OS.open_midi_inputs crashes with dummy audio

[qarmin]

Godot version

4.0.dev.custom_build. 22b2253

System information

Ubuntu 21.04 - Nvidia GTX 970, Gnome shell 3.38 X11

Issue description

Running project with

godot4 --audio-driver Dummy 

crashes with this backtrace

[1] godot4s(+0x3203960e) [0x564aa9e8a60e] (??:0)
[2] /lib/x86_64-linux-gnu/libc.so.6(+0x41040) [0x7f7843149040] (??:0)

when using OS.open_midi_inputs()

Steps to reproduce

Above

Minimal reproduction project

No response

[akien-mga]

gdb backtrace:

(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x0000000003b2e457 in MIDIDriverALSAMidi::open (this=0x7fffffffd360) at drivers/alsamidi/midi_driver_alsamidi.cpp:130
#2  0x0000000006021ada in OS::open_midi_inputs (this=0x7fffffffd200) at core/os/os.cpp:471
#3  0x0000000005f990e6 in core_bind::OS::open_midi_inputs (this=0xaada900) at core/core_bind.cpp:179
#4  0x000000000253dc0e in call_with_ptr_args_helper<__UnexistingClass>(__UnexistingClass*, void (__UnexistingClass::*)(), void const**, IndexSequence<>) (p_instance=0xaada900, 
    p_method=&virtual table offset 160, p_args=0x0) at ./core/variant/binder_common.h:243
#5  0x000000000253d0ec in call_with_ptr_args<__UnexistingClass> (p_instance=0xaada900, p_method=&virtual table offset 160, p_args=0x0) at ./core/variant/binder_common.h:491
#6  0x000000000253ae36 in MethodBindT<>::ptrcall(Object*, void const**, void*) (this=0xab77ff0, p_object=0xaada900, p_args=0x0, r_ret=0x0) at ./core/object/method_bind.h:295
#7  0x000000000362a740 in GDScriptFunction::call (this=0xc03e950, p_instance=0xc9a1860, p_args=0x0, p_argcount=0, r_err=..., p_state=0x0) at modules/gdscript/gdscript_vm.cpp:1868
#8  0x000000000352fbe4 in GDScript::_create_instance (this=0xc9a3d60, p_args=0x0, p_argcount=0, p_owner=0xbe61880, p_is_ref_counted=false, r_error=...) at modules/gdscript/gdscript.cpp:154
#9  0x00000000035310d6 in GDScript::instance_create (this=0xc9a3d60, p_this=0xbe61880) at modules/gdscript/gdscript.cpp:371
#10 0x00000000064960bc in Object::set_script (this=0xbe61880, p_script=...) at core/object/object.cpp:892
#11 0x000000000601e146 in MainLoop::initialize (this=0xbe61880) at core/os/main_loop.cpp:61
#12 0x00000000022fa7db in OS_LinuxBSD::run (this=0x7fffffffd200) at platform/linuxbsd/os_linuxbsd.cpp:330
#13 0x00000000022f6f23 in main (argc=5, argv=0x7fffffffd718) at platform/linuxbsd/godot_linuxbsd.cpp:58

[akien-mga]

Still reproducible in 4.0 RC 3.

The crash happens here:

Error MIDIDriverALSAMidi::open() {
	void **hints;

	if (snd_device_name_hint(-1, "rawmidi", &hints) < 0) {
		return ERR_CANT_OPEN;
	}

Apparently this API is not safe to call when using the dummy driver. There should be a way to error out earlier on if no suitable audio driver is configured.