Klirrfactory VCM: crashes Rack when removing

Start with a blank patch, add VCM, right click delete it, Rack crashes. Only seems to be this module with the problem.

Running linux (neon) with current v1 release and latest download of the free mixer modules from the klirrfactory website.

@KlirrFactory

Fwiw I tried to recreate the problem on my Win10 laptop and could not reproduce the crash. Also running the latest releases of Rack & plugins.

1 Like

@TroubledMind tried to do the same on Ubuntu (I’m not a Linux guy) - and I can’t provoke a crash(what means nothing).
So give me some time to try to figure out, what’s happening.

:wink:

1 Like

@KlirrFactory I managed to get a log output for this crash:

[0.000 info src/main.cpp:113] VCV Rack v1.1.3
[0.000 info src/main.cpp:114] Linux 5.0.0-23-lowlatency #24~18.04.1-Ubuntu SMP PREEMPT Mon Jul 29 18:50:25 UTC 2019 x86_64
[0.000 info src/main.cpp:120] Args: /home/alex/.local/opt/Rack/Rack 
[0.000 info src/main.cpp:123] System directory: .
[0.000 info src/main.cpp:124] User directory: /home/alex/.Rack
[0.000 info src/settings.cpp:213] Loading settings /home/alex/.Rack/settings-v1.json
[0.000 info src/main.cpp:146] Initializing environment
[0.087 info src/plugin.cpp:157] Loaded plugin Core v1.1.3 from 
[0.093 info src/plugin.cpp:157] Loaded plugin AS v1.0.3 from /home/alex/.Rack/plugins-v1/AS
[0.094 info src/plugin.cpp:157] Loaded plugin Ahornberg v1.0.1 from /home/alex/.Rack/plugins-v1/Ahornberg
[0.095 info src/plugin.cpp:157] Loaded plugin Alikins v1.0.1 from /home/alex/.Rack/plugins-v1/Alikins
[0.095 info src/plugin.cpp:157] Loaded plugin AlrightDevices v1.0.0 from /home/alex/.Rack/plugins-v1/AlrightDevices
[0.097 info src/plugin.cpp:157] Loaded plugin AmalgamatedHarmonics v1.0.1 from /home/alex/.Rack/plugins-v1/AmalgamatedHarmonics
[0.098 info src/plugin.cpp:157] Loaded plugin AnimatedCircuits v1.0.0 from /home/alex/.Rack/plugins-v1/AnimatedCircuits
[0.100 info src/plugin.cpp:157] Loaded plugin AudibleInstruments v1.0.0 from /home/alex/.Rack/plugins-v1/AudibleInstruments
[0.102 info src/plugin.cpp:157] Loaded plugin AudibleInstruments-Altered v1.0.0 from /home/alex/.Rack/plugins-v1/AudibleInstruments-Altered
[0.103 info src/plugin.cpp:157] Loaded plugin Autinn v1.0.0 from /home/alex/.Rack/plugins-v1/Autinn
[0.105 info src/plugin.cpp:157] Loaded plugin Autodafe v1.0.1 from /home/alex/.Rack/plugins-v1/Autodafe
[0.105 info src/plugin.cpp:157] Loaded plugin Autodafe-DrumKit v1.0.0 from /home/alex/.Rack/plugins-v1/Autodafe-DrumKit
[0.106 info src/plugin.cpp:157] Loaded plugin Autodafe-REDsFREE v1.0.0 from /home/alex/.Rack/plugins-v1/Autodafe-REDsFREE
[0.108 info src/plugin.cpp:157] Loaded plugin BaconMusic v1.0.2 from /home/alex/.Rack/plugins-v1/BaconMusic
[0.108 info src/plugin.cpp:157] Loaded plugin Bark v1.1.1 from /home/alex/.Rack/plugins-v1/Bark
[0.109 info src/plugin.cpp:157] Loaded plugin Befaco v1.0.0 from /home/alex/.Rack/plugins-v1/Befaco
[0.112 info src/plugin.cpp:157] Loaded plugin Bidoo v1.0.5 from /home/alex/.Rack/plugins-v1/Bidoo
[0.112 info src/plugin.cpp:157] Loaded plugin Blamsoft-XFXDistortionPack v1.0.0 from /home/alex/.Rack/plugins-v1/Blamsoft-XFXDistortionPack
[0.113 info src/plugin.cpp:157] Loaded plugin Blamsoft-XFXF35 v1.0.0 from /home/alex/.Rack/plugins-v1/Blamsoft-XFXF35
[0.113 info src/plugin.cpp:157] Loaded plugin Blamsoft-XFXReverb v1.0.0 from /home/alex/.Rack/plugins-v1/Blamsoft-XFXReverb
[0.113 info src/plugin.cpp:157] Loaded plugin Blamsoft-XFXWave v1.0.1 from /home/alex/.Rack/plugins-v1/Blamsoft-XFXWave
[0.116 info src/plugin.cpp:157] Loaded plugin Bogaudio v1.1.22 from /home/alex/.Rack/plugins-v1/Bogaudio
[0.117 info src/plugin.cpp:157] Loaded plugin CYC v1.0.0 from /home/alex/.Rack/plugins-v1/CYC
[0.117 info src/plugin.cpp:157] Loaded plugin CatroModulo v1.0.2 from /home/alex/.Rack/plugins-v1/CatroModulo
[0.118 info src/plugin.cpp:157] Loaded plugin CharredDesert v1.0.1 from /home/alex/.Rack/plugins-v1/CharredDesert
[0.118 info src/plugin.cpp:157] Loaded plugin ChortlingHamsterModules v1.0.0 from /home/alex/.Rack/plugins-v1/ChortlingHamsterModules
[0.119 info src/plugin.cpp:157] Loaded plugin Circlefade v1.0.1 from /home/alex/.Rack/plugins-v1/Circlefade
[0.121 info src/plugin.cpp:157] Loaded plugin CountModula v1.2.1 from /home/alex/.Rack/plugins-v1/CountModula
[0.122 info src/plugin.cpp:157] Loaded plugin DHE-Modules v1.0.4 from /home/alex/.Rack/plugins-v1/DHE-Modules
[0.130 info src/plugin.cpp:157] Loaded plugin DrumKit v1.1.0 from /home/alex/.Rack/plugins-v1/DrumKit
[0.130 info src/plugin.cpp:157] Loaded plugin ESeries v1.0.1 from /home/alex/.Rack/plugins-v1/ESeries
[0.130 info src/plugin.cpp:157] Loaded plugin Edge v1.0.2 from /home/alex/.Rack/plugins-v1/Edge
[0.131 info src/plugin.cpp:157] Loaded plugin Entrian-Free v1.1.0 from /home/alex/.Rack/plugins-v1/Entrian-Free
[0.132 info src/plugin.cpp:157] Loaded plugin EricaCopies v1.0.2 from /home/alex/.Rack/plugins-v1/EricaCopies
[0.133 info src/plugin.cpp:157] Loaded plugin FrozenWasteland v1.8.0 from /home/alex/.Rack/plugins-v1/FrozenWasteland
[0.134 info src/plugin.cpp:157] Loaded plugin Fundamental v1.2.0 from /home/alex/.Rack/plugins-v1/Fundamental
[0.135 info src/plugin.cpp:157] Loaded plugin Geodesics v1.0.0 from /home/alex/.Rack/plugins-v1/Geodesics
[0.136 info src/plugin.cpp:157] Loaded plugin GoodSheperd v1.0.0 from /home/alex/.Rack/plugins-v1/GoodSheperd
[0.137 info src/plugin.cpp:157] Loaded plugin HetrickCV v1.0.0 from /home/alex/.Rack/plugins-v1/HetrickCV
[0.137 info src/plugin.cpp:157] Loaded plugin HolonicSystems-Free v1.0.2 from /home/alex/.Rack/plugins-v1/HolonicSystems-Free
[0.138 info src/plugin.cpp:157] Loaded plugin Hora-Mixers v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-Mixers
[0.138 info src/plugin.cpp:157] Loaded plugin Hora-ModulationFree v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-ModulationFree
[0.138 info src/plugin.cpp:157] Loaded plugin Hora-PCMDrumFree v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-PCMDrumFree
[0.139 info src/plugin.cpp:157] Loaded plugin Hora-ProcessorsFree v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-ProcessorsFree
[0.139 info src/plugin.cpp:157] Loaded plugin Hora-VCO_VCF_VCA_Free v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-VCO_VCF_VCA_Free
[0.139 info src/plugin.cpp:157] Loaded plugin Hora-treasureFree v1.0.1 from /home/alex/.Rack/plugins-v1/Hora-treasureFree
[0.141 info src/plugin.cpp:157] Loaded plugin ImpromptuModular v1.1.1 from /home/alex/.Rack/plugins-v1/ImpromptuModular
[0.143 info src/plugin.cpp:157] Loaded plugin JW-Modules v1.0.7 from /home/alex/.Rack/plugins-v1/JW-Modules
[0.143 info src/plugin.cpp:157] Loaded plugin KarateSnoopy v1.0.0 from /home/alex/.Rack/plugins-v1/KarateSnoopy
[0.144 info src/plugin.cpp:157] Loaded plugin KlirrFactoryFree v1.0.3 from /home/alex/.Rack/plugins-v1/KlirrFactoryFree
[0.144 info src/plugin.cpp:157] Loaded plugin KlirrFactoryWS v1.2.1 from /home/alex/.Rack/plugins-v1/KlirrFactoryWonkySEQ
[0.145 info src/plugin.cpp:157] Loaded plugin Koralfx-Modules v1.0.2 from /home/alex/.Rack/plugins-v1/Koralfx-Modules
[0.146 info src/plugin.cpp:157] Loaded plugin LindenbergResearch v1.0.0 from /home/alex/.Rack/plugins-v1/LindenbergResearch
[0.147 info src/plugin.cpp:157] Loaded plugin LomasModules v1.0.1 from /home/alex/.Rack/plugins-v1/LomasModules
[0.148 info src/plugin.cpp:157] Loaded plugin ML_modules v1.0.2 from /home/alex/.Rack/plugins-v1/ML_modules
[0.148 info src/plugin.cpp:157] Loaded plugin MicMusic v1.0.0 from /home/alex/.Rack/plugins-v1/MicMusic
[0.149 info src/plugin.cpp:157] Loaded plugin ModularFungi v1.0.0 from /home/alex/.Rack/plugins-v1/ModularFungi
[0.149 info src/plugin.cpp:157] Loaded plugin MosquitoLabs v1.1.1 from /home/alex/.Rack/plugins-v1/MosquitoLabs
[0.149 info src/plugin.cpp:157] Loaded plugin MyLittleTools v1.0.2 from /home/alex/.Rack/plugins-v1/MyLittleTools
[0.159 info src/plugin.cpp:157] Loaded plugin NYSTHI v1.0.3 from /home/alex/.Rack/plugins-v1/NYSTHI
[0.161 info src/plugin.cpp:157] Loaded plugin Ohmer v1.1.3.1 from /home/alex/.Rack/plugins-v1/Ohmer
[0.162 info src/plugin.cpp:157] Loaded plugin OhmerPrems v1.0.2 from /home/alex/.Rack/plugins-v1/OhmerPrems
[0.162 info src/plugin.cpp:157] Loaded plugin PatchAndTweak v1.0.1 from /home/alex/.Rack/plugins-v1/PatchAndTweak
[0.162 info src/plugin.cpp:157] Loaded plugin Prism v1.0.2 from /home/alex/.Rack/plugins-v1/Prism
[0.163 info src/plugin.cpp:157] Loaded plugin QuantalAudio v1.0.0 from /home/alex/.Rack/plugins-v1/QuantalAudio
[0.163 info src/plugin.cpp:157] Loaded plugin RB-Tilter v1.0.1 from /home/alex/.Rack/plugins-v1/RB-Tilter
[0.165 info src/plugin.cpp:157] Loaded plugin RJModules v1.0.1 from /home/alex/.Rack/plugins-v1/RJModules
[0.165 info src/plugin.cpp:157] Loaded plugin SLM v1.1.0 from /home/alex/.Rack/plugins-v1/SLM
[0.166 info src/plugin.cpp:157] Loaded plugin STS v1.0.3 from /home/alex/.Rack/plugins-v1/STS
[0.166 info src/jaq.cc:156] We linked to JACK :^)
[0.187 info src/bridge.cpp:382] Bridge server started
[0.203 info src/plugin.cpp:157] Loaded plugin SkJack v1.0.0 from /home/alex/.Rack/plugins-v1/SkJack
[0.204 info src/plugin.cpp:157] Loaded plugin Skylights v1.0.2 from /home/alex/.Rack/plugins-v1/Skylights
[0.206 info src/plugin.cpp:157] Loaded plugin SonusModular v1.0.0 from /home/alex/.Rack/plugins-v1/SonusModular
[0.209 info src/plugin.cpp:157] Loaded plugin Starling_Via v1.0.0 from /home/alex/.Rack/plugins-v1/Starling_Via
[0.209 info src/plugin.cpp:157] Loaded plugin StellareModular v1.0.0 from /home/alex/.Rack/plugins-v1/StellareModular
[0.211 info src/plugin.cpp:157] Loaded plugin Stoermelder-P1 v1.1.0 from /home/alex/.Rack/plugins-v1/Stoermelder-P1
[0.214 info src/plugin.cpp:157] Loaded plugin SubmarineFree v1.0.3 from /home/alex/.Rack/plugins-v1/SubmarineFree
[0.217 info src/Surge.cpp:20] [SurgeRack] init
[0.217 info src/plugin.cpp:157] Loaded plugin SurgeRack v1.beta1.1 from /home/alex/.Rack/plugins-v1/SurgeRack
[0.218 info src/plugin.cpp:157] Loaded plugin SynthKit v1.0.1 from /home/alex/.Rack/plugins-v1/SynthKit
[0.219 info src/plugin.cpp:157] Loaded plugin Synthetic v1.0.0 from /home/alex/.Rack/plugins-v1/Synthetic
[0.220 info src/plugin.cpp:157] Loaded plugin TheXOR v1.1.0 from /home/alex/.Rack/plugins-v1/TheXOR
[0.221 info src/plugin.cpp:157] Loaded plugin VCV-Parametra v1.0.0 from /home/alex/.Rack/plugins-v1/VCV-Parametra
[0.221 info src/plugin.cpp:157] Loaded plugin VCV-Recorder v1.0.0 from /home/alex/.Rack/plugins-v1/VCV-Recorder
[0.221 info src/plugin.cpp:157] Loaded plugin VCV-Spectra v1.0.0 from /home/alex/.Rack/plugins-v1/VCV-Spectra
[0.223 info src/plugin.cpp:157] Loaded plugin Valley v1.0.1 from /home/alex/.Rack/plugins-v1/Valley
[0.224 info src/plugin.cpp:157] Loaded plugin VultModulesFree v1.2.0 from /home/alex/.Rack/plugins-v1/VultModulesFree
[0.225 info src/plugin.cpp:157] Loaded plugin VultMysteries v1.2.0 from /home/alex/.Rack/plugins-v1/VultMysteries
[0.225 info src/plugin.cpp:157] Loaded plugin WhatTheRack v1.0.0 from /home/alex/.Rack/plugins-v1/WhatTheRack
[0.225 info src/plugin.cpp:157] Loaded plugin ZZC v1.1.0 from /home/alex/.Rack/plugins-v1/ZZC
[0.227 info src/plugin.cpp:157] Loaded plugin cf v1.1.0 from /home/alex/.Rack/plugins-v1/cf
[0.228 info src/plugin.cpp:157] Loaded plugin computerscare v1.0.3 from /home/alex/.Rack/plugins-v1/computerscare
[0.229 info src/plugin.cpp:157] Loaded plugin dBiz v1.1.2 from /home/alex/.Rack/plugins-v1/dBiz
[0.230 info src/plugin.cpp:157] Loaded plugin moDllz v1.0.0 from /home/alex/.Rack/plugins-v1/moDllz
[0.231 info src/plugin.cpp:157] Loaded plugin modular80 v1.0.0 from /home/alex/.Rack/plugins-v1/modular80
[0.234 info src/plugin.cpp:157] Loaded plugin mscHack v1.0.2 from /home/alex/.Rack/plugins-v1/mscHack
[0.235 info src/plugin.cpp:157] Loaded plugin noobhour v1.0.3 from /home/alex/.Rack/plugins-v1/noobhour
[0.236 info src/plugin.cpp:157] Loaded plugin rcm v1.0.1 from /home/alex/.Rack/plugins-v1/rcm
[0.236 info src/plugin.cpp:157] Loaded plugin repelzen v1.1.0 from /home/alex/.Rack/plugins-v1/repelzen
[0.239 info src/plugin.cpp:157] Loaded plugin squinkylabs-plug1 v1.0.3 from /home/alex/.Rack/plugins-v1/squinkylabs-plug1
[0.241 info src/plugin.cpp:157] Loaded plugin trowaSoft v1.0.1 from /home/alex/.Rack/plugins-v1/trowaSoft
[0.241 info src/plugin.cpp:157] Loaded plugin wiqid-anomalies v1.1.0 from /home/alex/.Rack/plugins-v1/wiqid-anomalies
[0.250 info src/main.cpp:161] Initializing app
[0.515 info src/window.cpp:227] Window content scale: 1.250000
[0.639 info src/window.cpp:267] Renderer: Quadro K2000M/PCIe/SSE2
[0.639 info src/window.cpp:268] OpenGL: 4.6.0 NVIDIA 430.26
[0.678 info src/window.cpp:33] Loaded font ./res/fonts/DejaVuSans.ttf
[0.678 info src/window.cpp:72] Loaded SVG ./res/ComponentLibrary/RackBusboard.svg
[0.682 info src/settings.cpp:196] Saving settings /home/alex/.Rack/settings-v1.json
[0.682 info src/patch.cpp:161] Loading patch /home/alex/.Rack/autosave-v1.vcv
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/VC8BG.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch1off.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch1on.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/KnobGreenSmall2.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/KnobGreen.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/LogicInput.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/Input.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/Output.svg
[0.687 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/OutputData.svg
[0.688 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/VC4BG.svg
[0.689 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/SendsVCBG.svg
[0.693 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/CLOCKBG.svg
[0.694 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch2_1.svg
[0.694 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch2_2.svg
[0.694 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch2_3.svg
[0.694 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/switch2_4.svg
[0.698 info src/window.cpp:72] Loaded SVG /home/alex/.Rack/plugins-v1/KlirrFactoryFree/res/VCMBG.svg
[0.698 info src/main.cpp:173] Starting engine
[0.698 info src/main.cpp:185] Running window
[1.565 warn src/plugin.cpp:424] VCV account has plugin 21kHz but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin 8Mode but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin ArableInstruments but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin arjo_modules but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin com-soundchasing-stochasm but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin Gratrix but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin Grayscale but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin mental but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin MSM but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin NonLinearInstruments but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin ParableInstruments but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin sb-StochKit but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin Southpole but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin Southpole-parasites but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin SubmarineUtility but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin TriggerFish-Elements but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin UnforgettableLuncheon but no manifest was found
[1.565 warn src/plugin.cpp:424] VCV account has plugin unless_modules but no manifest was found
[6.332 fatal src/main.cpp:38] Fatal signal 6. Stack trace:
21: /home/alex/.local/opt/Rack/Rack() [0x56d951]
20: /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7efe4eb64f20]
19: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7) [0x7efe4eb64e97]
18: /lib/x86_64-linux-gnu/libc.so.6(abort+0x141) [0x7efe4eb66801]
17: /lib/x86_64-linux-gnu/libc.so.6(+0x89897) [0x7efe4ebaf897]
16: /lib/x86_64-linux-gnu/libc.so.6(+0x9090a) [0x7efe4ebb690a]
15: /lib/x86_64-linux-gnu/libc.so.6(cfree+0x4cc) [0x7efe4ebbde1c]
14: /home/alex/.Rack/plugins-v1/KlirrFactoryFree/plugin.so(_ZN3VCMD0Ev+0x17) [0x7efe2d4f1ce9]
13: /home/alex/.local/opt/Rack/Rack(_ZN4rack3app12ModuleWidgetD1Ev+0x1a) [0x5a312a]
12: /home/alex/.Rack/plugins-v1/KlirrFactoryFree/plugin.so(_ZN9VCMWidgetD0Ev+0x17) [0x7efe2d4f1d1d]
11: /home/alex/.local/opt/Rack/Rack(_ZN4rack3app12ModuleWidget10onHoverKeyERKNS_5event8HoverKeyE+0x129) [0x5a5307]
10: /home/alex/.local/opt/Rack/Rack(_ZN4rack6widget6Widget10onHoverKeyERKNS_5event8HoverKeyE+0xd8) [0x56d198]
9: /home/alex/.local/opt/Rack/Rack(_ZN4rack3app10RackWidget10onHoverKeyERKNS_5event8HoverKeyE+0xf0) [0x5afc5c]
8: /home/alex/.local/opt/Rack/Rack(_ZN4rack6widget10ZoomWidget10onHoverKeyERKNS_5event8HoverKeyE+0x175) [0x5b47b3]
7: /home/alex/.local/opt/Rack/Rack(_ZN4rack6widget6Widget10onHoverKeyERKNS_5event8HoverKeyE+0xd8) [0x56d198]
6: /home/alex/.local/opt/Rack/Rack(_ZN4rack3app16RackScrollWidget10onHoverKeyERKNS_5event8HoverKeyE+0x15d) [0x5b1497]
5: /home/alex/.local/opt/Rack/Rack(_ZN4rack3app5Scene10onHoverKeyERKNS_5event8HoverKeyE+0xf7) [0x5a8c7b]
4: /home/alex/.local/opt/Rack/Rack(_ZN4rack5event5State11handleHoverENS_4math3VecES3_+0x467) [0x56c493]
3: /home/alex/.local/opt/Rack/Rack(_ZN4rack6Window3runEv+0x1b3) [0x566805]
2: /home/alex/.local/opt/Rack/Rack(main+0x45a) [0x4e6e1a]
1: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7efe4eb47b97]
0: /home/alex/.local/opt/Rack/Rack(_start+0x29) [0x4ebd49]

The crash is not consistent but if you add VCM Mixer and delete it repeatedly it eventually crashes for me.