My Android QT app crashes at qt_qFindChild_helper.

I have an Android QT app with more than has 14K active users at the moment of writing this post. The app is relatively stable, its crash rate is 0.34%:

but there is a specific user with Xiaomi Redmi 3 (ido), Android 5.1 that cannot even run the app on his device. When he starts the app, a white screen is displayed and then the app crashes. Google Play Console reports that he attempted to start the app 7 times, but with no success:

The backtrace is

*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 0, tid: 0 >>> net.geographx.LinesGame <<<

backtrace:
  #00  pc 00000000002b60e4  /data/app/net.geographx.LinesGame-1/lib/arm64/libQt5Core.so (qt_qFindChild_helper(QObject const*, QString const&, QMetaObject const&, QFlags<Qt::FindChildOption>)+48)
  #01  pc 0000000000091c88  /data/app/net.geographx.LinesGame-1/lib/arm64/libLinesGameQt.so (main+4956)
  #02  pc 0000000000032290  /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/libqtforandroid.so

QT version I build the app with is 5.13.0.

I reproduced the crash on emulator with Android 5.1 and Google APIs:

D/InterstitialAdWrapper( 4011): Creating InterstitialAd...
D/InterstitialAdWrapper( 4011): In the onStart() event
D/InterstitialAdWrapper( 4011): In the onResume() event
D/OpenGLRenderer( 4011): Use EGL_SWAP_BEHAVIOR_PRESERVED: true
D/Atlas   ( 4011): Validating map...
V/WindowManager( 1501): Adding window Window{15c17751 u0 net.geographx.LinesGame/net.geographx.MainActivity} at 2 of 8 (before Window{1071472c u0 Starting net.geogra                        phx.LinesGame})
I/OpenGLRenderer( 4011): Initialized EGL, version 1.4
D/        ( 4011): HostConnection::get() New Host Connection established 0x7f085fb5b320, tid 4066
W/OpenGLRenderer( 4011): Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
D/EGL_emulation( 4011): eglCreateContext: 0x7f085faa4660: maj 2 min 0 rcv 2
D/EGL_emulation( 4011): eglMakeCurrent: 0x7f085faa4660: ver 2 0 (tinfo 0x7f085fa9d6e0)
D/OpenGLRenderer( 4011): Enabling debug mode 0
D/EGL_emulation( 4011): eglMakeCurrent: 0x7f085faa4660: ver 2 0 (tinfo 0x7f085fa9d6e0)
V/SysInfo ( 4011): DisplayMetrics Width: 1776, Height: 1080, Pixel Ratio: 1.000000, densityDpi: 480, scaledDensity: 3.000000, xdpi: 480.000000, ydpi: 480.000000, den                        sity: 3.000000
I/ActivityManager( 1501): Displayed net.geographx.LinesGame/net.geographx.MainActivity: +1s164ms
D/libLinesGameQt.so( 4011): Translation file has been loaded successfully:  "LinesGame_en"
D/Lines   ( 4011): App version:  "2.5.04, #116"
D/Lines   ( 4011): QT/SysInfo: Device Pixel Ratio: 3  Screen DPI:  160.194
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
W/linker  ( 4011): /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x1d arg 0x4a2
W/linker  ( 4011): Unsupported flags DT_FLAGS_1=0x80
W/linker  ( 4011): /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x6ffffffe arg 0xb98
W/linker  ( 4011): /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x6fffffff arg 0x1
W/Lines   ( 4011): QQmlApplicationEngine failed to load component
W/Lines   ( 4011): qrc:/main.qml:1 plugin cannot be loaded for module "QtQuick": Cannot load library /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick                        .2/libqtquick2plugin.so: (dlopen failed: library "libQt5Quick.so" not found)
W/Lines   ( 4011):
F/libc    ( 4011): Fatal signal 11 (SIGSEGV), code 128, fault addr 0x0 in tid 4029 (qtMainLoopThrea)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
I/DEBUG   ( 1129): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   ( 1129): Build fingerprint: 'Android/sdk_google_phone_x86_64/generic_x86_64:5.1.1/LMY48X/5525941:userdebug/test-keys'
I/DEBUG   ( 1129): Revision: '0'
I/DEBUG   ( 1129): ABI: 'x86_64'
I/DEBUG   ( 1129): pid: 4011, tid: 4029, name: qtMainLoopThrea  >>> net.geographx.LinesGame <<<
I/DEBUG   ( 1129): signal 11 (SIGSEGV), code 128 (SI_KERNEL), fault addr 0x0
I/DEBUG   ( 1129):     rax 50ff078b480674ff  rbx 00007f085fbb9e60  rcx 0000000000000001  rdx 00007f08542d16b8
I/DEBUG   ( 1129):     rsi 00007f0862b1ce60  rdi 00007f0856d89238
I/DEBUG   ( 1129):     r8  00007f0850bf55dc  r9  000000000000000a  r10 00007f0850bf55c8  r11 0000000000000018
I/DEBUG   ( 1129):     r12 00007f08568f6b70  r13 00007f0862b1ce60  r14 00007f0856d89238  r15 00007f08542d16b8
I/DEBUG   ( 1129):     cs  0000000000000033  ss  000000000000002b
I/DEBUG   ( 1129):     rip 00007f08569ff0a8  rbp 00007f085f928aa0  rsp 00007f0862b1cd50  eflags 0000000000010202
I/DEBUG   ( 1129):
I/DEBUG   ( 1129): backtrace:
I/DEBUG   ( 1129):     #00 pc 00000000002a80a8  /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Core.so (qt_qFindChild_helper(QObject const*, QString const&, QM                        etaObject const&, QFlags<Qt::FindChildOption>)+56)
I/DEBUG   ( 1129):     #01 pc 000000000009e365  /data/app/net.geographx.LinesGame-1/lib/x86_64/libLinesGameQt.so (main+5141)
I/DEBUG   ( 1129):     #02 pc 0000000000031fb0  /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/libqtforandroid.so
I/DEBUG   ( 1129):     #03 pc 0000000000322489  /data/dalvik-cache/x86_64/data@app@net.geographx.LinesGame-1@base.apk@classes.dex
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
I/DEBUG   ( 1129):
I/DEBUG   ( 1129): Tombstone written to: /data/tombstones/tombstone_02
W/art     ( 4011): Long monitor contention event with owner method=boolean android.os.MessageQueue.enqueueMessage(android.os.Message, long) from MessageQueue.java:32                        3 waiters=0 for 252ms
I/WindowState( 1501): WIN DEATH: Window{15c17751 u0 net.geographx.LinesGame/net.geographx.MainActivity}
I/Zygote  ( 1135): Process 4011 exited due to signal (11)
I/ActivityManager( 1501): Process net.geographx.LinesGame (pid 4011) has died
W/ActivityManager( 1501): Force removing ActivityRecord{b519185 u0 net.geographx.LinesGame/net.geographx.MainActivity t6}: app died, no saved state
W/DropBoxManagerService( 1501): Dropping: data_app_native_crash (1542 > 0 bytes)
I/OpenGLRenderer( 1501): Initialized EGL, version 1.4
D/EGL_emulation( 1501): eglCreateContext: 0x7f0854597200: maj 2 min 0 rcv 2
D/EGL_emulation( 1501): eglMakeCurrent: 0x7f0854597200: ver 2 0 (tinfo 0x7f0854524f80)
D/EGL_emulation( 2279): eglMakeCurrent: 0xe2078100: ver 2 0 (tinfo 0xf43fd670)
D/EGL_emulation( 1501): eglMakeCurrent: 0x7f0854597200: ver 2 0 (tinfo 0x7f0854524f80)
D/TaskPersister( 1501): removeObsoleteFile: deleting file=5_task.xml
I/Choreographer( 1501): Skipped 283 frames!  The application may be doing too much work on its main thread.
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
D/EGL_emulation( 1901): eglMakeCurrent: 0x7f086938ec40: ver 2 0 (tinfo 0x7f085f927cc0)
I/installd( 1133): free_cache(118056141) avail 30666752
W/installd( 1133): Couldn't find Android in /data/media/0/
I/installd( 1133): Collected cache files: 29 directories, 0 files
I/installd( 1133): DEL CONTENTS /data/data/com.google.android.gms/cache/
W/PackageManager( 1501): Couldn't clear application caches
D/EGL_emulation( 1501): eglMakeCurrent: 0x7f0854597200: ver 2 0 (tinfo 0x7f0854524f80)
W/InputMethodManagerService( 1501): Got RemoteException sending setActive(false) notification to pid 4011 uid 10058
I/ActivityManager( 1501): Killing 3549:com.android.exchange/u0a27 (adj 15): empty for 1800s
I/ActivityManager( 1501): Killing 3515:com.android.browser/u0a16 (adj 15): empty for 1800s
I/UsageStatsService( 1501): User[0] Flushing usage stats to disk
I/ActivityManager( 1501): Killing 2804:com.android.providers.calendar/u0a1 (adj 15): empty for 1842s
I/ActivityManager( 1501): Killing 2774:com.google.android.calendar/u0a18 (adj 15): empty for 1843s
E/WakeLock( 2474): GCM_HB_ALARM release without a matched acquire!
I/EventLogChimeraService( 2438): Aggregate from 1575036105485 (log), 1575036105485 (data)
W/DropBoxManagerService( 1501): Dropping: event_data (39 > 0 bytes)
W/BatteryStatsImpl( 1501): Couldn't get kernel wake lock stats
I/ProcessStatsService( 1501): Prepared write state in 1ms
E/WakeLock( 2474): GCM_HB_ALARM release without a matched acquire!
I/EventLogChimeraService( 2438): Aggregate from 1575037785527 (log), 1575037785527 (data)
W/DropBoxManagerService( 1501): Dropping: event_data (39 > 0 bytes)
adb shell "cat /data/tombstones/tombstone_02
cannot get siginfo for 4080: Invalid argument
--------- log system
11-29 14:18:24.762  4011  4026 W ResourcesManager: Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
11-29 14:18:24.762  4011  4026 W ResourcesManager: Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
--------- log main
11-29 14:18:24.701  4011  4011 I art     : Not late-enabling -Xcheck:jni (already on)
11-29 14:18:24.765  4011  4018 E art     : Failed sending reply to debugger: Broken pipe
11-29 14:18:24.765  4011  4018 I art     : Debugger is no longer active
11-29 14:18:24.781  4011  4023 I art     : Background sticky concurrent mark sweep GC freed 5068(277KB) AllocSpace objects, 0(0B) LOS objects, 17% free, 944KB/1143KB, paused 7.880ms total 23.963ms
11-29 14:18:24.849  4011  4026 I DynamiteModule: Considering local module com.google.android.gms.ads.dynamite:0 and remote module com.google.android.gms.ads.dynamite:11140
11-29 14:18:24.849  4011  4026 I DynamiteModule: Selected remote version of com.google.android.gms.ads.dynamite, version >= 11140
11-29 14:18:24.850  4011  4026 V DynamiteModule: Dynamite loader version >= 2, using loadModule2NoCrashUtils
11-29 14:18:24.856  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libc++_shared.so: unused DT entry: type 0x6ffffef5 arg 0x28918
11-29 14:18:24.856  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libc++_shared.so: unused DT entry: type 0x6ffffffe arg 0x32a88
11-29 14:18:24.856  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libc++_shared.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.858  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Core.so: unused DT entry: type 0x6ffffffe arg 0x6decc
11-29 14:18:24.858  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Core.so: unused DT entry: type 0x6fffffff arg 0x3
11-29 14:18:24.859  4011  4029 I QtCore  : Start
11-29 14:18:24.859  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5AndroidExtras.so: unused DT entry: type 0x1d arg 0x7135
11-29 14:18:24.859  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.859  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5AndroidExtras.so: unused DT entry: type 0x6ffffffe arg 0xbe94
11-29 14:18:24.859  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5AndroidExtras.so: unused DT entry: type 0x6fffffff arg 0x1
11-29 14:18:24.859  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Gui.so: unused DT entry: type 0x1d arg 0x5a2c6
11-29 14:18:24.859  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.859  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Gui.so: unused DT entry: type 0x6ffffffe arg 0xa4860
11-29 14:18:24.860  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Gui.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.862  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Network.so: unused DT entry: type 0x1d arg 0x14c5f
11-29 14:18:24.862  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.862  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Network.so: unused DT entry: type 0x6ffffffe arg 0x2775c
11-29 14:18:24.862  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Network.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.869  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Qml.so: unused DT entry: type 0x1d arg 0x32e15
11-29 14:18:24.869  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.869  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Qml.so: unused DT entry: type 0x6ffffffe arg 0x59974
11-29 14:18:24.869  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Qml.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.887  4011  4030 I DynamiteModule: Considering local module com.google.android.gms.measurement.dynamite:7 and remote module com.google.android.gms.measurement.dynamite:5
11-29 14:18:24.887  4011  4030 I DynamiteModule: Selected local version of com.google.android.gms.measurement.dynamite
11-29 14:18:24.910  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Quick.so: unused DT entry: type 0x1d arg 0x4d8e3
11-29 14:18:24.910  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.910  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Quick.so: unused DT entry: type 0x6ffffffe arg 0x8a53c
11-29 14:18:24.910  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Quick.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.916  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickTemplates2.so: unused DT entry: type 0x1d arg 0x26eec
11-29 14:18:24.916  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.916  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickTemplates2.so: unused DT entry: type 0x6ffffffe arg 0x46090
11-29 14:18:24.916  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickTemplates2.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.920  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickControls2.so: unused DT entry: type 0x1d arg 0x75b8
11-29 14:18:24.920  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.920  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickControls2.so: unused DT entry: type 0x6ffffffe arg 0xdf70
11-29 14:18:24.920  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickControls2.so: unused DT entry: type 0x6fffffff arg 0x1
11-29 14:18:24.921  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Widgets.so: unused DT entry: type 0x1d arg 0x6cd1f
11-29 14:18:24.921  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.921  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Widgets.so: unused DT entry: type 0x6ffffffe arg 0xc7a44
11-29 14:18:24.921  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Widgets.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.946  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Svg.so: unused DT entry: type 0x1d arg 0x8d48
11-29 14:18:24.946  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.946  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Svg.so: unused DT entry: type 0x6ffffffe arg 0x11cf8
11-29 14:18:24.946  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5Svg.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.948  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickParticles.so: unused DT entry: type 0x1d arg 0x5453
11-29 14:18:24.948  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.948  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickParticles.so: unused DT entry: type 0x6ffffffe arg 0x9ce4
11-29 14:18:24.948  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5QuickParticles.so: unused DT entry: type 0x6fffffff arg 0x2
11-29 14:18:24.950  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5RemoteObjects.so: unused DT entry: type 0x1d arg 0x793d
11-29 14:18:24.950  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.950  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5RemoteObjects.so: unused DT entry: type 0x6ffffffe arg 0xde64
11-29 14:18:24.950  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libQt5RemoteObjects.so: unused DT entry: type 0x6fffffff arg 0x1
11-29 14:18:24.951  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/libqtforandroid.so: unused DT entry: type 0x1d arg 0xa3d3
11-29 14:18:24.951  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.951  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/libqtforandroid.so: unused DT entry: type 0x6ffffffe arg 0x14344
11-29 14:18:24.951  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/libqtforandroid.so: unused DT entry: type 0x6fffffff arg 0x3
11-29 14:18:24.956  4011  4029 I Qt      : qt started
11-29 14:18:24.956  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/bearer/libqandroidbearer.so: unused DT entry: type 0x1d arg 0x16c0
11-29 14:18:24.956  4011  4029 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:24.956  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/bearer/libqandroidbearer.so: unused DT entry: type 0x6ffffffe arg 0x2dac
11-29 14:18:24.956  4011  4029 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/bearer/libqandroidbearer.so: unused DT entry: type 0x6fffffff arg 0x1
11-29 14:18:24.957  4011  4029 I Qt JAVA : Can't find '/data/data/net.geographx.LinesGame/qt-reserved-files/lib/libQt5QuickParticles.so'
11-29 14:18:24.959  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libLinesGameQt.so: unused DT entry: type 0x6ffffef5 arg 0x30680
11-29 14:18:24.959  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libLinesGameQt.so: unused DT entry: type 0x1d arg 0x215e0
11-29 14:18:24.959  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libLinesGameQt.so: unused DT entry: type 0x6ffffffe arg 0x3aaa8
11-29 14:18:24.959  4011  4029 W linker  : /data/app/net.geographx.LinesGame-1/lib/x86_64/libLinesGameQt.so: unused DT entry: type 0x6fffffff arg 0x3
11-29 14:18:24.989  4011  4011 D InterstitialAdWrapper: In the onCreate() event
11-29 14:18:24.991  4011  4011 D InterstitialAdWrapper: Initializing the Mobile Ads SDK...
11-29 14:18:25.030  4011  4011 I WebViewFactory: Loading com.android.webview version 39 (5525941-x86_64) (code 300008)
11-29 14:18:25.054  4011  4011 I LibraryLoader: Time to load native libraries: 6 ms (timestamps 2886-2892)
11-29 14:18:25.054  4011  4011 I LibraryLoader: Expected native library version number "",actual native library version number ""
11-29 14:18:25.057  4011  4011 V WebViewChromiumFactoryProvider: Binding Chromium to main looper Looper (main, tid 1) {24a94992}
11-29 14:18:25.057  4011  4011 I LibraryLoader: Expected native library version number "",actual native library version number ""
11-29 14:18:25.057  4011  4011 I chromium: [INFO:library_loader_hooks.cc(104)] Chromium logging enabled: level = 0, default verbosity = 0
11-29 14:18:25.059  4011  4011 I BrowserStartupController: Initializing chromium process, singleProcess=true
11-29 14:18:25.059  4011  4011 W art     : Attempt to remove local handle scope entry from IRT, ignoring
11-29 14:18:25.074  4011  4011 W chromium: [WARNING:resource_bundle.cc(304)] locale_file_path.empty()
11-29 14:18:25.074  4011  4011 I chromium: [INFO:aw_browser_main_parts.cc(65)] Load from apk succesful, fd=34 off=46184 len=3037
11-29 14:18:25.074  4011  4011 I chromium: [INFO:aw_browser_main_parts.cc(78)] Loading webviewchromium.pak from, fd:35 off:229484 len:1089587
11-29 14:18:25.077  4011  4046 W AudioManagerAndroid: Requires BLUETOOTH permission
11-29 14:18:25.088  4011  4011 D         : HostConnection::get() New Host Connection established 0x7f08693f3270, tid 4011
11-29 14:18:25.114  4011  4033 I FA-Ads  : App measurement is starting up, version: 16250
11-29 14:18:25.114  4011  4033 I FA-Ads  : To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
11-29 14:18:25.144  4011  4011 D EGL_emulation: eglCreateContext: 0x7f08693ca060: maj 2 min 0 rcv 2
11-29 14:18:25.146  4011  4011 D EGL_emulation: eglMakeCurrent: 0x7f08693ca060: ver 2 0 (tinfo 0x7f085f97ab20)
11-29 14:18:25.191  4011  4011 W chromium: [WARNING:data_reduction_proxy_settings.cc(331)] SPDY proxy OFF at startup
11-29 14:18:25.201  4011  4011 W art     : Attempt to remove local handle scope entry from IRT, ignoring
11-29 14:18:25.203  4011  4011 W AwContents: onDetachedFromWindow called when already detached. Ignoring
11-29 14:18:25.207  4011  4011 W art     : Attempt to remove local handle scope entry from IRT, ignoring
11-29 14:18:25.207  4011  4011 W art     : Attempt to remove local handle scope entry from IRT, ignoring
11-29 14:18:25.221  4011  4011 D InterstitialAdWrapper: Creating InterstitialAd...
11-29 14:18:25.222  4011  4011 D InterstitialAdWrapper: In the onStart() event
11-29 14:18:25.223  4011  4011 D InterstitialAdWrapper: In the onResume() event
11-29 14:18:25.227  4011  4066 D OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
11-29 14:18:25.245  4011  4011 D Atlas   : Validating map...
11-29 14:18:25.280  4011  4066 I OpenGLRenderer: Initialized EGL, version 1.4
11-29 14:18:25.281  4011  4066 D         : HostConnection::get() New Host Connection established 0x7f085fb5b320, tid 4066
11-29 14:18:25.289  4011  4066 W OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
11-29 14:18:25.312  4011  4066 D EGL_emulation: eglCreateContext: 0x7f085faa4660: maj 2 min 0 rcv 2
11-29 14:18:25.448  4011  4066 D EGL_emulation: eglMakeCurrent: 0x7f085faa4660: ver 2 0 (tinfo 0x7f085fa9d6e0)
11-29 14:18:25.465  4011  4066 D OpenGLRenderer: Enabling debug mode 0
11-29 14:18:25.489  4011  4066 D EGL_emulation: eglMakeCurrent: 0x7f085faa4660: ver 2 0 (tinfo 0x7f085fa9d6e0)
11-29 14:18:25.554  4011  4029 V SysInfo : DisplayMetrics Width: 1776, Height: 1080, Pixel Ratio: 1.000000, densityDpi: 480, scaledDensity: 3.000000, xdpi: 480.000000, ydpi: 480.000000, density: 3.000000
11-29 14:18:25.874  4011  4029 D libLinesGameQt.so: Translation file has been loaded successfully:  "LinesGame_en"
11-29 14:18:25.874  4011  4029 D Lines   : App version:  "2.5.04, #116"
11-29 14:18:25.884  4011  4029 D Lines   : QT/SysInfo: Device Pixel Ratio: 3  Screen DPI:  160.194
11-29 14:18:25.892  4011  4080 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x1d arg 0x4a2
11-29 14:18:25.892  4011  4080 W linker  : Unsupported flags DT_FLAGS_1=0x80
11-29 14:18:25.892  4011  4080 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x6ffffffe arg 0xb98
11-29 14:18:25.892  4011  4080 W linker  : /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: unused DT entry: type 0x6fffffff arg 0x1
11-29 14:18:25.895  4011  4029 W Lines   : QQmlApplicationEngine failed to load component
11-29 14:18:25.895  4011  4029 W Lines   : qrc:/main.qml:1 plugin cannot be loaded for module "QtQuick": Cannot load library /data/data/net.geographx.LinesGame/qt-reserved-files/qml/QtQuick.2/libqtquick2plugin.so: (dlopen failed: library "libQt5Quick.so" not found)

I fixed this by moving MobileAds.initialize call before super.onCreate in my Android activity:

public class MainActivity extends org.qtproject.qt5.android.bindings.QtActivity
{
    ...
    @Override
    public void onCreate(android.os.Bundle savedInstanceState)
    {
        Log.d(TAG, "In the onCreate() event");

        boolean available = isGooglePlayServicesAvailable();

        if (available)
        {
            Log.d(TAG, "Initializing the Mobile Ads SDK...");
            com.google.android.gms.ads.MobileAds.initialize(this);
        }
        else
        {
            Log.d(TAG, "Google Play Services are not Available");
        }

        super.onCreate(savedInstanceState);

        if (available)
        {
            Log.d(TAG, "Creating InterstitialAd...");

            // Create the InterstitialAd and set the adUnitId.
            iAd = new com.google.android.gms.ads.InterstitialAd(this);
            iAd.setAdUnitId(AD_UNIT_ID);
        }
    }
    ...
}

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