Could a process appear in top actually got stuck?

Besides, I have read a post here a command ps -o s= -p <pid> could show stopped process if the output is T.

I tried the command with various pid and have given me output R and S.

Any idea on what T, R and S mean?

Thank you.


man ps will give you more details:

           D    uninterruptible sleep (usually IO)
           R    running or runnable (on run queue)
           S    interruptible sleep (waiting for an event to complete)
           T    stopped by job control signal
           t    stopped by debugger during the tracing
           W    paging (not valid since the 2.6.xx kernel)
           X    dead (should never be seen)
           Z    defunct ("zombie") process, terminated but not reaped by
                its parent

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