bin/42018: nbmake hangs using -j on Solaris

[sketch%netbsd.org@localhost]

>Number:         42018
>Category:       bin
>Synopsis:       nbmake hangs using -j on Solaris
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 08 15:10:00 +0000 2009
>Originator:     Jonathan Perkin
>Release:        Current
>Organization:
The NetBSD Project
>Environment:
Solaris 10u7
>Description:
build.sh with any -j value hangs on Solaris immediately during cleandir.  I've 
narrowed down the test case to

$ cat Makefile
CLEANFILES+= ojnk
.include <bsd.hostprog.mk>

Then run:

$ truss -f -o truss.out /var/tmp/obj/tooldir.SunOS-5.10-i86pc/bin/nbmake -dA -m 
/netbsd/src/share/mk -j1 cleandir >make.out 2>&1

hangs with looping pollsys, pstack on a separate non-truss run is

 fef2a445 pollsys  (80d1938, 2, 8046890, 0)
 feecf592 poll     (80d1938, 2, 1388, 805bde8) + 52
 0805bd9f Job_CatchOutput (806e4f0, 1, 8046908, 805c0c9, 8081655, 8085798) + 47
 08062061 Make_Run (8085860, 8085860, 80472b8, 805f57e) + 95
 0805f591 main     (5, 80472ec, 8047304, fefa3e40) + 979
 08053acd _start   (5, 8047418, 8047449, 804744c, 8047461, 8047465) + 7d

$ ptree `pgrep -f nbmake`
27565  truss -f -o truss.out /var/tmp/obj/tooldir.SunOS-5.10-i86pc/bin/nbmake 
-dA -m /
  27566  /var/tmp/obj/tooldir.SunOS-5.10-i86pc/bin/nbmake -dA -m 
/netbsd/src/share/mk -j
    27997  <defunct>

make and truss output are available at

  http://www.perkin.org.uk/makejbug/
>How-To-Repeat:
./build.sh -j1 [...] on Solaris
>Fix: