Segmentation fault when just playing a song

[michaelgregorius]

Bug Summary

I got a segmentation fault from just playing a song (with a debug build). The song was "Greippi - Krem Kaakkuja (Second Flight Remix).mmpz" and the crash seems to have happened around the 108th beat. Please also refer to the attached screenshot for times, etc.

Steps to reproduce

This cannot be reproduced deterministically but I was able to reproduce it several times by setting a loop point as follows and then let it play in that loop until the segmentation fault occurs:

No actions were taken at the time of the crash.

Expected behavior

No crash. 😉

Actual behavior

Crash.

Screenshot

Here's how the screen looked during the crash:

Affected LMMS versions

master at commit c2f2b7e.

Stack trace

Stack trace

lmms::InstrumentTrack::processAudioBuffer(lmms::InstrumentTrack * const this, lmms::sampleFrame * buf, const lmms::fpp_t frames, lmms::NotePlayHandle * n) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/tracks/InstrumentTrack.cpp:236)
lmms::InstrumentPlayHandle::play(lmms::InstrumentPlayHandle * const this, lmms::sampleFrame * working_buffer) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/InstrumentPlayHandle.cpp:71)
lmms::PlayHandle::doProcessing(lmms::PlayHandle * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/PlayHandle.cpp:59)
lmms::ThreadableJob::process(lmms::ThreadableJob * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/include/ThreadableJob.h:77)
lmms::AudioEngineWorkerThread::JobQueue::run(lmms::AudioEngineWorkerThread::JobQueue * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/AudioEngineWorkerThread.cpp:88)
lmms::AudioEngineWorkerThread::startAndWaitForJobs() (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/AudioEngineWorkerThread.cpp:161)
lmms::AudioEngine::renderStageInstruments(lmms::AudioEngine * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/AudioEngine.cpp:387)
lmms::AudioEngine::renderNextBuffer(lmms::AudioEngine * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/AudioEngine.cpp:454)
lmms::AudioEngine::fifoWriter::run(lmms::AudioEngine::fifoWriter * const this) (/home/michael/Eigene Dateien/Development/LMMS/lmms-dev-mg/lmms/src/core/AudioEngine.cpp:1245)
libQt5Core.so.5![Unknown/Just-In-Time compiled code] (Unbekannte Quelle:0)