Issues of emulate audio input on Linux guest be run on Windows host

[流風]

I have some audio issue when I use Windows 10 host and run the Linux Guest (Ubuntu 16.04) on Virtualbox 5.0.26 and Virtualbox 5.1.2 (5.1.4).

I have test the the audio emulation settings, AC97 and IntelHD
1. Audio input and output are both workable, but the guest OS crash (freeze, and one thing I can do is force interrupt by the window close button [X] ) sometimes when I use pyaudio to start record audio. Not every time but randomly happen.

2. Audio output is workable but the audio input is not, when I test by Ubuntu audio setting, I can not see any sound pressure when I make noise.

If anyone can help me, I will appreciate of your help.

[socratis]

I don't know about the output, but for the input there is a bug report available: #15802: [Regression] No microphone, Windows Guest, Linux Host. Contribute your experience, with logs, in the ticket.

[Galvictor]

I'm having the same issue after virtualbox update. I'm using Arch Linux and virtualbox guest utils and Windows 10 as Host. If I put Intel HD works, but the sound come oddly like an echo or a little delay (if you are watching an youtube video). In my case if I change back to AC97 works normal with a little delay, and if I reboot again, stop to working.