Re: 5.2-RELEASE panic in turnstile_wait

On 29 Jan, Erik Moe wrote:
> Humm....  crashing the stack for fun and profit....
> 
> 
> (kgdb) frame 7
> #7  0xc0546015 in _mtx_lock_sleep (m=0xc69e0aa8, opts=0,
>     file=0xc06f3a10 "/usr/src/sys/kern/kern_exit.c", line=453)
>     at /usr/src/sys/kern/kern_mutex.c:476
> 476			turnstile_wait(ts, &m->mtx_object, mtx_owner(m));
> (kgdb) p *m
> $1 = {mtx_object = {lo_class = 0x0, lo_name = 0x0, lo_type = 0x0,
>     lo_flags = 0, lo_list = {tqe_next = 0x0, tqe_prev = 0x0},
>     lo_witness = 0x0}, mtx_lock = 0, mtx_recurse = 0}

Hmn, lots of zeros.  Would you happen to be using audio hardware with
vchans?