kern/51721: audio_suspend mutex_vector_enter: locking against myself

[coypu%sdf.org@localhost]

>Number:         51721
>Category:       kern
>Synopsis:       audio_suspend mutex_vector_enter: locking against myself
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 15 18:35:00 +0000 2016
>Originator:     coypu
>Release:        NetBSD 7.99.50
>Organization:
>Environment:
NetBSD 7.99.50 amd64
>Description:
# sysctl -w hw.acpi.sleep.state=3
...
System panicked: lock error: Mutex: mutex_vector_enter: locking against myself: lock 0xfffffe81071ad010 cpu 0 lwp 0xfffffe81355479c0
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NARCNET() at 0
?() at fffffe81355479c0
vpanic() at vpanic+0x149
snprintf() at snprintf
lockdebug_abort() at lockdebug_abort+0x63
mutex_vector_enter() at mutex_vector_enter+0x369
audio_suspend() at audio_suspend+0x25
device_pmf_driver_suspend() at device_pmf_driver_suspend+0x46
pmf_device_suspend_locked() at pmf_device_suspend_locked+0xeb
pmf_device_suspend() at pmf_device_suspend+0x41
pmf_system_suspend() at pmf_system_suspend+0xc1
acpi_enter_sleep_state() at acpi_enter_sleep_state+0x12c
sysctl_hw_acpi_sleepstate() at sysctl_hw_acpi_sleepstate+0xfe
sysctl_dispatch() at sysctl_dispatch+0xc1
sys___sysctl() at sys___sysctl+0xd8
syscall() at syscall+0x1df
--- syscall (number 202) ---
772b9030ca8a:


>How-To-Repeat:

>Fix: