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  1. Qt
  2. QTBUG-111964

QProcess::start does not return if setChildModifier hangs

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Details

    • Bug
    • Resolution: Fixed
    • P2: Important
    • 6.5.2, 6.6.0
    • 6.4.0 FF
    • Core: I/O
    • None
    • Linux/X11
    • 29b2fe40d (dev), 65528387d (6.5), c5221f6be (dev)

    Description

      Previously in Qt 6.2.x it was possible to call "kill(getpid(), SIGSTOP);" inside the setChildProcessModifier callback. 

      This is necessary to start an app suspended, e.g. to later attach a debugger to it.

      With 6.4.x ( my guess would be with https://codereview.qt-project.org/c/qt/qtbase/+/417829 ) this hangs in QProcess::start.

      FYI: On macOS it still works, its just linux having an issue.

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-111243 [REG: 5->6] pthread functions seem to refer to the parent process in QProcess child setup

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-104493 Application performance drops if many threads are running while QProcess creates sub-processes on Unix

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              thiago Thiago Macieira
              madwinter Marcus Tillmanns
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              Dates

                Created:
                Updated:
                Resolved:

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