PyQt5 and tensorflowlite causes crashes?

Herald_Poro

Hi, I'm running on Linux based system on Python 3.6 since tensorflow only works on 3.6 on my system and I was trying to make inferences on a tensorflow lite model with Qt acting as the GUI.

However, by just even importing the tensorflow library, the whole program crashes with

2021-06-22 21:37:11.656636: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0
QObject::moveToThread: Current thread (0x3aa3de0) is not the object's thread (0x5959930).
Cannot move to target thread (0x3aa3de0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "~/.local/lib/python3.6/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

What should I do to overcome this problem?
Thanks.

JonB

@Herald_Poro
Strangely, you seem to have exactly the same issue as https://forum.qt.io/topic/127824/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb which is currently on-going. Unless you are that user too! Start by reading through that, and do the QT_DEBUG_PLUGINS=1 environment variable to see where you get.

Herald_Poro

@JonB
We're different people I'm afriad.
I've done the QT_DEBUG_PLUGINS=1 and the whole results are in the Google Drive link. (shorturl.at/kBGIJ)
However, this is the ending of the results which may be of use?

QFactoryLoader::QFactoryLoader() checking directory path "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archreq": 0,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archreq": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqvnc.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archreq": 0,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-glx.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-glx"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeGlxPlatformIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwebgl.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "/home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /home/<user>/.local/lib/python3.6/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
loaded library "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
QObject::moveToThread: Current thread (0x34c51b0) is not the object's thread (0x5512280).
Cannot move to target thread (0x34c51b0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

Aborted (core dumped)

While, running ldd /home/<username>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/libqxcb.so gave me:

	linux-vdso.so.1 (0x00007ffda3782000)
	libQt5XcbQpa-70670cdb.so.5.15.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libQt5XcbQpa-70670cdb.so.5.15.0 (0x00007f7fa85ca000)
	libfreetype-8d3bcff4.so.6.14.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libfreetype-8d3bcff4.so.6.14.0 (0x00007f7fa82fa000)
	libz-d8a329de.so.1.2.7 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libz-d8a329de.so.1.2.7 (0x00007f7fa80e3000)
	libQt5Gui-ca084835.so.5.15.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libQt5Gui-ca084835.so.5.15.0 (0x00007f7fa774c000)
	libQt5Core-d92f2856.so.5.15.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libQt5Core-d92f2856.so.5.15.0 (0x00007f7fa6ff4000)
	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f7fa6f51000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7fa6f2e000)
	libX11-xcb-1ae4fd0e.so.1.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libX11-xcb-1ae4fd0e.so.1.0.0 (0x00007f7fa6d2b000)
	libxcb-icccm-413c9f41.so.4.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-icccm-413c9f41.so.4.0.0 (0x00007f7fa6b25000)
	libxcb-image-e82a276d.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-image-e82a276d.so.0.0.0 (0x00007f7fa691d000)
	libxcb-shm-7a199f70.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-shm-7a199f70.so.0.0.0 (0x00007f7fa6715000)
	libxcb-keysyms-21015570.so.1.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-keysyms-21015570.so.1.0.0 (0x00007f7fa6511000)
	libxcb-randr-a96a5a87.so.0.1.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-randr-a96a5a87.so.0.1.0 (0x00007f7fa62fa000)
	libxcb-render-util-43ce00f5.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-render-util-43ce00f5.so.0.0.0 (0x00007f7fa60f4000)
	libxcb-render-637b984a.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-render-637b984a.so.0.0.0 (0x00007f7fa5ee0000)
	libxcb-shape-25c2b258.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-shape-25c2b258.so.0.0.0 (0x00007f7fa5cd8000)
	libxcb-sync-89374f40.so.1.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-sync-89374f40.so.1.0.0 (0x00007f7fa5acf000)
	libxcb-xfixes-9be3ba6f.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-xfixes-9be3ba6f.so.0.0.0 (0x00007f7fa58c3000)
	libxcb-xinerama-ae147f87.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-xinerama-ae147f87.so.0.0.0 (0x00007f7fa56be000)
	libxcb-xkb-9ba31ab3.so.1.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-xkb-9ba31ab3.so.1.0.0 (0x00007f7fa5497000)
	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f7fa546b000)
	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f7fa5456000)
	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f7fa5319000)
	libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007f7fa530e000)
	libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x00007f7fa52f0000)
	libxkbcommon-x11-c65ed502.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxkbcommon-x11-c65ed502.so.0.0.0 (0x00007f7fa50e3000)
	libxkbcommon-71ae2972.so.0.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxkbcommon-71ae2972.so.0.0.0 (0x00007f7fa4ea0000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7fa4e9a000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f7fa4cb9000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7fa4b6a000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f7fa4b4f000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7fa495d000)
	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f7fa4956000)
	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f7fa482d000)
	libbz2-a273e504.so.1.0.6 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libbz2-a273e504.so.1.0.6 (0x00007f7fa461c000)
	libpng15-c2ffaf3d.so.15.13.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libpng15-c2ffaf3d.so.15.13.0 (0x00007f7fa43ed000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f7fa887d000)
	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f7fa4335000)
	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f7fa42ff000)
	libxcb-util-4d666913.so.1.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libxcb-util-4d666913.so.1.0.0 (0x00007f7fa40f8000)
	libXau-00ec42fe.so.6.0.0 => /home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/../../../../opencv_python.libs/libXau-00ec42fe.so.6.0.0 (0x00007f7fa3ef3000)
	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f7fa3eed000)
	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f7fa3ee5000)
	libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f7fa3eda000)
	libbsd.so.0 => /usr/lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f7fa3ec0000)
	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f7fa3e4d000)

JonB

@Herald_Poro

loaded library "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
QObject::moveToThread: Current thread (0x34c51b0) is not the object's thread (0x5512280).
Cannot move to target thread (0x34c51b0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/<user>/.local/lib/python3.6/site-packages/cv2/qt/plugins" even though it was found.

This is identical to the other thread. Except that you're Python 3.6 and the other is 3.9, same behaviour.

I've put in a link from that thread to this one. I don't know what your answer is --- still hoping for an answer there --- but whatever it is seems like it is the same issue....

SGaist

Hi,

What exactly did you install ? And how did you install it ?

Herald_Poro

@SGaist said in PyQt5 and tensorflowlite causes crashes?:

Hi,

What exactly did you install ? And how did you install it ?

I've only installed PyQt5 using pip and qt designer using sudo apt-get install qttools5-dev-tools and sudo apt-get install qttools5-dev

SGaist

How did you install tensorflowlite ?