No more existing process still accept kill -0

Solution Unverified - Updated -

Issue

In order to synchronize two processes, kill -0 signal is used, but also if the precess is no more shown by ps -ef command nor in the /proc directory, the kill command does not return 0 in $?.
The process ID is 8372 but , also if the ls /proc doesn't show the directory, it is accessible via cd /proc/8372 .

Environment

  • Red Hat Enterprise Linux 6

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