04:32:30 -0700 (In reply to comment #9) > Rolling out (Csaba, why didn't you?) I was the bad guy for too long and I was fed up with getting angry comments, so I promised not to roll out others patches even if it broke the whole world. Patch owners are responsible for their patches, they should respect the EWS bubbles, watch the bots after landing. I won't argue with anybody and won't ask anybody to respect the policies. 1092640 15 252599 fpizlo 2015-05-07 10:46:58 -0700 Created attachment 252599 the patch 1092643 16 252599 ggaren 2015-05-07 10:55:44 -0700 Comment on attachment 252599 the patch I'm OK with this solution. But I also think we should just remove that immediate deallocation feature. That's just not how garbage collection works, and making it work that way some small percentage of the time doesn't strike me as valuable. 1092649 17 fpizlo 2015-05-07 11:10:32 -0700 *** Bug 144677 has been marked as a duplicate of this bug. *** 1092652 18 fpizlo 2015-05-07 11:14:55 -0700 (In reply to comment #16) > Comment on attachment 252599 [details] > the patch > > I'm OK with this solution. But I also think we should just remove that > immediate deallocation feature. That's just not how garbage collection > works, and making it work that way some small percentage of the time doesn't > strike me as valuable. I agree. Filed: https://bugs.webkit.org/show_bug.cgi?id=144750 1092990 19 fpizlo 2015-05-07 19:14:36 -0700 Landed in http://trac.webkit.org/changeset/183974 252432 2015-05-05 18:53:09 -0700 2015-05-07 10:46:58 -0700 the patch blah.patch text/plain 7714 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTgzODQzKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI1IEBA CisyMDE1LTA1LTA1ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg R0MgaGFzIHRyb3VibGUgd2l0aCBwYXRob2xvZ2ljYWxseSBsYXJnZSBhcnJheSBhbGxvY2F0aW9u cworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTQ0NjA5 CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgKiBoZWFw L0hlYXAuY3BwOgorICAgICAgICAoSlNDOjpIZWFwOjp1cGRhdGVPYmplY3RDb3VudHMpOiBNYWtl 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