QNetwork error when use Qt lib with native JNI Android application

[alexpi]

I have the simple Qt lib that makes http request like this:

QNetworkAccessManager networkAccessManager;
QNetworkRequest request{QUrl("http://www.google.ru")};
QNetworkReply * reply = networkAccessManager.get(request);
...

All works fine when i run it on Android devices (armeabi-v7a and x86) diractly from Qt Creator. But i want to use it inside android native application with NDK and JNI. In this case it works only on armeabi-v7a devices and with Android from version 6.0. If i run android application with this lib on x86 device it crash with next message:

Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 11830 (itekllc.testjni)

And it occurs on this line of code inside my Qt lib:

QNetworkReply * reply = networkAccessManager.get(request);

This is my communication.cpp file in native android project:

#include <jni.h>
#include "QCoreApplication"
#include "testandroidthreadslib.h"

#ifndef _Included_com_navitekllc_testjni_CppWrapper
#define _Included_com_navitekllc_testjni_CppWrapper

#ifdef __cplusplus
extern "C" {
#endif

JNIEXPORT void JNICALL
Java_com_navitekllc_testjni_CppWrapper_testNetwork(JNIEnv *env, jclass type) {
    TestAndroidThreadsLib testLib;
    testLib.run();
}

#ifdef __cplusplus
}
#endif
#endif

This is my .java file to call .cpp function:

public class CppWrapper {
    public static native void testNetwork();

    static {
        System.loadLibrary("communication");
    }
}

This is my build.gradle experemental gradle file:

apply plugin: 'com.android.model.application'

model {

    repositories {
        libs(PrebuiltLibraries) {
            QtStaticLibrary {
                headers.srcDir file("..PathToLib/TestAndroidThreadsLib").absolutePath
                binaries.withType(StaticLibraryBinary) {
                    def myStaticLibPath = "src/main/jniLibs/${targetPlatform.getName()}/libTestAndroidThreadsLib.a"
                    staticLibraryFile = file("${myStaticLibPath}")
                }
            }
            QCoreSharedLibrary {
                binaries.withType(SharedLibraryBinary) {
                    def coreLibPath = "src/main/jniLibs/${targetPlatform.getName()}/libQt5Core.so"
                    sharedLibraryFile = file("${coreLibPath}")
                }
            }
            QNetSharedLibrary {
                binaries.withType(SharedLibraryBinary) {
                    def networkLibPath = "src/main/jniLibs/${targetPlatform.getName()}/libQt5Network.so"
                    sharedLibraryFile = file("${networkLibPath}")
                }
            }
        }
    }

    android {
        compileSdkVersion 23
        buildToolsVersion "23.0.3"

        defaultConfig {
            minSdkVersion.apiLevel 18
            targetSdkVersion.apiLevel 21
            versionCode 1
            versionName "1.0"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles.add(file('proguard-rules.pro'))
            }
        }

        sources {
            main {
                jni {
                    dependencies {
                        library "QtStaticLibrary" linkage "static"
                        library "QCoreSharedLibrary" linkage "shared"
                        library "QNetSharedLibrary" linkage "shared"
                    }
                }
            }
        }

        ndk {
            moduleName = "communication"
            cppFlags.add("-std=c++11")
            stl "gnustl_shared"

            cppFlags.add('-I' + file("/Volumes/Transcend/Qt/5.7/android_armv7/include").absolutePath)
            cppFlags.add('-I' + file("/Volumes/Transcend/Qt/5.7/android_armv7/include/QtCore").absolutePath)

            abiFilters.addAll([
                    "x86",
                    "armeabi-v7a"
            ])
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'

    compile 'com.android.support:appcompat-v7:24.2.1'
}

It would be great if somebody tell what I'm doing wrong and why the error in this line of code:

QNetworkReply * reply = networkAccessManager.get(request);

only occurs on x86 devices and on devices with Android version less then 6.0 and only from native Android project (from QtCreator all works without errors). Thanks for help.