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  1. Qt
  2. QTBUG-95190

QRegularExpression::optimize() takes drastically longer in static release build

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Details

    • Bug
    • Resolution: Invalid
    • P2: Important
    • None
    • 5.14.2, 6.1.2, 6.3.0
    • Core: Other
    • Ubuntu 20.04 LTS
      clang 10.0.0

    Description

      1. Build the attached project with Qt which was configured with "-developer-build"
      2. Run the project passing in the attached input file:
        ./report input.txt
        

        It will return immediately.

      3. Build the attached project with Qt which was configured with "-static -release" instead.
        No sanitizers needed.
      4. Run the project passing in the attached input file:
        ./report input.txt
        

        It will take much longer until the program exits. For me it takes about six seconds. This is nearly thousand times longer.

      Google's oss-fuzz found this as issue 21711

      Attachments

        1. input.txt
          0.1 kB
        2. main.cpp
          0.2 kB
        3. report.pro
          0.0 kB
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          People

            thiago Thiago Macieira
            rlohning Robert Löhning
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            Dates

              Created:
              Updated:
              Resolved:

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