bin/41654: sh(1) hangs while collecting command substitution output

[bad%bsd.de@localhost]

>Number:         41654
>Category:       bin
>Synopsis:       sh(1) hangs collection output for "eval $(cmd)"
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 30 21:55:00 +0000 2009
>Originator:     Christoph Badura
>Release:        NetBSD 5.99.14 iso-image from 20090627 autobuild
>Organization:
bozotic netbsd software testing labs
>Environment:
        
        
System: NetBSD 5.99.14
Architecture: i386
Machine: i386
>Description:
        
Boot the i386 installation ISO image.  In sysinst select the utility menu
and run /bin/sh.
Enter the following commands
(
eval $(fdisk -S wd0)
)

The top-level shell hangs in "piperd".  The job is suspendable with ^Z.
ps shows a zombie from the fdisk command hanging around.

The system in question is a PIII 866 MHz with 256MB RAM detected.

This is repeatable every time when immediately running /sbin/sh from
sysinst's Utility menue after booting into sysinst.

>How-To-Repeat:
        
see above.

>Fix:
        
dunno.

>Unformatted: