gouteru opened a new issue, #1232: URL: https://github.com/apache/cordova-ios/issues/1232
# Bug Report Many of my app users has been reporting the issue that my app stops as white screen when it back to foreground from background. # Problem ## What is expected to happen? When back to foreground, app should display its webview contents properly. ## What does actually happen? When back to foreground, app displays white blank screen and no way to control by user(it looks freezing). # Information I have been researching the issue a couple of months because I haven't reproduced. Finally I could reproduce the issue by killing 2 webview processes with Acitivity Monitor of MacOS. ### Here’s the procedure. 1. Start app with XCode Simulator(ex: iPhone12 mini). 2. By using Simulator, get app switch to background. 3. Kill 2 processes(com.apple.Webkit.networking, com.apple.Webkit.WebContent) of app by using Activity Monitor. Clicking “Forced termination“. 4. Back the app to foreground. 5. The app shows white screen and no way to control. When the app is back to foreground, app shows white screen but the killed 2 processes are reloaded in Activity Monitor view. But those 2 processes seem never communicate with app main process properly. I guess, cordova-ios detects that webview processes are terminated and do webview.reload() but after that the reloaded processes are not communicating with app main process. Then my Javascript code is not loaded, not working, not rendering anything, so I can do nothing. ### Here’s the log of Xcode. ``` 2022-04-19 21:56:05.574242+0900 Miley PTA[1372:4054372] app entered background 2022-04-19 21:56:05.574344+0900 Miley PTA[1372:4054372] Set state background 2022-04-19 21:56:05.574434+0900 Miley PTA[1372:4054372] Disconnected from FCM 2022-04-19 21:56:05.590935+0900 Miley PTA[1372:4054372] [Snapshotting] Snapshotting a view (0x7fd97b078a00, UIKeyboardImpl) that has not been rendered at least once requires afterScreenUpdates:YES. 2022-04-19 21:56:05.893567+0900 Miley PTA[1372:4054372] pause! 2022-04-19 21:58:28.746089+0900 Miley PTA[1372:4054372] [Process] 0x111aca330 - NetworkProcessProxy::didClose (Network Process 0 crash) 2022-04-19 21:58:28.746328+0900 Miley PTA[1372:4054372] [Process] 0x111af1600 - [PID=1511] WebProcessProxy::didClose: (web process 0 crash) 2022-04-19 21:58:28.746420+0900 Miley PTA[1372:4054372] [Process] 0x111af1600 - [PID=1511] WebProcessProxy::processDidTerminateOrFailedToLaunch: reason=4 2022-04-19 21:58:28.747083+0900 Miley PTA[1372:4054372] [ProcessSuspension] 0x111abd420 - ProcessAssertion: Failed to acquire RBS Background assertion 'ConnectionTerminationWatchdog' for process because PID is invalid 2022-04-19 21:58:28.747464+0900 Miley PTA[1372:4063884] [ProcessSuspension] 0x111abd420 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=0, error: (null) 2022-04-19 21:58:28.747907+0900 Miley PTA[1372:4054372] [Process] 0x7fd97b033420 - [pageProxyID=11, webPageID=12, PID=1511] WebPageProxy::processDidTerminate: (pid 1511), reason 4 2022-04-19 21:58:28.750921+0900 Miley PTA[1372:4054372] [Loading] 0x7fd97b033420 - [pageProxyID=11, webPageID=12, PID=1511] WebPageProxy::dispatchProcessDidTerminate: reason=4 2022-04-19 21:58:28.763300+0900 Miley PTA[1372:4054372] CDVWebViewEngine shouldReloadWebView:: 2022-04-19 21:58:28.763576+0900 Miley PTA[1372:4054372] CDVWebViewEngine shouldReloadWebView title: 2022-04-19 21:58:28.763874+0900 Miley PTA[1372:4054372] CDVWebViewEngine shouldReloadWebView location: app://localhost/index.html#/AppView 2022-04-19 21:58:28.764176+0900 Miley PTA[1372:4054372] CDVWebViewEngine shouldReloadWebView reload: 0 2022-04-19 21:58:29.053010+0900 Miley PTA[1372:4054372] app become active 2022-04-19 21:58:29.053151+0900 Miley PTA[1372:4054372] Set state foreground 2022-04-19 21:58:29.145401+0900 Miley PTA[1372:4054372] IAB.close() called but it was already closed. 2022-04-19 21:58:29.584398+0900 Miley PTA[1372:4054372] Cordova view ready 2022-04-19 21:58:29.589231+0900 Miley PTA[1372:4054372] BuildInfo init: 0.0000 sec(40616 nsec): Cache data return 2022-04-19 21:58:29.590158+0900 Miley PTA[1372:4054372] start Js Event Bridge 2022-04-19 21:58:29.603274+0900 Miley PTA[1372:4054372] FCM: has been created 2022-04-19 21:58:29.603535+0900 Miley PTA[1372:4054372] FCM: Ready! 2022-04-19 21:58:30.373260+0900 Miley PTA[1372:4065189] [boringssl] boringssl_metrics_log_metric_block_invoke(151) Failed to log metrics 2022-04-19 21:58:58.749429+0900 Miley PTA[1372:4054372] Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service 2022-04-19 22:27:59.054707+0900 Miley PTA[1372:4077801] [default] LaunchServices: disconnect event interruption received for service com.apple.lsd.mapdb 2022-04-19 22:28:54.071186+0900 Miley PTA[1372:4080043] [XPC] Handle connection with error: Connection interrupted ``` ## Environment, Platform, Device Various of iPhone hardware and iOS versions has been reported from my app users. ## Version information - Installed platforms: android 10.1.1, ios 6.2.0 - cordova-plugin-android-dark-mode-support 1.0.0 "AndroidDarkModeSupport" - cordova-plugin-androidx-adapter 1.1.3 "cordova-plugin-androidx-adapter" - cordova-plugin-badge 0.8.8 "Badge" - cordova-plugin-buildinfo 4.0.0 "BuildInfo" - cordova-plugin-calendar 5.1.6 "Calendar" - cordova-plugin-customurlscheme 5.0.0 "Custom URL scheme" - cordova-plugin-fcm-with-dependecy-updated 7.8.0 "Cordova FCM Push Plugin" - cordova-plugin-file 6.0.2 "File" - cordova-plugin-inappbrowser 5.0.0 "InAppBrowser" - cordova-plugin-splashscreen 6.0.0 "Splashscreen" - cordova-plugin-statusbar 3.0.0 "StatusBar" - cordova-plugin-webviewcolor 2.2.0 "WebView background color plugin" - cordova-plugin-wkwebview-file-xhr 3.0.0 "Cordova WKWebView File XHR Plugin" - Vue 2.6.14 - Firebase 9.6.1 # Checklist [x] I searched for existing GitHub issues [x] I updated all Cordova tooling to most recent version [x] I included all the necessary information above -- This is an automated message from the Apache Git Service. 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