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how to kill a 'mount' command that has hung


How does one kill a 'mount' command that has hung ?

NetBSD x53u 6.99.10 NetBSD 6.99.10 (GENERIC) #0: Tue Aug 28 05:55:38 UTC 2012

 . Take a external USB disk formatted with ext3fs file system.
 . run a 'find *.*' or 'mplayer'
 . after about 3-4 min. the mount will hang.
 . the LED on the disk will be blinking fast.


1. Attempting to perform a 'kill -9 mountPID' simply returns a prompt, but the 
mount command continues to hang.

2. both WCPU and CPU show system CPU utilization range as 98.3 - 98.9%. after 
about 20 minutes or so, the CPU utilization comes down to 55%.

3. a user login in another terminal succeeds.

4. a user app eg. 'alpine' starting an alternate editor 'vi' hangs.

5. a kill -9 attempt to a user process from another root terminal has not 
affect, ie. the command simply returns but the process is there.

6. /sbin/shutdown -p now' command hangs at 'shutdown hooks' message. the only 
way to shutdown is to press the power switch.

if the 'kill' command is not the solution, what is the recommended approach ?


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