[Process] kill() returned unexpected error 1 - iOS

System info

Issue occurs on: iOS
Plugin version: 0.3.8 & 0.3.10+1
Device used : iPad Air 2
Device iOS Version : 13.3.1

Flutter doctor output:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.14.5 18F132, locale fr-BE)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
[✓] Android Studio (version 3.2)
[✓] IntelliJ IDEA Ultimate Edition (version 2019.1.2)
[✓] Connected device (1 available)

• No issues found!

Steps to Reproduce

1. We edit the user agent to adapt the behavior of the website and we launch the webview
2. The line [Process] kill() returned unexpected error 1 appears all the time and seems to reload the webview all the time, which kill the user agent and break the behavior and interceptions for the app.

Logs

Here are the logs for a 2 minutes utilisation (some lines have been cut to avoid to be to long to read since it's the same line ...

2020-02-13 11:23:21.267815+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.280795+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.280914+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.283047+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.409267+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.446632+0100 MyApp [414:17909] [] tcp_input [C2.1:3] flags=[R] seq=1006332445, ack=0, win=0 state=CLOSED rcv_nxt=1006332445, snd_una=1523391102
2020-02-13 11:23:21.446854+0100 MyApp [414:17909] [] tcp_input [C2.1:3] flags=[R] seq=1006332445, ack=0, win=0 state=CLOSED rcv_nxt=1006332445, snd_una=1523391102
2020-02-13 11:23:21.450507+0100 MyApp [414:17908] 6.16.0 - [Firebase/Analytics][I-ACS023141] 
2020-02-13 11:23:21.477095+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.477223+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.492547+0100 MyApp [414:17906] [] tcp_input [C3.1:3] flags=[R] seq=3826942167, ack=0, win=0 state=CLOSED rcv_nxt=3826942167, snd_una=3459830947
2020-02-13 11:23:21.492746+0100 MyApp [414:17906] [] tcp_input [C3.1:3] flags=[R] seq=3826942167, ack=0, win=0 state=CLOSED rcv_nxt=3826942167, snd_una=3459830947
2020-02-13 11:23:21.501743+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.513696+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.518754+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.580803+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.581048+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.582360+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.617912+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.656890+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.657226+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.680600+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.711224+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.718833+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.785660+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.785954+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.810774+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:23:21.830742+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
… (Cut to reduce the length of lines) …
2020-02-13 11:25:55.184043+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:55.193870+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:55.685170+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:55.693938+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:56.186840+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:56.193856+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:56.688260+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:56.694009+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.193048+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.210668+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.666482+0100 MyApp [414:17686] VERBOSE: oneSignalApplicationWillResignActive
2020-02-13 11:25:57.667286+0100 MyApp [414:17686] VERBOSE: Application Backgrounded started
2020-02-13 11:25:57.671649+0100 MyApp [414:17686] VERBOSE: TimeProcessor <OSUnattributedFocusTimeProcessor: 0x2827fa620> for session attributed 0
2020-02-13 11:25:57.672312+0100 MyApp [414:17686] VERBOSE: sendOnFocusCall unattributed with totalTimeActive 216.483555
2020-02-13 11:25:57.672668+0100 MyApp [414:17686] VERBOSE: OSBaseFocusTimeProcessor hasMinSyncTime getMinSessionTime: 60 activeTime: 216.483555
2020-02-13 11:25:57.690065+0100 MyApp [414:18111] VERBOSE: beginBackgroundFocusTask start
2020-02-13 11:25:57.730550+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.731345+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.732619+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.743742+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:57.866528+0100 MyApp [414:17686] VERBOSE: sendOnFocusCallWithParams unattributed succeed, saveUnsentActiveTime with 0
2020-02-13 11:25:57.866660+0100 MyApp [414:17686] VERBOSE: OSUnattributedFocusTimeProcessor:endDelayBackgroundTask:12
2020-02-13 11:25:57.866939+0100 MyApp [414:17686] VERBOSE: endBackgroundFocusTask called
2020-02-13 11:25:58.192434+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:58.194243+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:58.693412+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:58.710581+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.196071+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.210716+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.328310+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.332942+0100 MyApp [414:17686] VERBOSE: oneSignalApplicationDidEnterBackground
2020-02-13 11:25:59.516527+0100 MyApp [414:17686] Can't end BackgroundTask: no background task exists with identifier 15 (0xf), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.
2020-02-13 11:25:59.516918+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.517251+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.518402+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.518723+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:25:59.522753+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:26:02.690795+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1
2020-02-13 11:26:02.691814+0100 MyApp [414:17686] [Process] kill() returned unexpected error 1

#Flutter doctor -v output :

[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.14.5 18F132, locale fr-BE)
    • Flutter version 1.12.13+hotfix.8 at /Users/dev/Desktop/Projects/flutter/flutter
    • Framework revision 0b8abb4724 (2 days ago), 2020-02-11 11:44:36 -0800
    • Engine revision e1e6ced81d
    • Dart version 2.7.0

 
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/dev/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.2.1, Build version 11B500
    • CocoaPods version 1.7.5

[✓] Android Studio (version 3.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 31.3.1
    • Dart plugin version 181.5656
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)

[✓] IntelliJ IDEA Ultimate Edition (version 2019.1.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 35.3.3
    • Dart plugin version 191.7141.49

[✓] Connected device (1 available)
    • macdev’s iPad • 9d09a24ab86a38d0bd60a8fadd345d34510855c6 • ios • iOS 13.3.1

• No issues found!

Thanks by advance !

Commencez par reproduire le problème sur l’iPad Air 2 signalé avec iOS 13.3.1, Flutter 1.12.13+hotfix.8 et les versions du plugin 0.3.8 ou 0.3.10+1 lors de la modification du user agent. Suivez les messages [Process] kill() répétés en parallèle du rechargement de la WebView et de l’échec de l’interception. Le travail est terminé lorsque l’erreur de processus ne provoque plus de rechargements répétés et ne casse plus le comportement du user agent ni les interceptions.