kern/52185: panic: audio_init_ringbuffer: blksize=0

[Manuel.Bouyer%lip6.fr@localhost]

>Number:         52185
>Category:       kern
>Synopsis:       panic: audio_init_ringbuffer: blksize=0
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 21 17:35:00 +0000 2017
>Originator:     Manuel Bouyer
>Release:        HEAD as of a few minutes ago
>Organization:
>Environment:
System: NetBSD chartplotter 7.99.70 NetBSD 7.99.70 (CHARTPLOTTER) #7: Fri Apr 21 18:57:58 MEST 2017 evbarm
Architecture: earmv7hf
Machine: evbarm
>Description:
	When starting an application, I guess at first audio open, the system
	panics with:
login: panic: audio_init_ringbuffer: blksize=0
cpu0: Begin traceback...
0xbf5a1b7c: netbsd:db_panic+0xc
0xbf5a1b94: netbsd:vpanic+0x1b4
0xbf5a1bac: netbsd:snprintf
0xbf5a1bd4: netbsd:audio_initbufs
0xbf5a1cb4: netbsd:audio_open+0x400
0xbf5a1cec: netbsd:audioopen+0xbc
0xbf5a1d5c: netbsd:spec_open+0x204
0xbf5a1d84: netbsd:VOP_OPEN+0x44
0xbf5a1e5c: netbsd:vn_open+0x250
0xbf5a1edc: netbsd:do_open+0xb0
0xbf5a1f0c: netbsd:do_sys_openat+0x7c
0xbf5a1f34: netbsd:sys_open+0x38
0xbf5a1fac: netbsd:syscall+0x108
	
	the audio device is:
awinac0 at awinio0: CODEC
audio0 at awinac0: full duplex, playback, capture, mmap, independent
awinac0: Virtual format configured - Format SLINEAR, precision 16, channels 2, frequency 48000

	This doens't happens with an older kernel from May 2016.
	Using audioplay doesn't trigger this.

>How-To-Repeat:
	run opencpn (with the watchdog plugin).
>Fix:
	unkown