QML Debugger: Unable to listen to port 45339

I am trying to run QtCreator debugger on an android device in order to provide feedback for QTBUG-52949 (code is https://github.com/FabriceSalvaire/qt5-bugs/tree/master/android-custom-activity), but it hangs with this message:

Debugging starts
E/Zygote ( 8234): MountEmulatedStorage()
E/Zygote ( 8234): v2
I/libpersona( 8234): KNOX_SDCARD checking this for 10280
I/libpersona( 8234): KNOX_SDCARD not a persona
I/ActivityManager( 894): Start proc org.qt5_bugs for activity org.qt5_bugs/.Qt5BugsActivity: pid=8234 uid=10280 gids=

Unknown macro: {50280, 9997}

abi=armeabi-v7a
I/SELinux ( 8234): Function: selinux_compare_spd_ram, SPD-policy is existed. and_ver=SEPF_SM-G900F_5.0 ver=27
I/SELinux ( 8234): Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_SM-G900F_5.0-1_0032
E/SELinux ( 8234): [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
I/art ( 8234): Late-enabling -Xcheck:jni
D/TimaKeyStoreProvider( 8234): TimaSignature is unavailable
D/ActivityThread( 8234): Added TimaKeyStore provider
D/ResourcesManager( 8234): creating new AssetManager and set to /data/app/org.qt5_bugs-2/base.apk
I/Qt5BugsActivity( 8234): >>>>>>>>>> Qt5BugsActivity.onCreate <<<<<<<<<<
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/ic_ab_back_holo_light_am.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/sym_def_app_icon.png
I/Qt ( 8234): qt start
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/scrubber_control_disabled_holo.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/scrubber_control_pressed_holo.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/scrubber_control_focused_holo.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/scrubber_control_normal_holo.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/text_select_handle_middle.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xhdpi-v4/btn_check_buttonless_on.png
V/BitmapFactory( 8234): DecodeImagePath(decodeResourceStream3) : res/drawable-xhdpi-v4/btn_check_buttonless_off.png
D/ ( 8234): (null):0 ((null)): QML debugging is enabled. Only use this in a safe environment.
I/Qt JAVA ( 8234): DEBUGGER: extra parameters: Bundle[

Unknown macro: {debug_ping=true, gdbserver_socket=/data/data/org.qt5_bugs/debug-socket, qml_debug=true, gdbserver_command=/data/data/org.qt5_bugs/lib/libgdbserver.so --multi +/data/data/org.qt5_bugs/debug-socket, qmljsdebugger=port}

]
I/Qt JAVA ( 8234): DEBUGGER: removing gdb socket /data/data/org.qt5_bugs/debug-socket
I/Qt JAVA ( 8234): DEBUGGER: starting /data/data/org.qt5_bugs/lib/libgdbserver.so --multi +/data/data/org.qt5_bugs/debug-socket
I/Qt JAVA ( 8234): DEBUGGER: gdbserver started
I/Qt JAVA ( 8234): DEBUGGER: waiting for socket at /data/data/org.qt5_bugs/debug-socket, attempt 0
I/Qt JAVA ( 8234): DEBUGGER: waiting for socket at /data/data/org.qt5_bugs/debug-socket, attempt 1
I/Qt JAVA ( 8234): DEBUGGER: socket ok
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Debug socket accepted
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
Could not load shared library symbols for 124 libraries, e.g. /system/bin/linker.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.I/Qt JAVA ( 8234): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA ( 8234): DEBUGGER: go to sleep
I/Qt JAVA ( 8234): DEBUGGER: Incoming socket OK
I/Qt JAVA ( 8234): DEBUGGER: Got pid acknowledgment
I/Qt JAVA ( 8234): DEBUGGER: ping not requested
I/Qt JAVA ( 8234): DEBUGGER: pong not requested
D/Activity( 8234): performCreate Call secproduct feature valuefalse
D/Activity( 8234): performCreate Call debug elastic valuetrue
D/OpenGLRenderer( 8234): Render dirty regions requested: true
I/Adreno-EGL( 8234): <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: ()
I/Adreno-EGL( 8234): OpenGL ES Shader Compiler Version: E031.25.01.03
I/Adreno-EGL( 8234): Build Date: 03/03/15 Tue
I/Adreno-EGL( 8234): Local Branch: LA.BF.1.1_RB1_20150108_025_1077123_1158499
I/Adreno-EGL( 8234): Remote Branch:
I/Adreno-EGL( 8234): Local Patches:
I/Adreno-EGL( 8234): Reconstruct Branch:
I/OpenGLRenderer( 8234): Initialized EGL, version 1.4
I/OpenGLRenderer( 8234): HWUI protection enabled for context , &this =0xa10090b0 ,&mEglDisplay = 1 , &mEglConfig = 8
D/OpenGLRenderer( 8234): Enabling debug mode 0
I/Timeline( 8234): Timeline: Activity_idle id: android.os.BinderProxy@8f9366c time:197697

W/libandroid-custom-activity.so( 8234): (null):0 ((null)): QML Debugger: Unable to listen to port 45339.

I/InputDispatcher( 894): Delivering touch to (8234): action: 0x0, toolType: 1
D/ViewRootImpl( 8234): ViewPostImeInputStage ACTION_DOWN
I/InputDispatcher( 894): Delivering touch to (8234): action: 0x1, toolType: 1
I/InputDispatcher( 894): Delivering touch to (8234): action: 0x0, toolType: 1
D/ViewRootImpl( 8234): ViewPostImeInputStage ACTION_DOWN
I/InputDispatcher( 894): Delivering touch to (8234): action: 0x1, toolType: 1

QtCreator messages on console:

QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread
QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread
SOFT ASSERT: "d->remoteSetupState() == RemoteSetupNone || d->remoteSetupState() == RemoteSetupSucceeded" in file debuggerengine.cpp, line 791
Debugger::Internal::GdbRemoteServerEngine(0x812b590, name = "GdbEngine") remoteSetupState 1
SOFT ASSERT: "d->remoteSetupState() == RemoteSetupNone || d->remoteSetupState() == RemoteSetupSucceeded" in file debuggerengine.cpp, line 791
Debugger::Internal::QmlCppEngine(0x7ea2b50, name = "QmlCppEngine") remoteSetupState 1
SOFT ASSERT: "state() == EngineSetupOk" in file debuggerengine.cpp, line 802
*** UNEXPECTED STATE TRANSITION:  Debugger::Internal::QmlEngine(0x7eaadf0, name = "QmlEngine") "State changed from EngineSetupRequested(1) to InferiorSetupRequested(4)"
SOFT ASSERT: "false" in file gdb/gdbengine.cpp, line 1450
UNEXPECTED STATE: 4  WANTED: 14 IN gdb/gdbengine.cpp:1453
UNEXPECTED STATE: 4  WANTED: 14 IN gdb/gdbengine.cpp:1466
UNEXPECTED STATE: 4  WANTED: 14 IN gdb/gdbengine.cpp:1538
SOFT ASSERT: "state() == EngineSetupRequested || state() == EngineSetupFailed || state() == DebuggerFinished" in file debuggerengine.cpp, line 895
Debugger::Internal::QmlCppEngine(0x7ea2b50, name = "QmlCppEngine") InferiorSetupRequested
SOFT ASSERT: "state() == EngineSetupRequested" in file gdb/remotegdbserveradapter.cpp, line 479
InferiorSetupOk
SOFT ASSERT: "state() == EngineSetupRequested || state() == EngineSetupFailed || state() == DebuggerFinished" in file debuggerengine.cpp, line 895
Debugger::Internal::GdbRemoteServerEngine(0x812b590, name = "GdbEngine") InferiorSetupOk
SOFT ASSERT: "state() == EngineSetupRequested || state() == EngineSetupFailed || state() == DebuggerFinished" in file debuggerengine.cpp, line 895
Debugger::Internal::QmlEngine(0x7eaadf0, name = "QmlEngine") InferiorSetupOk
SOFT ASSERT: "state() == EngineSetupRequested" in file debuggerengine.cpp, line 793
Debugger::Internal::QmlEngine(0x7eaadf0, name = "QmlEngine") InferiorSetupOk
*** UNEXPECTED STATE TRANSITION:  Debugger::Internal::QmlEngine(0x7eaadf0, name = "QmlEngine") "State changed from InferiorSetupOk(6) to EngineSetupOk(3)"
SOFT ASSERT: "state() == InferiorSetupOk" in file debuggerengine.cpp, line 840
*** UNEXPECTED STATE TRANSITION:  Debugger::Internal::QmlEngine(0x7eaadf0, name = "QmlEngine") "State changed from EngineSetupOk(3) to EngineRunRequested(7)"