How to kill processes in “D” state in Linux

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If a process is shown with process state "D" in tools like ps or top, then it's an uninterruptable process. Example:

ps axl | grep D

F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
4   104  2579  9109  20   0   5024  2116 refrig D    ?          0:00 cleanup -z -t unix -u -c

Zombie processes can not be killed with the normal commands like "kill -9 PID", you will have to reboot the system to kill them.

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