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invalid children order: A child is missing: bookmark:2325

See original GitHub issue

Describe the bug When syncing with Nextcloud, floccus fails with the message:

Nextcloud API error: {"status":"error","data":"invalid children order: A child is missing: bookmark:2325"}

Similar to https://github.com/marcelklehr/floccus/issues/705 . When this happens, Floccus consumes a lot of CPU.

To Reproduce

Sync

Expected behavior

Successful sync

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

OS: Ubuntu 18.04
Browser Chromium
Browser Version Version 89.0.4385.0 (Developer Build) Ubuntu 18.04 (64-bit)
Floccus version: 4.4.8 (released yesterday, but I think the problem pre-dates this)
Floccus sync method: nextcloud folders

Server (please complete the following information):

OS: Ubuntu 18.04
Nextcloud version: 20.0.3
Bookmarks app version: 4.0.6 (problem initially occurred I think on 4.0.4 before I updated to 4.0.6)

Note: Please write down the actual version numbers instead of writing ‘latest’.

Debug log It is often useful to provide a debug log file along with the issue. You can obtain a debug log of the most recent sync runs by clicking ‘Debug log’ in the bottom right corner of the floccus panel in your browser.

Note: As your debug log usually contains large parts of your bookmark data, instead of attaching it publicly to the issue here, I recommend uploading it privately at the following URL https://klehranlage.net/index.php/s/7nn82NSBsfQKdsJ

Debug log provided

Additional context

This didn’t fix the issue:

docker exec --user www-data nextcloud php occ maintenance:repair

output:

 - Deduplicate shared bookmark folders
     - Removed 0 duplicate shares
 - Remove superfluous shared bookmark folders
     - Removed 0 superfluous shares
 - Remove orphaned bookmark shares
     - Removed 0 orphaned shares
     - Removed 0 orphaned public links
 - Remove orphaned bookmark tree items
     - Removed 0 orphaned bookmarks entries
     - Removed 0 orphaned folders entries
     - Removed 0 orphaned children entries
     - Removed 0 orphaned bookmark folders
     - Removed 0 orphaned bookmarks
 - Update bookmark group shares
     - Removed 0 users and added 0 users to 0 groups
     - Removed 0 shares

A “sync from scratch” seems to temporarily fix this, but a couple syncs later the problem occurs again persistently.