Here are the different values that the s, stat and state output specifiers (header "STAT" or "S") will

   display to describe the state of a process:

           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

   For BSD formats and when the stat keyword is used, additional characters may be displayed:

           <    high-priority (not nice to other users)

           N    low-priority (nice to other users)

           L    has pages locked into memory (for real-time and custom IO)

           s    is a session leader

           l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)

           +    is in the foreground process group