install/50327: Panic on Boot and after loading all packages

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>Number:         50327
>Category:       install
>Synopsis:       Panic on Boot and after loading all packages
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 10 20:25:00 +0000 2015
>Originator:     Bill Parker
>Release:        7.0
>Organization:
>Environment:
N/A (happened on boot from ISO image
>Description:
Mutex Error: mutex_vector_exit: exiting unheld spin mutex

Lock Address: 0xfffffe804dfd2c20
current cpu:  0
current lwp:  0xfffffe8042836160
owner field:  0x0000000000000700 wait/spin:       0/1

panic: lock error
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip 0xffffffff80281dc5 cs 8 rflags 246 cr2 7f7ff7b00028 ilevel 0 rsp fffffe80427d9ca0 
curlwp 0xfffffe8042836160 pid 5.1 lowest kstack 0xfffffe80427d72c0
stopped in pid 5.1 (sh) at netbsd: breakpoint+0x5: leave
db{0}>
>How-To-Repeat:
Happens on booting from ISO image (AMD64), md5 checksum is a match with site value
>Fix: