PySide6 6.4.1 app periodically hangs straight after launch on macOS Ventura 13.0.1

Description of the issue

My PySide6-based app will periodically hang straight after launch on macOS Ventura 13.0.1. It doesn't happen every time - probably 1 in 10 or so launches hang. When I run the code unfrozen, it never hangs. I've reproduced the bug using a really minimal example below: just displaying a single message dialog.

Context information (for bug reports)

• Output of pyinstaller --version: 5.7.0

• Version of Python: Python 3.10.9 (v3.10.9:1dd9be6584, Dec 6 2022, 14:37:36) [Clang 13.0.0 (clang-1300.0.29.30)]

• Platform: macOS Ventura 13.0.1

• How you installed Python: From python.org (macOS 64-bit universal2 installer)

• Did you also try this on another platform? Does it work there? Haven't tried yet.

• try the latest development version: Tried latest devel version - hangs still occur.

  • start with clean installation
  • use the latest development version
  • Run your frozen program from a command window (shell) — instead of double-clicking on it

When I run the frozen app from the command line (./dist/HangTest.app/Contents/MacOS/HangTest) it never seems to hang. The hang only occurs when launched from the Finder.

• Package your program in --onedir mode
• Package without UPX, say: use the option --noupx or set upx=False in your .spec-file
• Repackage you application in verbose/debug mode. For this, pass the option --debug to pyi-makespec or pyinstaller or use EXE(..., debug=1, ...) in your .spec file.

A minimal example program which shows the error

hang_test.py

from PySide6 import QtCore, QtWidgets
from PySide6.QtCore import Qt


def main():
    app = QtWidgets.QApplication()
    QtWidgets.QMessageBox.information(None, "Test", "Hello World!")


if __name__ == "__main__":
    main()

hang_test.spec

# -*- mode: python ; coding: utf-8 -*-


#
# Set various parameters
#
app_version = "0.1.0"
onefile = False
block_cipher = None


#
# Main spec file elements
#
a = Analysis(['hang_test.py'],
        binaries=[],
        datas=[],
        hiddenimports=[],
        hookspath=[],
        runtime_hooks=[],
        excludes=[],
        win_no_prefer_redirects=False,
        win_private_assemblies=False,
        cipher=block_cipher,
        noarchive=False
    )

pyz = PYZ(a.pure, a.zipped_data,
            cipher=block_cipher)

exe = EXE(pyz,
        a.scripts,
        a.binaries if onefile else [],
        a.zipfiles if onefile else [],
        a.datas if onefile else [],
        exclude_binaries=not onefile,
        name='HangTest',
        debug=True,
        bootloader_ignore_signals=False,
        strip=False,
        upx=False,
        upx_exclude=[],
        runtime_tmpdir=None,
        console=False,
        disable_windowed_traceback=False,
        argv_emulation=True,
        target_arch='universal2',
        codesign_identity=None,
        entitlements_file=None,
    )
bundle_obj = exe

if not onefile:
    coll = COLLECT(
            exe,
            a.binaries,
            a.zipfiles,
            a.datas,
            strip=False,
            upx=True,
            upx_exclude=[],
            name='HangTest',
        )
    bundle_obj = coll

app = BUNDLE(bundle_obj,
        name='HangTest.app',
        bundle_identifier="app.hangtest",
        info_plist={
            'CFBundleShortVersionString': app_version,
        }
    )

Stacktrace / full error message

Diagnostic Report with stacktrace attached: HangTest_2022-12-27-225244.hang.txt

Start with the minimal reproduction in hang_test.py and its hang_test.spec, then launch the generated HangTest.app from Finder on macOS Ventura rather than from the shell. Read the attached HangTest_2022-12-27-225244.hang.txt diagnostic report and compare Finder launches with command-line launches; done means the intermittent post-launch hang is explained and no longer reproducible in this setup.