Orphaned process "D" state Post: 303034239

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Operating Systems Linux Red Hat Orphaned process "D" state Post 303034239 by Yoda on Monday 22nd of April 2019 10:54:04 AM

04-22-2019

Moderator

Here are the different process state codes and description:-

Code:

D    Uninterruptible sleep (usually IO)
R    Running or runnable (on run queue)
S    Interruptible sleep (waiting for an event to complete)
T    Stopped, either by a job control signal or because it is being traced.
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.

As you can see, D means uninterruptible sleep usually due to an IO.

You can check the wchan - name of the kernel function in which the process is sleeping to understand what exactly is going on:-

Code:

ps -eo pid,ppid,state,wchan=WIDE-WCHAN-COLUMN,comm,args | ( read -r; printf "  %s\n" "$REPLY"; grep <your process name/pid> )

Usually it will be a exit_mm() function to release all memory descriptors and related data structures.

As per linux kernel documentation, it first of all checks mm->core_waiters flag is set. If it does, then the process is dumping the contents of memory to a core file (IO). If that is the case, I believe to avoid corruption, it will not respond to a KILL signal until the core file dumping is completed.

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killall

killall(1M)															       killall(1M)

NAME

       killall - kill all active processes

SYNOPSIS

       [signal]

DESCRIPTION

       is a procedure used by to kill all active processes not directly related to the shutdown procedure.

       is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted.  sends
       the specified signal to all user processes in the system, with the following exceptions:

	      the process;

	      all processes (including background processes) associated with the terminal from which was invoked;

	      any process, if owned by

	      any process, if owned by

	      any process;

	      any process;

	      any process.

       obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).

       If no signal is specified, a default of (kill) is used.

       is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).

FILES

SEE ALSO

       fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).

STANDARDS CONFORMANCE

																       killall(1M)