159648 2016-07-11 15:18:40 -0700 [WK2][iOS] Intermittent crash in [UIApplication beginBackgroundTaskWithName] expiration handler 2016-07-11 16:30:13 -0700 1 1 1 Unclassified WebKit WebKit2 WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 cdumez cdumez achristensen andersca barraclough beidson commit-queue dbates ddkilzer sam webkit-bug-importer oldest_to_newest 1209827 0 cdumez 2016-07-11 15:18:40 -0700 We see an intermittent crash in [UIApplication beginBackgroundTaskWithName] expiration handler. From the traces, we noticed the expiration handler can get called on a non-main thread under certain conditions, which our code is designed to deal with. 1209828 1 cdumez 2016-07-11 15:18:59 -0700 <rdar://problem/27219361> 1209830 2 283352 cdumez 2016-07-11 15:28:25 -0700 Created attachment 283352 Patch 1209838 3 283352 dbates 2016-07-11 15:37:21 -0700 Comment on attachment 283352 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=283352&action=review > Source/WebKit2/UIProcess/ios/ProcessAssertionIOS.mm:101 > + if (RunLoop::current().isMain()) { We can make use of the convenience function RunLoop::isMain() to simplify the if-expression. 1209839 4 283355 cdumez 2016-07-11 15:41:19 -0700 Created attachment 283355 Patch 1209840 5 andersca 2016-07-11 15:47:04 -0700 Wouldn't it be better to just always dispatch to the main thread? This will break if the UIKit semantics change. 1209851 6 283359 cdumez 2016-07-11 16:03:13 -0700 Created attachment 283359 Patch 1209872 7 283359 commit-queue 2016-07-11 16:30:07 -0700 Comment on attachment 283359 Patch Clearing flags on attachment: 283359 Committed r203094: <http://trac.webkit.org/changeset/203094> 1209873 8 commit-queue 2016-07-11 16:30:13 -0700 All reviewed patches have been landed. Closing bug. 283352 2016-07-11 15:28:25 -0700 2016-07-11 15:41:16 -0700 Patch bug-159648-20160711152743.patch text/plain 3576 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjAzMDgwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0Mi9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViS2l0Mi9DaGFuZ2VMb2cKaW5kZXggM2E5YTMzZGE1YTA2OGUy MzM4NDdhNTExMTU5OWQ4MThkZGYxYWYzYy4uOTQyMjJjYjJmYzVhZTA2MWZmZGI4ODQ5NTY4NDE2 MzNlMDlmYzRmMCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYktpdDIvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJLaXQyL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI0IEBACisyMDE2LTA3LTExICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgW1dLMl1baU9TXSBJbnRlcm1p dHRlbnQgY3Jhc2ggaW4gW1VJQXBwbGljYXRpb24gYmVnaW5CYWNrZ3JvdW5kVGFza1dpdGhOYW1l XSBleHBpcmF0aW9uIGhhbmRsZXIKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hv d19idWcuY2dpP2lkPTE1OTY0OAorICAgICAgICA8cmRhcjovL3Byb2JsZW0vMjcyMTkzNjE+CisK KyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgV2Ugc2VlIGFu IGludGVybWl0dGVudCBjcmFzaCBpbiBbVUlBcHBsaWNhdGlvbiBiZWdpbkJhY2tncm91bmRUYXNr 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15:41:19 -0700 2016-07-11 16:03:09 -0700 Patch bug-159648-20160711154037.patch text/plain 3580 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjAzMDgwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0Mi9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViS2l0Mi9DaGFuZ2VMb2cKaW5kZXggM2E5YTMzZGE1YTA2OGUy MzM4NDdhNTExMTU5OWQ4MThkZGYxYWYzYy4uOTQyMjJjYjJmYzVhZTA2MWZmZGI4ODQ5NTY4NDE2 MzNlMDlmYzRmMCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYktpdDIvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJLaXQyL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI0IEBACisyMDE2LTA3LTExICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgW1dLMl1baU9TXSBJbnRlcm1p dHRlbnQgY3Jhc2ggaW4gW1VJQXBwbGljYXRpb24gYmVnaW5CYWNrZ3JvdW5kVGFza1dpdGhOYW1l XSBleHBpcmF0aW9uIGhhbmRsZXIKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hv d19idWcuY2dpP2lkPTE1OTY0OAorICAgICAgICA8cmRhcjovL3Byb2JsZW0vMjcyMTkzNjE+CisK KyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgV2Ugc2VlIGFu IGludGVybWl0dGVudCBjcmFzaCBpbiBbVUlBcHBsaWNhdGlvbiBiZWdpbkJhY2tncm91bmRUYXNr 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