Kill stops too much processes

Hi , to all Lilux Users,

We have migrated some of our AIX and Solaris Programs to Linux with some success. We are
hitting only smaller "features" like this one where we find no real explanations , even by googling.

So the problem is when we kill one process all the processes of the user are killed. But to make it
more complicated not all the time , so it is not reproductible.

If someone knows a hint to this ….

Thanks in advance

Hoffmann Marcel

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[operator@pportlc1 monitor]$ ps -fu operator

UID        PID PPID C STIME TTY          TIME CMD
operator 14975 14974 0 10:26 ?        00:00:00 sh
operator 14976 14975 0 10:26 ?        00:00:00 /bin/bash
operator 14977 14976 0 10:26 ?        00:00:00 /bin/ksh ./lanceMonitor.ksh
operator 14978 14977 0 10:26 ?        00:00:00 /bin/ksh ./processMonitor.ksh /home/operator/echg/monitor/config/processmonitor.properties

operator 14979 14978 0 10:26 ? 00:01:51 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -cp lib/clientutil.jar:lib/mail.jar:lib/log4j-1.2.11.jar:lib/client

operator 23738 23737 0 11:50 ?        00:00:00 sh
operator 23739 23738 0 11:50 ?        00:00:00 /bin/bash
operator 23740 23739 0 11:50 ?        00:00:00 /bin/ksh ./Lance_VerifEchgGedb.ksh
operator 23741 23740 0 11:50 ?        00:00:01 /bin/ksh /home/operator/echg/bdl/bin/VerifEchgGedb.ksh operator /home/operator/echg/bdl/bin

operator 23745 23741 0 11:50 ? 00:00:00 /bin/ksh /home/operator/echg/bdl/bin/LanceEchgGedb.ksh
operator 23747 23745 1 11:50 ? 00:03:27 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -Dfile.encoding=iso-8859-1 -DHTTPClient.log.mask=-1 -cp /home/bea/w

operator 23822 23821 0 11:51 ?        00:00:00 sh
operator 23823 23822 0 11:51 ?        00:00:00 /bin/bash
operator 23824 23823 0 11:51 ?        00:00:00 /bin/bash
operator 23825 23824 0 11:51 ?        00:02:07 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -Dapiopc.repbase=/home/operator -Dapiopc.replog=/home/log/operator/

operator 24213 24201 0 17:05 pts/1    00:00:00 -bash
operator 24617 23741 0 17:09 ?        00:00:00 sleep 30
operator 24620 24213 0 17:09 pts/1    00:00:00 ps -fu operator

[operator@pportlc1 monitor]$ kill -9 14978

[operator@pportlc1 monitor]$ ps -fu operator

UID        PID PPID C STIME TTY          TIME CMD
operator 24213 24201 0 17:05 pts/1    00:00:00 -bash
operator 24661 24213 0 17:09 pts/1    00:00:00 ps -fu operator

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