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  1. Qt for Python
  2. PYSIDE-1681

GIL deadlock in qInstallMessageHandler

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • None
    • 5.14.2, 5.15.2, 6.2.0
    • PySide
    • None
    • All
    • b8dadf54c3736b52a770d7715c8320a4dd016427 (pyside/pyside-setup/dev) b2b0206844779702320c499f46277c56765a0a9e (pyside/pyside-setup/6.2) 0a2cac41f776e225d617598fd55a942bef913573 (pyside/tqtc-pyside-setup/5.15)

    Description

      The combination of qInstallMessageHandler, QQmlApplicationEngine loading an 
      ApplicationWindow and Qt Logging enabled (e.g. with QT_LOGGING_RULES=*=true) results in a GIL deadlock in qt_message_output.
       
      When starting the attached application with Qt Logging enabled, the process hangs and the window is not shown. In the thread stack list, you can see that the Qt Thread hangs at PyGILState_Ensure. 
       
      This is very likely a regression from https://bugreports.qt.io/browse/PYSIDE-803, as the issue can't be reproduced with 5.13.2 (5.14.0 and 5.14.1 crashes).

      Attachments

        1. pyside1681_stack.txt
          42 kB
        2. pyside1681.zip
          1 kB
        3. test.py
          0.4 kB
        4. test6.py
          0.4 kB
        5. view.qml
          0.3 kB

        Issue Links

          resulted from

          Bug - A problem which impairs or prevents the functions of the product. PYSIDE-803 QThread Freezes GUI

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              kleint Friedemann Kleint
              schlamar schlamar
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              Dates

                Created:
                Updated:
                Resolved:

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