Host audio not working after launching the guest

[ncj]

I have an issue where the host audio disappears/doesn't work after the guest is launched.

I have tried disabling the guest audio (VM setting no audio), and full audio from the VM settings, but this makes no difference. During the boot, the audio for the host disappears. I've booted with the guest extensions installed and uninstalled, both exhibit the same outcome. Host is macOS Catalina (10.15.4), Touch Bar 2018 MacBook Pro.

After the VM is shutdown, the host audio will return, but it has a slight echo at the end of any audio play, just as the audio ends it stutters.

It was first noticed by me in 6.1.2, but may have been earlier and persists in 6.1.6 and 6.0.20. Hardware diagnostics return no errors on the host.

I have reduced the RAM allocated, from 4G (50%) to 3G and the audio seems to be ok. From a thread in the forums (​https://forums.virtualbox.org/viewtopic.php?f=8&t=96902), a new guest (VDI) built from scratch seems to be ok.

I copied the VM over to a non-touch bar MacBook Pro (late 2016) and it appears to run without breaking the host audio (logs also attached).

[ncj]

Logs

[ncj]

Logs

[ncj]

Logs

[ncj]

macOS 10.15.3

[ncj]

The issue exists in v 6.1.8 as well.

[yohanc]

I observed the same issue with macOS 10.15.7 (MaxBook Pro 2019) and VitualBox 6.1.16 (Windows 10 VM). Any chance to have a fix? This seriously limits the usability of the VM.

[aim]

Confirmed for HOST VB 6.1.22 r144080 (Qt5.6.3) 10.15.7 (19H1030) MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports) 16 ГБ 2133 MHz LPDDR3

guest Linux aim-server.crtdev.local 5.12.1-arch1-1 #1 SMP PREEMPT Sun, 02 May 2021 12:43:58 +0000 x86_64 GNU/Linux

[aim]

It is still replicated for the lastest VB and Catalina

[aim]

from macOS console

notice  12:39:53.815629+0400    coreauthd   Starting approve discovery
notice  12:39:53.815819+0400    coreauthd   Activating
notice  12:39:53.815885+0400    coreauthd   Activate
notice  12:39:53.816363+0400    coreauthd   XPC started
notice  12:39:53.816589+0400    coreauthd   ### Unexpectedly invalidated
error   12:39:53.816627+0400    coreauthd   ### Discovery invalidated.
notice  12:39:53.816660+0400    coreauthd   Invalidated
notice  12:39:53.816777+0400    coreauthd   Will try to restart approve discovery in 3600.0 sec.
error   12:39:53.816843+0400    coreauthd   Approve discovery activation failed: Error Domain=NSCocoaErrorDomain Code=4099 UserInfo={NSDebugDescription=<private>}
notice  12:39:53.816879+0400    coreauthd   Invalidating
error   12:39:53.816906+0400    coreauthd   Approve discovery invalidated
notice  12:39:53.816927+0400    coreauthd   Will try to restart approve discovery in 60.0 sec.
notice  12:39:53.816955+0400    coreauthd   Invalidated