kern/52685: audio stutters

[martin%NetBSD.org@localhost]

>Number:         52685
>Category:       kern
>Synopsis:       audio stutters
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 01 09:20:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.5
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD whoever-brings-the-night.aprisoft.de 8.99.5 NetBSD 8.99.5 (WHOEVER) #184: Wed Nov 1 09:46:49 CET 2017 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/sparc64/compile/WHOEVER sparc64
Architecture: sparc64
Machine: sparc64
>Description:

With very recent audio changes, there is a noticable repeating/stuttering
echo in audio rendering.

>How-To-Repeat:

Use mpg123 to play something on 

audio0 at autri0: full duplex, playback, capture, mmap, independent
autri0: Virtual format configured - Format SLINEAR, precision 16, channels 2, frequency 48000
midi0 at autri0: 4DWAVE MIDI UART

>Fix:
n/a