PrairieLearn Corrupt base64 representation of submitted file

I have a file-upload question that asks for a JPG file with this code: <pl-file-upload file-names="loop.jpg"></pl-file-upload>

One submission is automatically reporting the following issue:

Issue User: *** (***) Student message: Error rendering question Instructor message: CourseIssueError: /srv/sysconf/ca/main/revisions/5b9cfd541d12866228f52f20ab1bdcfc93a76ef7/elements/pl-file-preview/pl-file-preview.py: Error calling render(): Error: CodeCallerNative child process exited unexpectedly, code = 1, signal = null ID: 46044 Date: 2022-09-21 16:56:32-07 (PDT)

I've managed to download the submitted "loop.jpg" and it turns out to be a zero-byte file. Should the renderer catch this special case? Or have I missed something obvious?

Thanks, Rik

Sep 30 '22 06:09 rikblok

pl-file-upload typically rejects 0-byte files, so this is not actually the problem. I checked the question (since I'm still tagged as staff for the course 😄 ) and it seems there was some sort of corruption in the submission data, with the file data having an invalid base64 representation of the data. @nwalters512 @mwest1066 this probably needs to be reviewed in the database itself (question instance 30677765, variant ID 6624592).

Sep 30 '22 13:09 jonatanschroeder

I haven't heard any repeat of this problem, so I'll close it as resolved, but if it's found again please feel free to reopen with more details.

Sep 28 '23 19:09 jonatanschroeder