ANR (Application Not Responding) - Main Thread Blocking During Talsec Initialization

[Hritik602]

⚠️ Important: This issue cannot be reliably reproduced manually during development/testing. It appears sporadically in production and is reported via Google Play Console's ANR statistics.

Description

Based on the stacktrace analysis, it appears that the Talsec.start() method may be performing synchronous file I/O operations on the calling thread. While I cannot confirm with absolute certainty, the evidence strongly suggests this could be causing ANR (Application Not Responding) issues when called from the main/UI thread in production environments.

Stacktrace

"main" tid=1 Native
  #00  pc 0x000000000005775c  /apex/com.android.runtime/lib64/bionic/libc.so (syscall+28)
  #01  pc 0x0000000000201230  /apex/com.android.art/lib64/libart.so (art::ConditionVariable::WaitHoldingLocks+136)
  #02  pc 0x0000000000671ddc  /apex/com.android.art/lib64/libart.so (art::JNI<false>::ReleaseByteArrayElements+1936)
  #03  pc 0x000000000002ce94  /apex/com.android.art/lib64/libjavacore.so (Linux_readBytes+348)
  at libcore.io.Linux.readBytes (Native method)
  at libcore.io.Linux.read (Linux.java:229)
  at libcore.io.ForwardingOs.read (ForwardingOs.java:618)
  at libcore.io.BlockGuardOs.read (BlockGuardOs.java:325)
  at libcore.io.ForwardingOs.read (ForwardingOs.java:618)
  at libcore.io.IoBridge.read (IoBridge.java:604)
  at java.io.FileInputStream.read (FileInputStream.java:353)
  at java.io.BufferedInputStream.read1 (BufferedInputStream.java:277)
  at java.io.BufferedInputStream.read (BufferedInputStream.java:338)
  at sun.nio.cs.StreamDecoder.readBytes (StreamDecoder.java:291)
  at sun.nio.cs.StreamDecoder.implRead (StreamDecoder.java:355)
  at sun.nio.cs.StreamDecoder.read (StreamDecoder.java:181)
  at java.io.Reader.read (Reader.java:189)
  at java.io.InputStreamReader.read (InputStreamReader.java:157)
  at java.util.Scanner.readInput (Scanner.java:892)
  at java.util.Scanner.next (Scanner.java:1495)
  at com.aheaditec.talsec.security.s1.a (SourceFile:1)
  at com.aheaditec.talsec.security.s1.c (SourceFile:1)
  at com.aheaditec.talsec.security.g0.a (SourceFile:23)
  at com.aheaditec.talsec.security.g0.f (SourceFile:1)
  at com.aheaditec.talsec.security.g0.<init> (SourceFile:4)
  at com.aheaditec.talsec.security.n1.<init> (SourceFile:1)
  at com.aheaditec.talsec.security.m1.<init> (SourceFile:7)
  at com.aheaditec.talsec.security.m1.a (SourceFile:3)
  at com.aheaditec.talsec_security.security.api.Talsec.start (unavailable:41)
  at com.aheaditec.freerasp.handlers.TalsecThreatHandler.start$freerasp_release (TalsecThreatHandler.kt:28)
  at com.aheaditec.freerasp.handlers.MethodCallHandler.start (MethodCallHandler.kt:140)
  at com.aheaditec.freerasp.handlers.MethodCallHandler.onMethodCall (MethodCallHandler.kt:119)
  at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage (MethodChannel.java:267)
  at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler (DartMessenger.java:292)
  at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger (DartMessenger.java:319)
  at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run (D8$$SyntheticClass)
  at android.os.Handler.handleCallback (Handler.java:996)
  at android.os.Handler.dispatchMessage (Handler.java:110)
  at android.os.Looper.loopOnce (Looper.java:210)
  at android.os.Looper.loop (Looper.java:302)
  at android.app.ActivityThread.main (ActivityThread.java:9675)
  at java.lang.reflect.Method.invoke (Native method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:601)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1062)

flutter doctor --verbose
[✓] Flutter (Channel stable, 3.35.0, on macOS 15.6 24G84 darwin-arm64, locale en-NP) [327ms]
    • Flutter version 3.35.0 on channel stable at /Users/hritikkarn/Development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b896255557 (8 weeks ago), 2025-08-13 17:14:08 -0700
    • Engine revision 1e9a811bf8
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0-rc3) [1,278ms]
    • Android SDK at /Users/hritikkarn/Library/Android/sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 36.0.0-rc3
    • ANDROID_HOME = /Users/hritikkarn/Library/Android/sdk
    • Java binary at: /opt/homebrew/opt/openjdk@17/bin/java
      This JDK is specified in your Flutter configuration.
      To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment Homebrew (build 17.0.15+0)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2) [889ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16C5032a
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [7ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2025.1) [7ms]
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /Applications/Android Studio.app
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)

[✓] Connected device (1 available) [6.5s]
    • M2101K7BG (mobile) • EURGKF6XU8RSKBK7 • android-arm64  • Android 13 (API 33)

[✓] Network resources [466ms]
    • All expected network resources are available.

• No issues found!

freerasp: ^7.2.1

[Hritik602]

@yardexx