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  1. Moodle
  2. MDL-35547

Inifinite loop if question category points to itself as a parent

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Details

    • Bug
    • Resolution: Fixed
    • Minor
    • 2.2.6, 2.3.3
    • 2.2.5, 2.3, 2.4
    • Questions
    • MOODLE_22_STABLE, MOODLE_23_STABLE, MOODLE_24_STABLE
    • MOODLE_22_STABLE, MOODLE_23_STABLE
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      1. Create several question categories and sub-categories in a course (the more the better).
      2. Confirm all categories are displayed OK in a drop-down on question/edit.php?courseid=N page.
      3. Edit database by hand to create a loop: in table mdl_question_categories find a top-level (with parent=0) category from your course and change parent to the id of one of the children.
      4. Confirm that an exception is thrown, instead of infinite loop and timeout (previous behaviour)
      5 Repeat 3 & 4 but change mdl_question_categories.parent to ID of one of the grand-children and finally to the id of the top-level category itself.

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      1. Create several question categories and sub-categories in a course (the more the better). 2. Confirm all categories are displayed OK in a drop-down on question/edit.php?courseid=N page. 3. Edit database by hand to create a loop: in table mdl_question_categories find a top-level (with parent=0) category from your course and change parent to the id of one of the children. 4. Confirm that an exception is thrown, instead of infinite loop and timeout (previous behaviour) 5 Repeat 3 & 4 but change mdl_question_categories.parent to ID of one of the grand-children and finally to the id of the top-level category itself.

    Description

      After an upgrade, we have got some question categories to point to themselves as a parent. That is mdl_question_categories.id == mdl_question_categories.parent.
      This is causing question_categorylist() function to go into infinite loop, until all the resources available (memory) is used up.

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              tmuras Tomasz Muras
              tmuras Tomasz Muras
              Tim Hunt Tim Hunt
              Sam Hemelryk Sam Hemelryk
              David Monllaó David Monllaó
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                Updated:
                Resolved:

                Clockify

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