bin/57894: sh(1): PID obtained with jobs -p is always 0 on NetBSD 10.0 RC

[koichi%nksm.name@localhost]

>Number:         57894
>Category:       bin
>Synopsis:       sh(1): PID obtained with jobs -p is always 0 on NetBSD 10.0 RC
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 30 13:35:00 +0000 2024
>Originator:     Koichi Nakashima
>Release:        NetBSD 10.0_RC3
>Organization:
>Environment:
NetBSD vm-netbsd10-0.home 10.0_RC3 NetBSD 10.0_RC3 (GENERIC) #0: Tue Jan 16 08:28:51 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
on NetBSD 10.0 RC3
$ sh -c 'sleep 3 & echo $!; jobs -l; jobs -p'
7975
[1] + 7975 Running            sleep 3 &
0

on NetBSD 9.3
$ sh -c 'sleep 3 & echo $!; jobs -l; jobs -p'
573
[1] + 573 Running             sleep 3 &
573
>How-To-Repeat:

>Fix: