CompTIA Linux+ Powered by LPI (LX0-103) — Question 38

After running the command umount /mnt, the following error message is displayed: umount: /mnt: device is busy.
What is a common reason for this message?

Answer options

• A. The kernel has not finished flushing disk writes to the mounted device.
• B. A user has a file open in the /mnt directory.
• C. Another file system still contains a symlink to a file inside /mnt.
• D. The files in /mnt have been scanned and added to the locate database.
• E. The kernel thinks that a process is about to open a file in /mnt for reading.

Correct answer: B

Explanation

The correct answer is B, as having an open file in the /mnt directory prevents the umount command from successfully unmounting it. Options A, C, D, and E do not directly refer to the situation where a user is actively utilizing a file in that directory, which is the primary cause of the 'device is busy' error.