[Linux] audiohost segfault on sample plugin

[jhammen]

Ubuntu 22.04 "jammy"

audiohost loads and runs the noteexpressionsynth sample but segfaults on exit:

/vst3test/build/bin/Debug$ ./audiohost /home/john/Desktop/vst3test/build/VST3/Debug/noteexpressionsynth.vst3
Press <enter> to continue . . .
Segmentation fault (core dumped)

GDB stacktrace:

Reading symbols from ./audiohost...
(gdb) run /vst3test/build/VST3/Debug/noteexpressionsynth.vst3
Starting program: /vst3test/build/bin/Debug/audiohost /vst3test/build/VST3/Debug/noteexpressionsynth.vst3

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff5e5c640 (LWP 276805)]
[New Thread 0x7ffff5c67640 (LWP 276806)]
[New Thread 0x7ffff5be4640 (LWP 276807)]
Press <enter> to continue . . .
[Thread 0x7ffff5be4640 (LWP 276807) exited]
[Thread 0x7ffff5c67640 (LWP 276806) exited]
[Thread 0x7ffff5e5c640 (LWP 276805) exited]

Thread 1 "audiohost" received signal SIGSEGV, Segmentation fault.
0x0000555555603320 in ?? ()
(gdb) bt
#0  0x0000555555603320 in  ()
#1  0x00007ffff728840a in VSTGUI::SharedPointer<VSTGUI::CFontDesc>::operator=(VSTGUI::CFontDesc*) (this=0x7ffff7842660 <VSTGUI::globalFonts>, _ptr=0x0)
    at /vst3test/vst3sdk/vstgui4/vstgui/lib/vstguibase.h:441
#2  0x00007ffff74d5c04 in VSTGUI::CFontDesc::cleanup() () at /vst3test/vst3sdk/vstgui4/vstgui/lib/cfont.cpp:96
#3  0x00007ffff7588528 in VSTGUI::exit() () at /vst3test/vst3sdk/vstgui4/vstgui/lib/vstguiinit.cpp:20
#4  0x00007ffff72af445 in operator()() const (__closure=0x555555612628) at /vst3test/vst3sdk/public.sdk/source/vst/vstguieditor.cpp:67
#5  0x00007ffff72b0796 in std::__invoke_impl<void, <lambda()>&>(std::__invoke_other, struct {...} &) (__f=...) at /usr/include/c++/11/bits/invoke.h:61
#6  0x00007ffff72b05d6 in std::__invoke_r<void, <lambda()>&>(struct {...} &) (__fn=...) at /usr/include/c++/11/bits/invoke.h:111
#7  0x00007ffff72b038c in std::_Function_handler<void(), <lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at /usr/include/c++/11/bits/std_function.h:290
#8  0x00007ffff72a5658 in std::function<void ()>::operator()() const (this=0x555555612628) at /usr/include/c++/11/bits/std_function.h:590
#9  0x00007ffff72b2285 in Steinberg::(anonymous namespace)::sortAndRunFunctions(Steinberg::(anonymous namespace)::FunctionVector&) (array=std::vector of length 1, capacity 1 = {...})
    at /vst3test/vst3sdk/public.sdk/source/main/moduleinit.cpp:84
#10 0x00007ffff72b2375 in DeinitModule() () at /vst3test/vst3sdk/public.sdk/source/main/moduleinit.cpp:121
#11 0x00007ffff728c757 in ModuleExit() () at /vst3test/vst3sdk/public.sdk/source/main/linuxmain.cpp:77
#12 0x000055555558c9f9 in VST3::Hosting::(anonymous namespace)::LinuxModule::~LinuxModule() (this=0x5555555e4fa0, __in_chrg=<optimized out>)
    at /vst3test/vst3sdk/public.sdk/source/vst/hosting/module_linux.cpp:140
#13 0x000055555558f17b in __gnu_cxx::new_allocator<VST3::Hosting::(anonymous namespace)::LinuxModule>::destroy<VST3::Hosting::(anonymous namespace)::LinuxModule>(VST3::Hosting::(anonymous namespace)::LinuxModule*) (this=0x5555555e4fa0, __p=0x5555555e4fa0) at /usr/include/c++/11/ext/new_allocator.h:168
#14 0x000055555558f147 in std::allocator_traits<std::allocator<VST3::Hosting::(anonymous namespace)::LinuxModule> >::destroy<VST3::Hosting::(anonymous namespace)::LinuxModule>(std::allocator_traits<std::allocator<VST3::Hosting::(anonymous namespace)::LinuxModule> >::allocator_type&, VST3::Hosting::(anonymous namespace)::LinuxModule*) (__a=..., __p=0x5555555e4fa0)
    at /usr/include/c++/11/bits/alloc_traits.h:535
#15 0x000055555558f00b in std::_Sp_counted_ptr_inplace<VST3::Hosting::(anonymous namespace)::LinuxModule, std::allocator<VST3::Hosting::(anonymous namespace)::LinuxModule>, (__gnu_cxx::_Lock_policy)2>::_M_dispose() (this=0x5555555e4f90) at /usr/include/c++/11/bits/shared_ptr_base.h:528
#16 0x000055555557f285 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (this=0x5555555e4f90) at /usr/include/c++/11/bits/shared_ptr_base.h:168
#17 0x000055555557de5f in std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count() (this=0x5555555e47f0, __in_chrg=<optimized out>) at /usr/include/c++/11/bits/shared_ptr_base.h:705
#18 0x000055555557d23c in std::__shared_ptr<VST3::Hosting::Module, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr() (this=0x5555555e47e8, __in_chrg=<optimized out>)
    at /usr/include/c++/11/bits/shared_ptr_base.h:1154
#19 0x000055555557d25c in std::shared_ptr<VST3::Hosting::Module>::~shared_ptr() (this=0x5555555e47e8, __in_chrg=<optimized out>) at /usr/include/c++/11/bits/shared_ptr.h:122
#20 0x000055555557c0da in Steinberg::Vst::AudioHost::App::~App() (this=0x5555555e47e0, __in_chrg=<optimized out>)
    at /vst3test/vst3sdk/public.sdk/samples/vst-hosting/audiohost/source/audiohost.cpp:68
#21 0x000055555557c106 in Steinberg::Vst::AudioHost::App::~App() (this=0x5555555e47e0, __in_chrg=<optimized out>)
    at /vst3test/vst3sdk/public.sdk/samples/vst-hosting/audiohost/source/audiohost.cpp:68
#22 0x000055555557e4be in std::default_delete<Steinberg::Vst::EditorHost::IApplication>::operator()(Steinberg::Vst::EditorHost::IApplication*) const
    (this=0x5555555d1890 <Steinberg::Vst::AudioHost::gInit>, __ptr=0x5555555e47e0) at /usr/include/c++/11/bits/unique_ptr.h:85
#23 0x000055555557d47e in std::unique_ptr<Steinberg::Vst::EditorHost::IApplication, std::default_delete<Steinberg::Vst::EditorHost::IApplication> >::~unique_ptr()
    (this=0x5555555d1890 <Steinberg::Vst::AudioHost::gInit>, __in_chrg=<optimized out>) at /usr/include/c++/11/bits/unique_ptr.h:361
#24 0x000055555558296a in Steinberg::Vst::AudioHost::AppInit::~AppInit() (this=0x5555555d1890 <Steinberg::Vst::AudioHost::gInit>, __in_chrg=<optimized out>)
    at /vst3test/vst3sdk/public.sdk/samples/vst-hosting/audiohost/source/platform/appinit.h:48
#25 0x00007ffff7b24495 in __run_exit_handlers (status=0, listp=0x7ffff7cf8838 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at ./stdlib/exit.c:113
#26 0x00007ffff7b24610 in __GI_exit (status=<optimized out>) at ./stdlib/exit.c:143
#27 0x00007ffff7b08d97 in __libc_start_call_main (main=main@entry=0x55555557c99d <main(int, char**)>, argc=argc@entry=2, argv=argv@entry=0x7fffffffe088) at ../sysdeps/nptl/libc_start_call_main.h:74
#28 0x00007ffff7b08e40 in __libc_start_main_impl
     (main=0x55555557c99d <main(int, char**)>, argc=2, argv=0x7fffffffe088, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe078) at ../csu/libc-start.c:392
#29 0x0000555555566635 in _start ()
(gdb) quit
A debugging session is active.

	Inferior 1 [process 276802] will be killed.

Quit anyway? (y or n) y