Mixxx 2.5.0 freezes when changing library folder

[yanus]

Bug Description

Since upgrading to 2.5.0, the UI freezes indefinitely everytime I click any of the folders in the library sidebar.
The track keeps playing and the controller still works (although I don't seem to be able to control the EQ knobs anymore).
The only option is to force quit Mixxx.
The log doesn't seem to be useful, since all entries are from before the freeze and there isn't anything out of the ordinary even before that.
Let me know if there's anything I should try or additional information I could collect!

Version

2.5.0

OS

Windows 11

[ronso0]

What do you mean with "folders"?
Any sidebar item, or literally disk folders in the Computer feature?

[ronso0]

You might see more debug messages when you start Mixxx from the command line with --log-level trace.
https://manual.mixxx.org/latest/en/chapters/appendix/commandline_dev_tools.html

If that indeed reveals more, please try to catch the output just after you clicked an item and paste it here, preferably wrapped in triple backticks, or just click the 'code' format button < > in the message toolbar.

[yanus]

What do you mean with "folders"? Any sidebar item, or literally disk folders in the Computer feature?

It's any item in the sidebar, even clicking the "Tracks" that's already selected when starting Mixxx causes the issue. However, expanding items by clicking on the small triangles works fine.

You might see more debug messages when you start Mixxx from the command line with --log-level trace.

Thanks, I've tried the command line flag and also unloaded all decks and samplers to cut down on the amount of messages, but there is nothing special when I click an item, only a stream of messages like this:

15:23:04.709 Debug [Engine] EngineSync - EngineSync::notifyInstantaneousBpmChanged "[InternalClock]" Bpm(123.93)
15:23:04.709 Debug [Engine] EngineSync - EngineSync::notifyBeatDistanceChanged "[InternalClock]" 0.958198
15:23:04.709 Debug [Engine] EngineSync - EngineSync::updateLeaderBeatDistance "[InternalClock]" 0.958198

[ronso0]

Thanks!

If you're okay with testing a debug build, I'd set up a branch with additional logging?

[ronso0]

Btw Qt version is used?
You'll find that in the About dialog.

Btw what happens if you start Mixxx and don't click, but Tab to sidebar and use the Down key to navigate?

[ronso0]

The PR is #14307 and infos for testing are here
https://github.com/mixxxdj/mixxx/wiki/Testing
And make a backup of your data, just in case
https://github.com/mixxxdj/mixxx/wiki/Testing#backup-settings-and-database

[yanus]

Btw Qt version is used? You'll find that in the About dialog.

Qt version: 6.5.3

Btw what happens if you start Mixxx and don't click, but Tab to sidebar and use the Down key to navigate?

It appears that any keypress (even Ctrl key) while the sidebar is focused also triggers the issue.

[yanus]

The PR is #14307 and infos for testing are here https://github.com/mixxxdj/mixxx/wiki/Testing And make a backup of your data, just in case https://github.com/mixxxdj/mixxx/wiki/Testing#backup-settings-and-database

Alright, I've tried the test build, and most of the time I don't see the debug message, so maybe something breaks earlier. But here is one I've caught:

17:31:49.992 Warning [Main] SidebarModel::clicked QModelIndex(0,0,0x2054cc973b0,SidebarModel(0x2054cc973b0))
17:31:49.992 Warning [Main]   index valid
17:31:49.992 Warning [Main]   index is root of "Tracks" -> activate()
17:31:49.992 Debug [Main] MixxxLibraryFeature::activate()
17:31:49.992 Debug [Main] WTrackTableView::loadTrackModel() LibraryTableModel(0x20535f19180)
17:31:49.997 Debug [Main] LibraryTableModel(0x20535f19180) select() returned 0 results in 0 ms

[ronso0]

Great, thanks!

But after that the UI would still freeze?

It appears that any keypress (even Ctrl key) while the sidebar is focused also triggers the issue.

That sound severe.. no idea how to procede

[ronso0]

Do you have any external libraries enabled, eg. Traktor or iTunes?
If yes, does it make a difference if you disable all and restart?

[yanus]

But after that the UI would still freeze?

Yes, unfortunately.

Do you have any external libraries enabled, eg. Traktor or iTunes?

No external libraries enabled.

I did some more testing, and things are even weirder... if I set the number of samplers to 4 or 8 (instead of 16) and then restart Mixxx, things are fine. If I close a certain background app (DeepL translator) before starting Mixxx, it's fine as well. I'm starting to think my laptop is cursed...
In any case, thank you for the assistance so far trying to figure this out! I'll see if I can make sense of it some more and let you know if I get any additional insights.

[ronso0]

Puuh, sounds fun.. not 😓

I have no clue how all this relates. Number of samplers is entirely unrelated to signals in the library.