I want to umount a path , I have checked what process is running in the path by lsof , now I found that there are three processes is running , I try to kill this process but can't , it is strange that the pid is change and change , every time I use lsof , the output is different , so I can't kill any process , can advise how can I umount it ? thx


#lsof /orc_tmp
lsof 14429 root cwd DIR 232,48 4096 32769 /orc_tmp
lsof 14430 root cwd DIR 232,48 4096 32769 /orc_tmp
bash 21871 root cwd DIR 232,48 4096 32769 /orc_tmp

#lsof /orc_tmp
lsof 14434 root cwd DIR 232,48 4096 32769 /orc_tmp
lsof 14435 root cwd DIR 232,48 4096 32769 /orc_tmp
bash 21871 root cwd DIR 232,48 4096 32769 /orc_tmp

#lsof /orc_tmp
lsof 14441 root cwd DIR 232,48 4096 32769 /orc_tmp
lsof 14442 root cwd DIR 232,48 4096 32769 /orc_tmp
bash 21871 root cwd DIR 232,48 4096 32769 /orc_tmp

To kill root processes you need to be logged in as root. It's also possible that only root has been set with the right to umount.

Your result is strange, can you use ps aux | grep lsof see whether it lsof still running?

And, you may give fuser a try,
#fuser -m /orc_tmp

Good lucks,
Ks