LMMS freezes after export progress reaches 100%
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- Dominant language
- C++
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Description
### System Information
CachyOS + ALHP x86_64-v3 + Arch Linux / SwayWM / pipewire-jack / CPU: Core i7-4770S / RAM: 32GB
### LMMS Version(s)
LMMS 1.2.2 (Linux x86_64, Qt 5.15.17, GCC 15.1.1 20250425)
### Most Recent Working Version
_No response_
### Bug Summary
Freezes when exporting (wav/mp3/ogg) progress reaches 100%. (CPU usage is not high)
related? #5919
### Expected Behaviour
The export completes successfully and I can use LMMS after export job.
### Steps To Reproduce
1. Open LMMS
2. Create a note to any track
3. File -> Export
4. wait progress
5. LMMS freezes
### Logs
```
$ lmms
*** WEAK-JACK: initializing
*** WEAK-JACK: OK. (0)
Notice: could not set realtime priority.
QMetaMethod::invoke: Unable to handle unregistered datatype 'MidiTime'
^C
```
### Screenshots / Minimum Reproducible Project
### Please search the issue tracker for existing bug reports before submitting your own.
- [x] I have searched all existing issues and confirmed that this is not a duplicate.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the export freeze in LMMS 1.2.2 using the listed steps and compare the behavior with related issue #5919. Trace the export workflow from File -> Export and use the provided launch output to identify where the application stops responding; done means WAV, MP3, and OGG exports complete and LMMS remains usable.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- linux
- Domain
- audio-video-rtc, desktop
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100