dart:ffi conflicts with System.loadLibrary on Android API <=23 #59834
Description
Summary
I'm not sure if this is a Dart SDK issue or a Flutter issue.
On Android API versions <=23, calling a function in the Android SDK that does System.loadLibrary, followed by a dart:ffi DynamicLibrary.open fails.
Some examples of the former can be:
android.media.SoundPool, because of the static block hereandroid.webkit.CookieManager.getInstance(), because it loadsWebViewChromiumFactoryProviderwhich loads a library here
More info in a doc in b/159167352
Why this happens
When calling System.loadLibrary on Android <=23, the Java runtime actually overrides the paths searched during a dlopen call (g_ld_library_paths) to match that of the classloader for the caller, before calling dlopen on the library.
When this is called by a function in the Android SDK (i.e. down the call chain of CookieManager), the classloader is different than that of the users application code, and this overrides the g_ld_library_paths to exclude the g_ld_library_paths of the current application / APK.
DynamicLibrary.load(‘libsomething.so’) in Dart is just a thin layer around dlopen. This means that if it is called after the g_ld_library_paths are overridden, the linker will be unable to find the libsomething.so if this was provided from the APK.
Steps to Reproduce
jiahaog/ffi_android_linker_conflict@a8971f4 is a minimal repro
The important files are just
- app/lib/main.dart
- app/android/app/src/main/java/com/example/ffi_android_linker_conflict/MainActivity.java
Expected results:
DynamicLibrary.open succeeds.
Actual results:
Logs
I/flutter ( 5755): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter ( 5755): The following ArgumentError was thrown while handling a gesture:
I/flutter ( 5755): Invalid argument(s): Failed to load dynamic library (dlopen failed: library "libnative_add.so" not
I/flutter ( 5755): found)
I/flutter ( 5755): When the exception was thrown, this was the stack:
I/flutter ( 5755): #0 _open (dart:ffi-patch/ffi_dynamic_library_patch.dart:11:55)
I/flutter ( 5755): #1 new DynamicLibrary.open (dart:ffi-patch/ffi_dynamic_library_patch.dart:20:12)
I/flutter ( 5755): #2 _MyHomePageState._incrementCounter (package:ffi_android_linker_conflict/main.dart:59:26)
I/flutter ( 5755): #3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
I/flutter ( 5755): #4 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
I/flutter ( 5755): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
I/flutter ( 5755): #6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
I/flutter ( 5755): #7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
I/flutter ( 5755): #8 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:256:7)
I/flutter ( 5755): #9 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:158:27)
I/flutter ( 5755): #10 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:224:20)
I/flutter ( 5755): #11 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
I/flutter ( 5755): #12 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
I/flutter ( 5755): #13 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
I/flutter ( 5755): #14 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
I/flutter ( 5755): #18 _invoke1 (dart:ui/hooks.dart:283:10)
I/flutter ( 5755): #19 _dispatchPointerDataPacket (dart:ui/hooks.dart:192:5)
I/flutter ( 5755): (elided 3 frames from dart:async)
I/flutter ( 5755): Handler: "onTap"
I/flutter ( 5755): Recognizer:
I/flutter ( 5755): TapGestureRecognizer#2c717
I/flutter ( 5755): ════════════════════════════════════════════════════════════════════════════════════════════════════
[✓] Flutter (Channel master, 1.20.0-1.0.pre.118, on Mac OS X 10.15.3 19D76, locale en-US)
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