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Type: Bug
Resolution: Fixed
Priority: Major
Fix Version/s: 4.4.7, 4.5.3
Affects Version/s: 4.4, 4.5
Component/s: Assignment
Labels:
- partner
- partner-Praxis
- patch
- praxis
- release_notes

Affected Branches:
MOODLE_404_STABLE, MOODLE_405_STABLE
Fixed Branches:
MOODLE_404_STABLE, MOODLE_405_STABLE
Pull from Repository:
https://github.com/praxisdigital/moodle
Pull 4.4 Branch:
~~MDL-82440~~-MOODLE_404_STABLE
Pull 4.4 Diff URL:
https://github.com/moodle/moodle/compare/02e8cebdd2b29847a1bfc20321b5494255046647...praxisdigital:moodle:MDL-82440-MOODLE_404_STABLE
Pull 4.5 Branch:
~~MDL-82440~~-MOODLE_405_STABLE
Pull 4.5 Diff URL:
https://github.com/moodle/moodle/compare/4bd3217ce86812b9b704f855cee4534cac66d456...praxisdigital:moodle:MDL-82440-MOODLE_405_STABLE
Pull Main Branch:
~~MDL-82440~~-main
Pull Main Diff URL:
https://github.com/moodle/moodle/compare/0888a6d324e960ff2d572b3fe371c362bf907536...praxisdigital:moodle:MDL-82440-main
Testing Instructions:
Hide

Install/upgrade Ghostscript to >= 10.03.1

Create an assignment module in a course with assignfeedback_editpdf

As a student submit the attached file "download (1)-1.pdf"

Login as teacher and press Grade.

Verify that the grader "generates" a page with a chef
Show
Install/upgrade Ghostscript to >= 10.03.1 Create an assignment module in a course with assignfeedback_editpdf As a student submit the attached file "download (1)-1.pdf" Login as teacher and press Grade. Verify that the grader "generates" a page with a chef
Pre-check results:
Hide

Code verified against automated checks.

Checked ~~MDL-82440~~ using repository: https://github.com/praxisdigital/moodle

MOODLE_404_STABLE (0 errors / 0 warnings) [branch: MDL-82440-MOODLE_404_STABLE | CI Job]

MOODLE_405_STABLE (0 errors / 0 warnings) [branch: MDL-82440-MOODLE_405_STABLE | CI Job]

main (0 errors / 0 warnings) [branch: MDL-82440-main | CI Job]

_{More information about this report}

Built on: Tue 10 Dec 2024 07:28:28 AM UTC
Show
Code verified against automated checks. Checked MDL-82440 using repository: https://github.com/praxisdigital/moodle MOODLE_404_STABLE (0 errors / 0 warnings) [branch: MDL-82440-MOODLE_404_STABLE | CI Job ] MOODLE_405_STABLE (0 errors / 0 warnings) [branch: MDL-82440-MOODLE_405_STABLE | CI Job ] main (0 errors / 0 warnings) [branch: MDL-82440-main | CI Job ] More information about this report Built on: Tue 10 Dec 2024 07:28:28 AM UTC
Automated test results:
Hide

Launching automatic jobs for branch ~~MDL-82440~~-MOODLE_404_STABLE

https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18086/ PHPUnit (sqlsrv)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61801/ Behat (NonJS - boost and classic)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61802/ Behat (Firefox - boost)

Launching automatic jobs for branch ~~MDL-82440~~-MOODLE_405_STABLE

https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18087/ PHPUnit (sqlsrv)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61803/ Behat (NonJS - boost and classic)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61804/ Behat (Firefox - boost)

Launching automatic jobs for branch ~~MDL-82440~~-main

https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18088/ PHPUnit (sqlsrv)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61805/ Behat (NonJS - boost and classic)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61806/ Behat (Firefox - boost)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61807/ Behat (Firefox - classic)

https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61808/ App tests (stable app version) --> unrelated app failures

Built on: Tue Jan 28 08:30:23 AM UTC 2025
Show
Launching automatic jobs for branch MDL-82440 -MOODLE_404_STABLE https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18086/ PHPUnit (sqlsrv) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61801/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61802/ Behat (Firefox - boost) Launching automatic jobs for branch MDL-82440 -MOODLE_405_STABLE https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18087/ PHPUnit (sqlsrv) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61803/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61804/ Behat (Firefox - boost) Launching automatic jobs for branch MDL-82440 -main https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/18088/ PHPUnit (sqlsrv) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61805/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61806/ Behat (Firefox - boost) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61807/ Behat (Firefox - classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/61808/ App tests (stable app version) --> unrelated app failures Built on: Tue Jan 28 08:30:23 AM UTC 2025

When testing on a higher version of Ghostscript (10.03.1), we discovered that the assignment preview and grading in Moodle is broken and renders a white blank screen instead of the expected document.

Diving a bit deeper, we discovered that ghostscript by default, processes the file with default PDF compatibility set to 1.7, which the free parser shipped with FPDI does not support.

The error message generated is as follows:

Exception - This PDF document probably uses a compression technique which is not supported by the free parser shipped with FPDI. (See https://www.setasign.com/fpdi-pdf-parser for more details) Debug:

Error code: generalexceptionmessage

* line 257 of /mod/assign/feedback/editpdf/fpdi/PdfParser/CrossReference/CrossReference.php: setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException thrown

* line 209 of /mod/assign/feedback/editpdf/fpdi/PdfParser/CrossReference/CrossReference.php: call to setasign\Fpdi\PdfParser\CrossReference\CrossReference->initReaderInstance()

* line 67 of /mod/assign/feedback/editpdf/fpdi/PdfParser/CrossReference/CrossReference.php: call to setasign\Fpdi\PdfParser\CrossReference\CrossReference->readXref()

* line 157 of /mod/assign/feedback/editpdf/fpdi/PdfParser/PdfParser.php: call to setasign\Fpdi\PdfParser\CrossReference\CrossReference->__construct()

* line 205 of /mod/assign/feedback/editpdf/fpdi/PdfParser/PdfParser.php

We also discovered that if we were to force the ghostscript compatibility to something like 1.4, it would create a file compatible for the other library to read (e.g. using the flag -dCompatibilityLevel=1.4)

Whilst this flag can be used for now, it is not a long term solution.

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download (1)-1.pdf
54 kB
10/Dec/24 3:20 PM
MDL-82440.png
1.02 MB
12/Feb/25 10:47 AM

has a non-specific relationship to

MDL-84730 Ghostscript 100% cpu while displaying a pdf in Moodle 4.5.2

Open

Assignee:: Frederik Milling Pytlick

Reporter:: Kevin Pham

Peer reviewer:: Gilles-Philippe Leblanc

Integrator:: Glyn (Mathew) May

Tester:: Ron Carl Alfon Yu

Participants:: bwurst, CiBoT, Frederik Milling Pytlick, Gilles-Philippe Leblanc, Glyn (Mathew) May, Huong Nguyen, Jonathon Fowler, Kevin Pham, Miroslav Jarý, Niels Gandraß, Ron Carl Alfon Yu, Tue Korsgaard

Votes:: 8 Vote for this issue

Watchers:: 14 Start watching this issue

Created:: 11/Jul/24 9:21 AM

Updated:: 02/Apr/25 12:07 AM

Resolved:: 14/Feb/25 11:11 AM

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5h 20m

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