Hangs on a breakpoint in debugging QGIS source (CentOS9 Stream)

Environment

• OS and version:
  CentOS Stream 9 , Kernel: Linux 5.14.0-559.el9.x86_64

• VS Code:

  Version: 1.97.2
  Commit: e54c774e0add60467559eb0d1e229c6452cf8447
  Date: 2025-02-12T23:20:35.343Z
  Electron: 32.2.7
  ElectronBuildId: 10982180
  Chromium: 128.0.6613.186
  Node.js: 20.18.1
  V8: 12.8.374.38-electron.0
  OS: Linux x64 5.14.0-559.el9.x86_64

• C/C++ extension:
  Version 1.22.11: November 5, 2024

• OS and version of remote machine (if applicable):

• GDB / LLDB version:
  GNU gdb (CentOS Stream) 14.2-4.el9

Bug Summary and Steps to Reproduce

Bug Summary:

we are building QGIS-final-3_38_1.

step1

sudo dnf install  cmake gdb gcc-c++

step2

sudo dnf  install  flex bison geos-devel gdal-devel proj-devel expat-devel libzip-devel sqlite-devel postgresql-devel spatialindex-devel libspatialite-devel exiv2-devel libzstd-devel PDAL-devel draco-devel protobuf-lite protobuf-devel protobuf-c-devel protobuf-lite-devel qt5-qtbase-devel qt5-qtserialport-devel qt5-qtsvg-devel qt5-qtlocation-devel qt5-qtwebkit-devel qt5-qt3d-devel qtkeychain-qt5-devel qca-qt5-devel qwt-qt5-devel gsl-devel python3-devel python3-sip-devel python3-qt5-devel qt5-qtmultimedia-devel qt5-qttools-static qscintilla-qt5-devel python3-qscintilla-qt5 python3-qscintilla-qt5-devel

step3
mkdir qgis-build-debug
cd qgis-build-debug
ccmake ../QGIS-final-3_38_1/

Press c
set CMAKE_BUILD_TYPE to Debug
Press c to reconfigure
Press g to configure then generate the makefiles.

Then do this (substituting the number after -j for the number of cores you wish to use to compile with.

make -j16

step4
install vscode 1.97.2 and C/C++ extension 1.22.11.
configure debugging environment with launch.json and tasks.json

step5
set breakpoint src/app/qgisapp.cpp:964
start debugging

Debugger Configurations

launch.json

{
    "version": "0.2.0",
    "configurations": [
      {
        "name": "Debug QGIS",
        "type": "cppdbg",
        "request": "launch",
        "program": "/home/zhefengjin/Downloads/qgis-build-debug/output/bin/qgis", // adjust to your executable path
        "args": [],
        "stopAtEntry": false,
        "cwd": "${workspaceFolder}",
        "environment": [],
        "externalConsole": false,
        "MIMode": "gdb",
        "miDebuggerPath": "/usr/bin/gdb", // adjust path to your debugger
        "preLaunchTask": "build"
      }
    ]
  }
  
tasks.json

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",  // Task name
            "type": "shell",
            "command": "cd ../qgis-build-debug/ && make -j16",  // Runs 'make' command
            "problemMatcher": [],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

Debugger Logs

=thread-group-added,id="i1"
GNU gdb (CentOS Stream) 14.2-4.el9
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Warning: Debuggee TargetArchitecture not detected, assuming x86_64.
=cmd-param-changed,param="pagination",value="off"

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.centos.org/>
Enable debuginfod for this session? (y or [n]) [answered N; input not from terminal]
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
Stopped due to shared library event (no libraries added or removed)
Loaded '/lib64/ld-linux-x86-64.so.2'. Symbols loaded.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
=library-unloaded,id="/usr/lib64/flexiblas//libflexiblas_openblas-openmp.so",target-name="/usr/lib64/flexiblas//libflexiblas_openblas-openmp.so",host-name="/usr/lib64/flexiblas//libflexiblas_openblas-openmp.so",thread-group="i1"

Breakpoint 1.1, main (argc=1, argv=0x7fffffffd9c8) at /home/zhefengjin/Downloads/QGIS-final-3_38_1/src/app/main.cpp:488
488	  QStringList preApplicationLogMessages;
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_app.so.3.38.1'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_gui.so.3.38.1'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_native.so.3.38.1'. Symbols loaded.
Loaded '/lib64/libqwt-qt5.so.6'. Symbols loaded.
Loaded '/lib64/libQt5Widgets.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Gui.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Core.so.5'. Symbols loaded.
Loaded '/lib64/libGL.so.1'. Symbols loaded.
Loaded '/lib64/libqscintilla2_qt5.so.15'. Symbols loaded.
Loaded '/lib64/libQt5QuickWidgets.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Quick.so.5'. Symbols loaded.
Loaded '/lib64/libQt5QmlModels.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Qml.so.5'. Symbols loaded.
Loaded '/lib64/libQt5MultimediaWidgets.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Multimedia.so.5'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_analysis.so.3.38.1'. Symbols loaded.
Loaded '/lib64/libgsl.so.25'. Symbols loaded.
Loaded '/lib64/libgslcblas.so.0'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgispython.so.3.38.1'. Symbols loaded.
Loaded '/lib64/libpython3.9.so.1.0'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_3d.so.3.38.1'. Symbols loaded.
Loaded '/home/zhefengjin/Downloads/qgis-build-debug/output/lib/libqgis_core.so.3.38.1'. Symbols loaded.
Loaded '/lib64/libQt5Sql.so.5'. Symbols loaded.
Loaded '/lib64/libQt5WebKitWidgets.so.5'. Symbols loaded.
Loaded '/lib64/libQt5WebKit.so.5'. Symbols loaded.
Loaded '/lib64/libOpenCL.so.1'. Symbols loaded.
Loaded '/lib64/libQt5Xml.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Svg.so.5'. Symbols loaded.
Loaded '/lib64/libQt5Concurrent.so.5'. Symbols loaded.
Loaded '/lib64/libqca-qt5.so.2'. Symbols loaded.
Loaded '/lib64/libgeos_c.so.1'. Symbols loaded.
Loaded '/lib64/libgdal.so.30'. Symbols loaded.
Loaded '/lib64/libspatialindex.so.6'. Symbols loaded.
Loaded '/lib64/libexpat.so.1'. Symbols loaded.
Loaded '/lib64/libsqlite3.so.0'. Symbols loaded.
Loaded '/lib64/libzip.so.5'. Symbols loaded.
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Loaded '/lib64/libexiv2.so.27'. Symbols loaded.
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Loaded '/lib64/libqt5keychain.so.1'. Symbols loaded.
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Loaded '/usr/lib64/flexiblas//libflexiblas_netlib.so'. Symbols loaded.
Loaded '/usr/lib64/flexiblas//libflexiblas_fallback_lapack.so'. Symbols loaded.
Loaded '/usr/lib64/flexiblas//libflexiblas_openblas-openmp.so'. Symbols loaded.
[New Thread 0x7fffac0d7640 (LWP 30133)]
[New Thread 0x7fffab8d6640 (LWP 30134)]
[New Thread 0x7fffaa0b4640 (LWP 30135)]
[New Thread 0x7fffa98b3640 (LWP 30136)]
[New Thread 0x7fffa9001640 (LWP 30141)]
[Thread 0x7fffa9001640 (LWP 30141) exited]
=library-unloaded,id="/usr/lib64/libvulkan_radeon.so",target-name="/usr/lib64/libvulkan_radeon.so",host-name="/usr/lib64/libvulkan_radeon.so",thread-group="i1"
=library-unloaded,id="/usr/lib64/libvulkan_intel.so",target-name="/usr/lib64/libvulkan_intel.so",host-name="/usr/lib64/libvulkan_intel.so",thread-group="i1"
=library-unloaded,id="/usr/lib64/libvulkan_intel_hasvk.so",target-name="/usr/lib64/libvulkan_intel_hasvk.so",host-name="/usr/lib64/libvulkan_intel_hasvk.so",thread-group="i1"
=library-unloaded,id="/lib64/libVkLayer_MESA_device_select.so",target-name="/lib64/libVkLayer_MESA_device_select.so",host-name="/lib64/libVkLayer_MESA_device_select.so",thread-group="i1"
=library-unloaded,id="/usr/lib64/libvulkan_lvp.so",target-name="/usr/lib64/libvulkan_lvp.so",host-name="/usr/lib64/libvulkan_lvp.so",thread-group="i1"
=library-unloaded,id="/lib64/libvulkan.so.1",target-name="/lib64/libvulkan.so.1",host-name="/lib64/libvulkan.so.1",thread-group="i1"
[New Thread 0x7fffa9001640 (LWP 30151)]
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Thread 1 "qgis" hit Breakpoint 2, QgisApp::QgisApp (this=0x264a1a0, splash=0x27616d0, restorePlugins=true, skipBadLayers=false, skipVersionCheck=false, rootProfileLocation=..., activeProfile=..., parent=0x0, fl=...) at /home/zhefengjin/Downloads/QGIS-final-3_38_1/src/app/qgisapp.cpp:964
964	  if ( sInstance )
Loaded '/usr/lib64/qt5/plugins/platforms/libqxcb.so'. Symbols loaded.
Loaded '/lib64/libQt5XcbQpa.so.5'. Symbols loaded.
Loaded '/lib64/libX11-xcb.so.1'. Symbols loaded.
Loaded '/lib64/libxcb-icccm.so.4'. Symbols loaded.
Loaded '/lib64/libxcb-image.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-shm.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-keysyms.so.1'. Symbols loaded.
Loaded '/lib64/libxcb-randr.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-render-util.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-render.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-shape.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-sync.so.1'. Symbols loaded.
Loaded '/lib64/libxcb-xfixes.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-xinerama.so.0'. Symbols loaded.
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Loaded '/lib64/libxcb-xinput.so.0'. Symbols loaded.
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Loaded '/lib64/libxkbcommon.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-util.so.1'. Symbols loaded.
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Loaded '/lib64/libpixman-1.so.0'. Symbols loaded.
Loaded '/lib64/libatspi.so.0'. Symbols loaded.
Loaded '/lib64/libstemmer.so.0'. Symbols loaded.
Loaded '/lib64/libjson-glib-1.0.so.0'. Symbols loaded.
Loaded '/lib64/libdatrie.so.1'. Symbols loaded.
Loaded '/usr/lib64/gio/modules/libgvfsdbus.so'. Symbols loaded.
Loaded '/usr/lib64/gvfs/libgvfscommon.so'. Symbols loaded.
Loaded '/usr/lib64/gtk-3.0/modules/libcanberra-gtk-module.so'. Symbols loaded.
Loaded '/lib64/libcanberra-gtk3.so.0'. Symbols loaded.
Loaded '/lib64/libgthread-2.0.so.0'. Symbols loaded.
Loaded '/lib64/libcanberra.so.0'. Symbols loaded.
Loaded '/lib64/libvorbisfile.so.3'. Symbols loaded.
Loaded '/lib64/libtdb.so.1'. Symbols loaded.
Loaded '/usr/lib64/gtk-3.0/modules/libpk-gtk-module.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so'. Symbols loaded.
Loaded '/lib64/libxcb-glx.so.0'. Symbols loaded.
Loaded '/lib64/libGLX_mesa.so.0'. Symbols loaded.
Loaded '/lib64/libglapi.so.0'. Symbols loaded.
Loaded '/lib64/libgallium-24.2.8.so'. Symbols loaded.
Loaded '/lib64/libdrm.so.2'. Symbols loaded.
Loaded '/lib64/libxcb-dri2.so.0'. Symbols loaded.
Loaded '/lib64/libXxf86vm.so.1'. Symbols loaded.
Loaded '/lib64/libxshmfence.so.1'. Symbols loaded.
Loaded '/lib64/libxcb-dri3.so.0'. Symbols loaded.
Loaded '/lib64/libxcb-present.so.0'. Symbols loaded.
Loaded '/lib64/libLLVM.so.19.1'. Symbols loaded.
Loaded '/lib64/libdrm_radeon.so.1'. Symbols loaded.
Loaded '/lib64/libdrm_amdgpu.so.1'. Symbols loaded.
Loaded '/lib64/libelf.so.1'. Symbols loaded.
Loaded '/lib64/libedit.so.0'. Symbols loaded.
Loaded '/lib64/libtinfo.so.6'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/iconengines/libqsvgicon.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqgif.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqicns.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqico.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqjp2.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqjpeg.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqmng.so'. Symbols loaded.
Loaded '/lib64/libmng.so.2'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqpdf.so'. Symbols loaded.
Loaded '/lib64/libQt5Pdf.so.5'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqsvg.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqtga.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqtiff.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqwbmp.so'. Symbols loaded.
Loaded '/usr/lib64/qt5/plugins/imageformats/libqwebp.so'. Symbols loaded.
Loaded '/lib64/libwebpmux.so.3'. Symbols loaded.
Loaded '/lib64/libwebpdemux.so.2'. Symbols loaded.
Execute debugger commands using "-exec <command>", for example "-exec info registers" will list registers in use (when GDB is the debugger)

Other Extensions

Not.
tested with only this.

Additional Information

No response

Inizia con le configurazioni launch.json e tasks.json e riproduci il breakpoint in src/app/qgisapp.cpp:964 utilizzando l’ambiente CentOS Stream 9 e il log di GDB forniti. Confronta l’arresto in src/app/main.cpp:488 con il blocco segnalato e identifica se l’estensione C/C++ rimane reattiva dopo il breakpoint; il lavoro è completato quando la causa è isolata e il debugging non si blocca più.