213526 2020-06-23 12:29:30 -0700 REGRESSION (r263328): Crash in bool WTF::WeakHashSet<WebKit::AudioSessionRoutingArbitratorProxy, WTF::EmptyCounter>::contains<WebKit::AudioSessionRoutingArbitratorProxy> const 2020-06-24 08:24:51 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jer.noble jer.noble eric.carlson ews-watchlist glenn peng.liu6 philipj sergio slewis webkit-bug-importer oldest_to_newest 1665497 0 jer.noble 2020-06-23 12:29:30 -0700 REGRESSION (r263328): Crash in bool WTF::WeakHashSet<WebKit::AudioSessionRoutingArbitratorProxy, WTF::EmptyCounter>::contains<WebKit::AudioSessionRoutingArbitratorProxy> const 1665499 1 jer.noble 2020-06-23 12:30:04 -0700 <rdar://problem/64591777> 1665500 2 402582 jer.noble 2020-06-23 12:31:57 -0700 Created attachment 402582 Patch 1665531 3 402588 jer.noble 2020-06-23 13:53:42 -0700 Created attachment 402588 Patch 1665562 4 jer.noble 2020-06-23 15:20:49 -0700 No crashes when running tests locally. 1665651 5 jer.noble 2020-06-23 23:17:09 -0700 Whelp, I updated sources, re-built, and re-ran tests and crashes aplenty. The crash log shows an assertion in the UniqueRef operator->() called from WebProcessProxy::shutDown(). So the underlying cause /must/ be that WebProcessProxy was dealloc'd (and it's UniqueRef member's destructor called) sometime before shutDown(). 1665652 6 jer.noble 2020-06-23 23:19:46 -0700 Oh! I bet WebProcessPool::disconnectProcess(WebProcessProxy*) has the side-effect of destroying the WebProcessProxy! And the next line is the UniqueRef operator->() which is showing a crash result. That means the underlying problem has nothing to do with the ASSERT in the patch above, but instead that any call after disconnectProcess(this) is a potential unsafe access of freed memory. 1665653 7 402624 jer.noble 2020-06-23 23:34:39 -0700 Created attachment 402624 Patch 1665655 8 jer.noble 2020-06-23 23:55:26 -0700 The above fix definitely eliminated all the crashes seen previously when running run-webkit-tests against a release build. 1665742 9 ews-feeder 2020-06-24 08:24:50 -0700 Committed r263456: <https://trac.webkit.org/changeset/263456> All reviewed patches have been landed. Closing bug and clearing flags on attachment 402624. 402582 2020-06-23 12:31:57 -0700 2020-06-23 13:53:41 -0700 Patch bug-213526-20200623123156.patch text/plain 2829 jer.noble U3VidmVyc2lvbiBSZXZpc2lvbjogMjYzMjI4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IGRjNTUwNTU2MDk2NTMzODJh OTc2ZWNhNjQ2NDdmYzFiMGJjMmI1YTYuLmEwNzAwNzZmNjZlZWY5ZGM1MTE5Y2UzZGU0NmY3OGRh ZjQxOTJjMmMgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTcgQEAKKzIwMjAtMDYtMjMgIEplciBOb2Js ZSAgPGplci5ub2JsZUBhcHBsZS5jb20+CisKKyAgICAgICAgUkVHUkVTU0lPTiAocjI2MzMyOCk6 IENyYXNoIGluIGJvb2wgV1RGOjpXZWFrSGFzaFNldDxXZWJLaXQ6OkF1ZGlvU2Vzc2lvblJvdXRp bmdBcmJpdHJhdG9yUHJveHksIFdURjo6RW1wdHlDb3VudGVyPjo6Y29udGFpbnM8V2ViS2l0OjpB dWRpb1Nlc3Npb25Sb3V0aW5nQXJiaXRyYXRvclByb3h5PiBjb25zdAorICAgICAgICBodHRwczov L2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjEzNTI2CisgICAgICAgIDxyZGFyOi8v 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