From: Scott Mcdermott <smcdermott@questra.com>
Subject: Re: Re: broken umount -f
Date: Wed, 15 Jan 2003 00:19:28 -0500
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Lever, Charles on Tue 14/01 11:36 -0800:
> > Last I checked, the programs wouldn't die even with -KILL when they
> > were stuck in device-wait state.  The only way to reboot a machine
> > with such processes is to reboot -f, which is wrong.  The
> > filesystems should be able to have forced umount at sysadmin's
> > discretion.
> 
> do you remember which kernel this was?
> 
> trond fixed a long-standing "processes stuck in 'D' state" bug in
> 2.4.20.  this bug may be the reason these processes didn't die when
> you killed them.

<on client>

# uname -r
2.4.21-pre3-NFS_ALL

# showmount --exports nfsserver
Export list for nfsserver
/tmp           10.0.0.5

# mount nfsserver:/tmp /mnt/tmp

# cd /mnt/tmp

# ssh nfsserver /etc/init.d/nfs stop
Shutting down NFS mountd: [  OK  ]
Shutting down NFS daemon: [  OK  ]
Shutting down NFS services:  [  OK  ]
Shutting down NFS quotas: [  OK  ]

# /bin/pwd
nfs: server nfsserver not responding, still trying

<hangs>

<now on other tty with pwd=/>

# ps -eo state,wchan,pid,command | grep ^D
D end     1472 /bin/pwd

# kill -KILL 1472

# umount -f /mnt/tmp
Cannot MOUNTPROG RPC: RPC: Program not registered
umount2: Device or resource busy
umount: /mnt/tmp: device is busy

# kill -KILL 1472
# kill -KILL 1472

# umount -f /mnt/tmp
Cannot MOUNTPROG RPC: RPC: Program not registered
umount2: Device or resource busy
umount: /mnt/tmp: device is busy

# kill -KILL 1472
# kill -KILL 1472
# kill -KILL 1472
# kill -KILL 1472
# kill -KILL 1472
# kill -KILL 1472
# kill -KILL 1472

# umount -f /mnt/tmp
Cannot MOUNTPROG RPC: RPC: Program not registered
umount2: Device or resource busy
umount: /mnt/tmp: device is busy

# kill -KILL 1472

# ps -eo state,wchan,pid,command | grep ^D
D end     1472 /bin/pwd


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