225676 2021-05-11 15:54:03 -0700 ConservativeRoots triggers page demand on Speedometer 2021-05-12 14:06:45 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 225705 1 ggaren ggaren commit-queue ews-watchlist fpizlo keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1759083 0 ggaren 2021-05-11 15:54:03 -0700 ConservativeRoots triggers page demand on Speedometer 1759084 1 428319 ggaren 2021-05-11 15:57:57 -0700 Created attachment 428319 Patch 1759108 2 428319 ggaren 2021-05-11 17:21:45 -0700 Comment on attachment 428319 Patch cq+ 1759113 3 ews-feeder 2021-05-11 17:52:18 -0700 Committed r277346 (237604@main): <https://commits.webkit.org/237604@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428319. 1759114 4 webkit-bug-importer 2021-05-11 17:53:16 -0700 <rdar://problem/77872621> 1759258 5 428319 fpizlo 2021-05-12 08:40:18 -0700 Comment on attachment 428319 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428319&action=review > Source/JavaScriptCore/heap/ConservativeRoots.cpp:61 > + m_roots.append(bitwise_cast<HeapCell*>(p)); Doesn't this code while some threads are thread_suspended? In that case, I think you just introduced one of my favorite deadlocks: - The append() calls malloc, which tries to grab some lock. - Meanwhile some other thread is thread_suspended while holding that lock. Nothing says that thread_suspend can't stop a thread while it's inside fastMalloc, system malloc, or anything else that holds locks. I think that's why this code previously used a super janky want of allocating memory -- it was that way so that it didn't have to take locks to allocate. 1759321 6 commit-queue 2021-05-12 11:32:35 -0700 Re-opened since this is blocked by bug 225705 1759363 7 428405 ggaren 2021-05-12 12:56:16 -0700 Created attachment 428405 Patch 1759372 8 428405 ggaren 2021-05-12 13:14:31 -0700 Comment on attachment 428405 Patch cq+ 1759398 9 ews-feeder 2021-05-12 14:06:43 -0700 Committed r277388 (237644@main): <https://commits.webkit.org/237644@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428405. 428319 2021-05-11 15:57:57 -0700 2021-05-12 12:56:14 -0700 Patch bug-225676-20210511155756.patch text/plain 5779 ggaren SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjc3MzQxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI5IEBA CisyMDIxLTA1LTExICBHZW9mZnJleSBHYXJlbiAgPGdnYXJlbkBhcHBsZS5jb20+CisKKyAgICAg ICAgQ29uc2VydmF0aXZlUm9vdHMgdHJpZ2dlcnMgcGFnZSBkZW1hbmQgb24gU3BlZWRvbWV0ZXIK KyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIyNTY3Ngor CisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFVzZSBhIFZl Y3RvciBpbnN0ZWFkIG9mIE9TQWxsb2NhdG9yIHRvIGF2b2lkIG1tYXAoKSBhbmQgcGFnZSBmYXVs dCAtLQorICAgICAgICBhbmQsIGxpa2UsIGNvbWUgb24uCisKKyAgICAgICAgQnVtcCBkZWZhdWx0 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