kern/49217: "installboot" fails under NetBSD/amd64

[tron%zhadum.org.uk@localhost]

>Number:         49217
>Category:       kern
>Synopsis:       "installboot" fails under NetBSD/amd64
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 19 09:00:01 +0000 2014
>Originator:     tron%zhadum.org.uk@localhost
>Release:        NetBSD 7.99.1 sources from HEAD from 2014-09-19 ~06:30 UTC
>Organization:
Matthias Scheler                                 https://zhadum.org.uk/
>Environment:
System: NetBSD lyssa.zhadum.org.uk 7.99.1 NetBSD 7.99.1 (GENERIC) #0: Fri Sep 
19 09:13:02 BST 2014 
tron%lyssa.zhadum.org.uk@localhost:/src/sys/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
It seems that "installboot" can no longer update bootblocks under
NetBSD/amd64 current:

        tron@lyssa:~#installboot -v /dev/rwd0a /usr/mdec/bootxx_ffsv1
        installboot: Opening file system `/dev/rwd0a' read-write: Device busy

Martin Husemann suggested that this problem is a result of the
wedges auto-configuration changes. I'm therefore submitting this in
category "kern" rather than "amd64".

>How-To-Repeat:
Read installboot(1) and follow the instructions for installing the bootblock.

>Fix:
Not known.