187843 2018-07-19 19:29:14 -0700 -[WKContentView(WKInteraction) _restoreFocusWithToken:] crashed 2018-08-26 20:33:59 -0700 1 1 1 Unclassified WebKit WebKit2 Other iPhone / iPad iOS 11 RESOLVED INVALID InRadar P2 Normal --- 1 894110476 webkit-unassigned 329750074 894110476 megan_gardner mitz thorton webkit-bug-importer wenson_hsieh oldest_to_newest 1443656 0 894110476 2018-07-19 19:29:14 -0700 we found a crash on wkwebview above iOS11.3. It maybe happened when the UIViewController is animating. Hope fix it or get a workaround. 1443657 1 345420 894110476 2018-07-19 19:33:33 -0700 Created attachment 345420 Call stacks when crash happened. 1443993 2 ap 2018-07-20 19:24:02 -0700 *** Bug 187842 has been marked as a duplicate of this bug. *** 1443994 3 ap 2018-07-20 19:26:30 -0700 This is unlikely to be actionable without more information. Please provide steps to reproduce, or at least attach a complete crash log. What application is affected, and how frequently does this happen? 1443998 4 webkit-bug-importer 2018-07-20 19:29:19 -0700 <rdar://problem/42454640> 1444206 5 894110476 2018-07-22 19:19:20 -0700 Thank you for your attention.we did not reproduce it offline, but a fews happened online. so there is no complete crash log which can be exported from iOS device locally. I will attach a log from our reporter. The application affected is JDApp from JD.com, the proportion is about 5% in total crashes. (In reply to Alexey Proskuryakov from comment #3) > This is unlikely to be actionable without more information. Please provide > steps to reproduce, or at least attach a complete crash log. > > What application is affected, and how frequently does this happen? 1444207 6 345554 894110476 2018-07-22 19:23:00 -0700 Created attachment 345554 crash log including all threads 1445640 7 wenson_hsieh 2018-07-26 21:00:11 -0700 Thanks for the information! From a quick glance, what could be happening is that we're getting an extra call to -_restoreFocusWithToken: when we don't expect to. The API (SPI?) contract for focus restoration is that each call to -_preserveFocusWithToken: should be bookended with exactly one call to -_restoreFocusWithToken:, so any mismatch here would cause us to crash in the UI process when we try and remove from _focusStateStack in this if statement: if (_focusStateStack.takeLast()) It probably makes sense to fail gracefully by bailing early if the focus state stack is empty here instead of merely debug asserting like we do now. That being said, the root cause is most likely beneath WebKit, in logic that's responsible for telling us to preserve or restore focus. Regarding your comment in the other bug (181510): > if we remove a webview when it is not on the top of navigationcontroller's viewcontrollers. when back to the 'webviewpage(had removed)', a crash will happen low frequently Do you happen to have a test app that exercises this scenario? That would be very helpful in confirming a fix! 1447495 8 329750074 2018-08-02 19:37:26 -0700 The RootViewController (push)-> a webviewController(present)->The A (a native viewcontroller)(push)-> a webviewcontroller(push)->a native viewcontroller(push)->a webviewcontroller,then the A dismiss,at the time,the app crash 1447592 9 894110476 2018-08-03 06:26:54 -0700 Thanks a lot. Unfortunately! It is our Official app instead of test app! we found two scenes the problem occurs. The first one is when UINaivgationController pop to the webviewController which had been removed as mentioned above (we do not remove the webviewController in our newer app, and the crash rate Significantly reduced).The other is when a presented ViewController who had push some webviewcontrollers is dismissing,then app crashed, the detail navigation stack just as Hank said. It should be noted that all conclusion is summarized from our monitor. not reproducing the problem. (In reply to Wenson Hsieh from comment #7) > Thanks for the information! From a quick glance, what could be happening is > that we're getting an extra call to -_restoreFocusWithToken: when we don't > expect to. The API (SPI?) contract for focus restoration is that each call > to -_preserveFocusWithToken: should be bookended with exactly one call to > -_restoreFocusWithToken:, so any mismatch here would cause us to crash in > the UI process when we try and remove from _focusStateStack in this if > statement: > > if (_focusStateStack.takeLast()) > > It probably makes sense to fail gracefully by bailing early if the focus > state stack is empty here instead of merely debug asserting like we do now. > That being said, the root cause is most likely beneath WebKit, in logic > that's responsible for telling us to preserve or restore focus. > > Regarding your comment in the other bug (181510): > > > if we remove a webview when it is not on the top of navigationcontroller's viewcontrollers. when back to the 'webviewpage(had removed)', a crash will happen low frequently > > Do you happen to have a test app that exercises this scenario? That would be > very helpful in confirming a fix! 1453779 10 894110476 2018-08-26 20:33:12 -0700 Dear Wenson Hsieh: We are sorry about that this is not a problem about webkit, we found a memory leak which is used to mananger navigationBar to webview controller. The problem was fixed after the memory leak was resolved. Thank you very much. (In reply to Wenson Hsieh from comment #7) > Thanks for the information! From a quick glance, what could be happening is > that we're getting an extra call to -_restoreFocusWithToken: when we don't > expect to. The API (SPI?) contract for focus restoration is that each call > to -_preserveFocusWithToken: should be bookended with exactly one call to > -_restoreFocusWithToken:, so any mismatch here would cause us to crash in > the UI process when we try and remove from _focusStateStack in this if > statement: > > if (_focusStateStack.takeLast()) > > It probably makes sense to fail gracefully by bailing early if the focus > state stack is empty here instead of merely debug asserting like we do now. > That being said, the root cause is most likely beneath WebKit, in logic > that's responsible for telling us to preserve or restore focus. > > Regarding your comment in the other bug (181510): > > > if we remove a webview when it is not on the top of navigationcontroller's viewcontrollers. when back to the 'webviewpage(had removed)', a crash will happen low frequently > > Do you happen to have a test app that exercises this scenario? That would be > very helpful in confirming a fix! 345420 2018-07-19 19:33:33 -0700 2018-07-19 19:33:33 -0700 Call stacks when crash happened. file_187843.txt text/plain 1816 894110476 VGhyZWFkIDAoY3Jhc2hlZCkNCjAJV2ViS2l0CS1bV0tDb250ZW50VmlldyhXS0ludGVyYWN0aW9u KSBfcmVzdG9yZUZvY3VzV2l0aFRva2VuOl0gKGluIFdlYktpdCkgKyA4MA0KMQlVSUtpdAktW1VJ UGVyaXBoZXJhbEhvc3QoVUlLaXRJbnRlcm5hbCkgX3Jlc3RvcmVNdWx0aURvY3VtZW50VG9rZW5J Zk5lY2Vzc2FyeTp3aXRoSWQ6XSAoaW4gVUlLaXQpICsgMTY0DQoyCVVJS2l0CS1bVUlQZXJpcGhl cmFsSG9zdChVSUtpdEludGVybmFsKSBfcmVzdG9yZUlucHV0Vmlld3NXaXRoSWQ6YW5pbWF0ZWQ6 XSAoaW4gVUlLaXQpICsgNTkyDQozCVVJS2l0CS1bVUlOYXZpZ2F0aW9uQ29udHJvbGxlciBuYXZp Z2F0aW9uVHJhbnNpdGlvblZpZXc6ZGlkU3RhcnRUcmFuc2l0aW9uOl0gKGluIFVJS2l0KSArIDEx MDgNCjQJVUlLaXQJLVtVSU5hdmlnYXRpb25UcmFuc2l0aW9uVmlldyB0cmFuc2l0aW9uOmZyb21W aWV3OnRvVmlldzpdIChpbiBVSUtpdCkgKyA3ODgNCjUJVUlLaXQJLVtVSU5hdmlnYXRpb25Db250 cm9sbGVyIF9zdGFydFRyYW5zaXRpb246ZnJvbVZpZXdDb250cm9sbGVyOnRvVmlld0NvbnRyb2xs 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