Can't debug my Qt app under Android 6

I create a simply QWidget application (using QtCreator wizard). Then I create abreakpoint in the code (in main function for instance), and I start the debugger.

With a Android 4.4 (Nexus 5), or Android 5.1 (Nexus 6), the program stops at specified breakpoint.

With a Android 6 (Galaxy Tab A) or Android 7 (Galaxy S3), I get the error:

and then, even if the app runs on the device, breakpoints are ignored and I cannot debug my app.

Log window reports:

11:08:31: Debugging starts
E Zygote : v2
I libpersona: KNOX_SDCARD checking this for 10196
I libpersona: KNOX_SDCARD not a persona
I SELinux : Function: selinux_compare_spd_ram, index[1], SPD-policy is existed. and_ver=SEPF_SM-T550_5.0.2-1 ver=51
W SELinux : Function: selinux_compare_spd_ram, index[1], priority [2], priority version is VE=SEPF_SECMOBILE_6.0.1_0030
W SELinux : SELinux: seapp_context_lookup: seinfo=default, level=s0:c512,c768, pkgname=org.qtproject.example.TestAndroid
I art : Late-enabling -Xcheck:jni
D TimaKeyStoreProvider: TimaSignature is unavailable
D ActivityThread: Added TimaKeyStore provider
W ActivityThread: Application org.qtproject.example.TestAndroid is waiting for the debugger on port 8100...
I System.out: Sending WAIT chunk
I art : Debugger is active
I System.out: Debugger has connected
I System.out: waiting for debugger to settle...
11:08:32: Debugging has finished
I System.out: waiting for debugger to settle...
I System.out: waiting for debugger to settle...
I System.out: waiting for debugger to settle...
I System.out: waiting for debugger to settle...
I System.out: waiting for debugger to settle...
I System.out: waiting for debugger to settle...
I System.out: debugger has settled (1391)
W System : ClassLoader referenced unknown path:
I QtCore : Start
W linker : /data/app/org.qtproject.example.TestAndroid-1/lib/arm/libQt5Gui.so: unused DT entry: type 0x1d arg 0x594c7
W linker : /data/app/org.qtproject.example.TestAndroid-1/lib/arm/libQt5Gui.so: unsupported flags DT_FLAGS_1=0x80
W linker : /data/app/org.qtproject.example.TestAndroid-1/lib/arm/libQt5Widgets.so: unused DT entry: type 0x1d arg 0x6c6fd
W linker : /data/app/org.qtproject.example.TestAndroid-1/lib/arm/libQt5Widgets.so: unsupported flags DT_FLAGS_1=0x80
W linker : /data/data/org.qtproject.example.TestAndroid/qt-reserved-files/plugins/platforms/android/libqtforandroid.so: unused DT entry: type 0x1d arg 0x921c
W linker : /data/data/org.qtproject.example.TestAndroid/qt-reserved-files/plugins/platforms/android/libqtforandroid.so: unsupported flags DT_FLAGS_1=0x80
I Qt : qt started
I art : Debugger is no longer active
D SecWifiDisplayUtil: Metadata value : SecSettings2
D ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{9f0c8ea I.E...... R.....ID 0,0-0,0}
D OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
I Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: Nondeterministic_AU_msm8916_32_LA.BR.1.2.6_RB1__release_AU (Ia10634f51b)
I Adreno-EGL: OpenGL ES Shader Compiler Version: XE031.06.00.05
I Adreno-EGL: Build Date: 01/04/16 Mon
I Adreno-EGL: Local Branch:
I Adreno-EGL: Remote Branch: quic/LA.BR.1.2.6_rb1.7
I Adreno-EGL: Local Patches: NONE
I Adreno-EGL: Reconstruct Branch: NOTHING
I OpenGLRenderer: Initialized EGL, version 1.4
W linker : /data/app/org.qtproject.example.TestAndroid-1/lib/arm/libTestAndroid.so: unused DT entry: type 0x1d arg 0x1059
D ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 24 - 0, 0) vi=Rect(0, 24 - 0, 0) or=2
D libGLESv1: DTS_GLAPI : DTS is not allowed for Package : org.qtproject.example.TestAndroid
I Timeline: Timeline: Activity_idle id: android.os.BinderProxy@348216e time:956355977
V ActivityThread: updateVisibility : ActivityRecord{8b20e24 token=android.os.BinderProxy@348216e {org.qtproject.example.TestAndroid/org.qtproject.qt5.android.bindings.QtActivity}} show : false