ANR Android createAndRunEngine

[rahul4slice]

Steps to reproduce

In Application onCreate, We are doing createAndRunEngine on FlutterEngineGroup.
Happening on App-Launch

Expected results

ANR should not be experience by user

Actual results

ANR is Experienced by lots of users(thousands) as per firebase and play-console.

Code sample

flutterEngine = flutterEngineGroup?.createAndRunEngine(options)

Screenshots or Video

No response

Logs

Logs

  #00  pc 0x000000000004d56c  /apex/com.android.runtime/lib64/bionic/libc.so (syscall+28)
  #01  pc 0x0000000000051ff0  /apex/com.android.runtime/lib64/bionic/libc.so (__futex_wait_ex+144)
  #02  pc 0x00000000000b3b80  /apex/com.android.runtime/lib64/bionic/libc.so (pthread_cond_wait+80)
  #03  pc 0x000000000097bd50  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #04  pc 0x000000000072dc74  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #05  pc 0x00000000007f218c  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #06  pc 0x00000000007f2b3c  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #07  pc 0x0000000000806190  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #08  pc 0x0000000000805fa8  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  #09  pc 0x0000000000496284  /data/app/~~H6ZHTV_37dQ_1VFi7-Q73A==/indwin.c3.shareapp-HfFVgQ_obyEjMdWONOmKug==/lib/arm64/libflutter.so (BuildId: 3031bbbe81d7b590351f632cfe5b0209afd516bd)
  at io.flutter.embedding.engine.FlutterJNI.nativeRunBundleAndSnapshotFromLibrary (FlutterJNI.java)
  at io.flutter.embedding.engine.FlutterJNI.runBundleAndSnapshotFromLibrary (FlutterJNI.java:1001)
  at io.flutter.embedding.engine.dart.DartExecutor.executeDartEntrypoint (DartExecutor.java:146)
  at io.flutter.embedding.engine.FlutterEngineGroup.createAndRunEngine (FlutterEngineGroup.java:166)
  at com.xyz.android.platform.xyz.flutter.FlutterManager.setCoreFlutterEngine (FlutterManager.kt:106)
  at com.xyz.android.platform.xyz.flutter.FlutterManager.setDartEntrypointConfig (FlutterManager.kt:97)
  at com.xyz.android.platform.xyz.flutter.FlutterManager.initFlutterEngine (FlutterManager.kt:56)

Flutter Doctor output

Android Target SDK -35
Flutter SDK - 3.29.1

[tirth-patel-nc]

@rahul4slice your report is extremely vague. To investigate properly, please provide the following:

• a minimal, reproducible, and runnable sample without third-party packages or complex production code that consistently triggers the crash
• whether the issue occurs on the latest stable (3.32.8) and master channels
• a fully symbolized stacktrace
• device models and platforms where the issue occurs

Without this information, the report is not actionable. thank you!

[jason-simmons]

Symbolized the libflutter.so frames in the stack trace:

flutter/third_party/libcxx/include/__threading_support:335
flutter/third_party/txt/src/txt/platform_android.cc:23
flutter/third_party/txt/src/txt/font_collection.cc:48
flutter/third_party/libcxx/include/__functional/function.h:1187
flutter/shell/common/shell.cc:666
flutter/shell/common/shell.cc:655
flutter/shell/platform/android/android_shell_holder.cc:297

This is blocked on a condition variable when the newly created engine calls FontCollection::SetupDefaultFontManager and Skia's SkFontMgr_New_Android. Not sure why this would happen.

[tirth-patel-nc]

thanks Jason!

Keeping this open for the team’s tracking. @rahul4slice, please add any necessary details you have, along with the ones requested #173087 (comment).