Closing the QML window leaves the Julia process running in latest version(v0.13.0)

Closing the QML window leaves the Julia process running instead of exiting cleanly.
This happens in latest version only, v0.12.1 works fine.

Steps to reproduce:

Create minimal helloworld project in qml

// helloworld.qml

import QtQuick
import QtQuick.Window

Window {
    visible: true
    width: 400
    height: 300
    title: "Hello World"

    Text {
        anchors.centerIn: parent
        text: "Hello, World!"
        font.pointSize: 20
    }
}

# main.jl

using QML

qml_file = joinpath(dirname(@__FILE__), "helloworld.qml")
loadqml(qml_file)

exec()

Run the file julia --project=. main.jl
Close hello world application window.

Additional information:

Video to demonstrating issue

qml_test.mp4

Thanks for reporting this. It is Windows specific and I couldn't immediately find the cause, this will take some debugging on my Windows machine.

Closing default dialog window (to browse for path) on Windows 11 (QML 0.13) also causes issue (few seconds lag and then app resumes normally, but Windows crash report gets generated). Appears to be related. Works as expected on Linux. No issues on 0.12.1.

Crash report.

Faulting application name: julia.exe, version: 1.12.6.0, time stamp: 0x69d80f52
Faulting module name: Qt6Core.dll, version: 6.10.2.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x000000000025648c
Faulting process id: 0x644
Faulting application start time: 0x1DCD046872B5243
Faulting application path: C:\Users\karlo\.julia\juliaup\julia-1.12.6+0.x64.w64.mingw32\bin\julia.exe
Faulting module path: C:\Users\karlo\.julia\artifacts\00509438191d3ba063ec20fd2ebf58cbe32f2390\bin\Qt6Core.dll
Report Id: 140958f4-4f92-465f-83b4-732a7edb6f61
Faulting package full name: 
Faulting package-relative application ID:

In the mean time I found out that this is caused by the change to Qt 6.10, since building the current jlqml with Qt 6.8 works. Also building a local jlqml with MSVC against Qt 6.10 works.

I finally managed to get a backtrace of this:

Qt6Core.dll!destroy_current_thread_data(void * p) (\workspace\srcdir\qtbase-everywhere-src-6.10.2\src\corelib\thread\qthread_win.cpp:54)
Qt6Core.dll!Cleanup::~Cleanup(Cleanup * const this) (\workspace\srcdir\qtbase-everywhere-src-6.10.2\src\corelib\thread\qthread_win.cpp:89)
libstdc++-6.dll!(anonymous namespace)::run(void * p) (\workspace\srcdir\gcc-14.2.0\libstdc++-v3\libsupc++\atexit_thread.cc:98)
libwinpthread-1.dll!_pthread_cleanup_dest(pthread_t t) (\workspace\srcdir\mingw-w64-v11.0.1\mingw-w64-libraries\winpthreads\src\thread.c:973)
libwinpthread-1.dll!_pthread_cleanup_dest(pthread_t t) (\workspace\srcdir\mingw-w64-v11.0.1\mingw-w64-libraries\winpthreads\src\thread.c:949)
libwinpthread-1.dll!__dyn_tls_pthread(HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved) (\workspace\srcdir\mingw-w64-v11.0.1\mingw-w64-libraries\winpthreads\src\thread.c:456)
libwinpthread-1.dll!__dyn_tls_pthread(HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved) (\workspace\srcdir\mingw-w64-v11.0.1\mingw-w64-libraries\winpthreads\src\thread.c:427)
ntdll.dll!ntdll!RtlTimeToSecondsSince1970 (Unknown Source:0)
ntdll.dll!ntdll!RtlEncodeRemotePointer (Unknown Source:0)
ntdll.dll!ntdll!RtlRaiseException (Unknown Source:0)
ntdll.dll!ntdll!RtlRaiseException (Unknown Source:0)
ntdll.dll!ntdll!LdrShutdownThread (Unknown Source:0)
ntdll.dll!ntdll!RtlExitUserThread (Unknown Source:0)
kernel32.dll!KERNEL32!BaseThreadInitThunk (Unknown Source:0)
ntdll.dll!ntdll!RtlUserThreadStart (Unknown Source:0)
[Unknown/Just-In-Time compiled code] (Unknown Source:0)

This is almost certainly a bug in Qt, or at least a buggy interaction between Qt and MinGW and it was introduced in Qt 6.9:

https://qt-project.atlassian.net/browse/QTBUG-131892#icft=QTBUG-131892

[Qt6Base] Fix mingw hang on exit (#13693)

Should be fixed by updating Qt6Base_jll.

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Closing the QML window leaves the Julia process running in latest version(v0.13.0) #237

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Closing the QML window leaves the Julia process running in latest version(v0.13.0) #237

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barche commented on Apr 16, 2026

KSepetanc commented on Apr 19, 2026

barche commented on Apr 25, 2026

barche commented on May 2, 2026

barche commented on May 11, 2026

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