kern/52277: exiting unheld spin mutex in opencrypto

[coypu%sdf.org@localhost]

>Number:         52277
>Category:       kern
>Synopsis:       exiting unheld spin mutex in opencrypto
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 06 13:00:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 8.99.1
>Organization:
>Environment:
NetBSD  8.99.1 NetBSD 8.99.1 (GENERIC) #0: Tue Jun  6 12:18:53 UTC 2017  fly@:/home/fly/obj/sys/arch/amd64/compile/GENERIC amd64

>Description:
System panicked: lock error: Mutex: mutex_vector_exit,720: exiting unheld spin mutex: lock 0xfffffe8137da30b8 cpu 0 lwp 0xfffffe812d134500
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NARCNET() at 0
ostype() at ostype+0xab2ee
vpanic() at vpanic+0x149
snprintf() at snprintf
lockdebug_abort() at lockdebug_abort+0x6e
mutex_vector_exit() at mutex_vector_exit+0xe4
crypto_getfeat() at crypto_getfeat+0x89
cryptof_ioctl() at cryptof_ioctl+0x417
sys_ioctl() at sys_ioctl+0x101
syscall() at syscall+0x1d8
--- syscall (number 54) ---
7bcbde0ce8ba:


Last commit at the time of my git src

commit 8950439ed31715d506c672ec88d7c2094e4da370
Author: skrll <skrll>
Date:   Tue Jun 6 07:45:39 2017 +0000

    Add libfdt
>How-To-Repeat:

>Fix: