Thread 1 (Thread 0x7ffff7f99a00 (LWP 5312)):
#0  0x00007ffff1053cc9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff10570d8 in __GI_abort () at abort.c:89
#2  0x00007ffff4b69453 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4bd8993 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffff4b94668 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fffad103692 in OSC::stop (this=0x7fffffffc6e0) at ../libs/surfaces/osc/osc.cc:265
#6  0x00007fffad102990 in OSC::~OSC (this=0x7fffffffc6e0, __in_chrg=<optimized out>)
    at ../libs/surfaces/osc/osc.cc:96
#7  0x00007fff8c3790bc in PresetManager::loadPresets() () from /home/ralf/b-step-trial/DiscoveryPro.so
#8  0x00007fff8c37a124 in PresetManager::PresetManager(CDiscovery*) ()
   from /home/ralf/b-step-trial/DiscoveryPro.so
#9  0x00007fff8c392d49 in CDiscovery::CDiscovery() () from /home/ralf/b-step-trial/DiscoveryPro.so
#10 0x00007fff8c3932ca in createPluginFilter() () from /home/ralf/b-step-trial/DiscoveryPro.so
---Type <return> to continue, or q <return> to quit---
#11 0x00007fff8c6ccaeb in createPluginFilterOfType(juce::AudioProcessor::WrapperType) ()
   from /home/ralf/b-step-trial/DiscoveryPro.so
#12 0x00007fff8c6cec9a in VSTPluginMain () from /home/ralf/b-step-trial/DiscoveryPro.so
#13 0x00007ffff7386fe9 in vstfx_instantiate (fhandle=0x4032fc0, amc=
    0x7ffff73876c4 <ARDOUR::Session::vst_callback(_AEffect*, int, int, long, void*, float)>,
    userptr=0x432c800) at ../libs/ardour/linux_vst_support.cc:314
#14 0x00007ffff7385d4c in ARDOUR::LXVSTPlugin::LXVSTPlugin (this=0x432c800, e=..., session=...,
    h=0x4032fc0, unique_id=1146115704) at ../libs/ardour/lxvst_plugin.cc:36
#15 0x00007ffff73861db in ARDOUR::LXVSTPluginInfo::load (this=0x26673f0, session=...)
    at ../libs/ardour/lxvst_plugin.cc:80
#16 0x00000000014d5df6 in PluginSelector::load_plugin (this=0x2935ae0, pi=...)
    at ../gtk2_ardour/plugin_selector.cc:415
#17 0x00000000014d652b in PluginSelector::run (this=0x2935ae0) at ../gtk2_ardour/plugin_selector.cc:492
#18 0x00000000014d8a2a in PluginSelector::show_manager (this=0x2935ae0)
    at ../gtk2_ardour/plugin_selector.cc:861