Description of problem:

When running ksh scripts on RHEL 5 (and RHEL 6) multiple processes are reported running when $(ps -ef |grep $BNAME|grep -v grep |wc -l).  Expect only "1" to be returned but often times see 2+ returned.

[code]
#!/bin/ksh93

BNAME=`basename $0`
OUT="`ps -ef|grep ${BNAME} | grep -v grep |wc -l`"
if [ ${OUT} -ge "2" ];then
   echo "FAIL"
   exit 1
else
   echo "SUCCESS"
fi
[/code]

Version-Release number of selected component (if applicable):
<= ksh-20100202-1.el5_5.1 (RHEL5)
<= ksh-20100621-6.el6.x86_64 (RHEL6)


How reproducible:

Every time, use code snippet above.


Steps to Reproduce:
1. Create a ksh script as noted above.
2. Run script
  
Actual results:
FAIL
(indicating 2+ pids returned)

Expected results:
SUCESS
(indicating 1 pid returned)

Additional info:

RHEL 5.6 (ksh-20100202-1.el5_5.1)
# ./test5.6.ksh 
+ basename ./test5.6.ksh
+ BNAME=test5.6.ksh
+ ps -ef
+ grep test5.6.ksh
+ grep -v grep
+ wc -l
+ OUT=2
+ [ 2 -ge 2 ]
+ echo FAIL
FAIL
+ exit 1

Fedora 15 (ksh-20110505-2.fc15.x86_64)
# ./test.ksh
+ basename ./test.ksh
+ BNAME=test.ksh
+ ps -ef
+ grep test.ksh
+ grep -v grep
+ wc -l
+ OUT=1
+ [ 1 -ge 2 ]
+ echo SUCCESS
SUCCESS

I feel the following patch may have provided the fix; however, I can not get the patch into the RHEL 5 version of ksh.

* Wed Jun 08 2011 Michal Hlavinka <mhlavink> - 20110505-2
- fix: resume of suspended process using pipes does not work (#708909)