Bug ID: 62117
           Summary: contains misleading error message
           Product: Tomcat 8
           Version: 8.5.x-trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Catalina
  Target Milestone: ---- contains the following snippet:
kill -0 `cat "$CATALINA_PID"` >/dev/null 2>&1
if [ $? -gt 0 ]; then
    echo "PID file found but no matching process was found. Stop aborted."
    exit 1

Sending the signal 0 to a given PID checks if 
- any process with the given PID is running *and*
- you have the permission to send a signal to it.

Now assume the tomcat process was running as root and the is
executed as user tomcat. Then the file $CATALINA_PID exists (as well as the
process) but kill -0 returns an error because the tomcat user has no
permissions to kill the root process.
So the message is incomplete, thus misleading.

The error message should instead be like
"PID file found but either no matching process was found or no permission to
stop the process. Stop aborted."

This problem not only exists in Tomcat 8.x but also in the source trunk and in
Tomcat 9.

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