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kern/48459: Using btsco(4) causes kernel panic

>Number:         48459
>Category:       kern
>Synopsis:       Using btsco(4) causes kernel panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 19 13:40:00 +0000 2013
>Originator:     Cherry G. Mathew
nemo$ uname -a
NetBSD nemo 6.99.23 NetBSD 6.99.23 (GENERIC) #1: Mon Jul 29 00:13:06 IST 2013  
While trying to play audio via audioplay, I get the following:

panic: kernel diagnostic assertion "kpreempt_disabled()" failed: file 
"/home/cherry/unbackedup/source/src/sys/kern/kern_softint.c", line 461 
cpu6: Begin traceback...
vpanic() at netbsd:vpanic+0x136
kern_assert() at netbsd:kern_assert+0x48
softint_schedule() at netbsd:softint_schedule+0xf6
btsco_start_output() at netbsd:btsco_start_output+0x39
audiostartp() at netbsd:audiostartp+0xef
audio_drain() at netbsd:audio_drain+0x171
audio_ioctl() at netbsd:audio_ioctl+0x1b4
audioioctl() at netbsd:audioioctl+0xb9
VOP_IOCTL() at netbsd:VOP_IOCTL+0x3b
vn_ioctl() at netbsd:vn_ioctl+0x76
sys_ioctl() at netbsd:sys_ioctl+0x13c
syscall() at netbsd:syscall+0x9a
--- syscall (number 54) ---
cpu6: End traceback...



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