kern/52357: LFS can sleep forever in bufdirop state

[Shinichi Doyashiki <clare%csel.org@localhost>]

>Number:         52357
>Category:       kern
>Synopsis:       LFS can sleep forever in bufdirop state
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 02 08:50:00 +0000 2017
>Originator:     Shinichi Doyashiki
>Release:        NetBSD 8.99.1
>Organization:
	at home
>Environment:
System: NetBSD kanako.csel.org 8.99.1 NetBSD 8.99.1 (KANAKO) #8: Mon Jun 12 07:05:20 JST 2017 clare%kanako.csel.org@localhost:/export/stage/hack/sys/arch/amd64/compile/KANAKO amd64
Architecture: x86_64
Machine: amd64
>Description:
	LFS can sleep forever in bufdirop state
>How-To-Repeat:
	1. setup LFS filesystem for objdir
	2. run build.sh -j8
>Fix:
	unknown