java.lang.UnsatisfiedLinkError: dlopen failed: library "libpthread.so.0" not found

[yehorchankov]

I am trying to run the project and got stuck with the exception. The project builds successfully and tries to run on my android device, but I have the following error:

2020-02-07 15:36:02.087 23982-23982/com.tencent.squeezencnn E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.tencent.squeezencnn, PID: 23982
    java.lang.UnsatisfiedLinkError: dlopen failed: library "libpthread.so.0" not found
        at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
        at java.lang.System.loadLibrary(System.java:1669)
        at com.tencent.squeezencnn.SqueezeNcnn.<clinit>(SqueezeNcnn.java:27)
        at com.tencent.squeezencnn.MainActivity.<init>(MainActivity.java:39)
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1216)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2864)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:201)
        at android.app.ActivityThread.main(ActivityThread.java:6806)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

Previously I had similar exception, but with libomp.so file. I could solve it by creating app/src/jniLibs/arm64-v8a directory and placing libomp.so file from internet in the directory. When I try to do the same, but with libpthread.so.0 file, I have an error.

My working environment:
Android 9 device
Android Studio 3.5.3
Ubuntu 19.04
Ndk 21.0.6113669

[jiayisong]

@yehorchankov NDK version too high

[yehorchankov]

@jiayisong did downgrading the NDK fix the issue? To which version of NDK should I roll back?

[laoxihongshi]

@jiayisong did downgrading the NDK fix the issue? To which version of NDK should I roll back?

r19c can fix this issue.

[jiayisong]

@jiayisong did downgrading the NDK fix the issue? To which version of NDK should I roll back?

Yes，I solved this problem with 19.2.5345600.

[nihui]

The project should work properly with ndk-r21d now