Red Hat Bugzilla – Bug 436965
Shutdown hangs on "Unmounting NCP filesystems"
Last modified: 2009-01-09 01:09:36 EST
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Description of problem:
The systems hangs on the message "Unmounting NCP filesystems" when a shutdown or reboot is issued.
This is caused by an NCP mount that was mounted, but not unmounted before the ethernet network-cable of the laptop was disconnected.
Version-Release number of selected component (if applicable):
util-linux-ng-2.13.1-1.fc8 initscripts-8.60-1 kernel-18.104.22.168-2.fc8xen
Steps to Reproduce:
1. Mount an NCP filesystem (automatically using /etc/fstab) or using a normal mount command
2. Disconnect the ethernet cable of the machine
3. Initiate a normal shutdown of the machine (poweroff)
The system hangs on the unmount of the NCP filesystem
A timeout should occur on the NCP filesystem and the shutdown-sequence should continue the normal way.
Contents of /etc/fstab:
NWALR/.EKA.CONSUMENT&BELEIDSINFORMATIE.NCCW.ALMERE.WRG /mnt/nwalr ncp ipserver=nwalr.ict-beheer.local,volume=USR,uid=eka,gid=users,passwdfile=/etc/ncp.passwd,tcp,user,rw,auto 0 0
I see init scripts umounting NCP by
[ -n "$NCPMTAB" ] && action $"Unmounting NCP filesystems: " umount -a -t ncpfs
I think the problem is mismatch between your /etc/fstab where is "ncp" and
/etc/init.d/netfs init scipt where is "ncpfs".
BTW, is it really possible to umount NCP by umount(8), I see there is
/usr/bin/ncpumount too. (I've zero experience with NCP/IPX)
Manual mounts and unmounts of the ncp filesystem do work nicely.
Only the unmount with a disconnected network fails.
I changed the filesystem-type in /etc/fstab from 'ncp' to 'ncpfs'.
I can still mount and unmount the filesystem, but the mentioned problem still
occurs when the network is disconnected before the unmount.
(In reply to comment #2)
> Manual mounts and unmounts of the ncp filesystem do work nicely.
> Only the unmount with a disconnected network fails.
Please, try (with disconnected network):
strace -f -o umount.log umount -v /mountpoint
I'd like to see the log file.
You can also try to use force umount (umount -f).
> I changed the filesystem-type in /etc/fstab from 'ncp' to 'ncpfs'.
> I can still mount and unmount the filesystem, but the mentioned problem still
well, the FS name is important for "umount -a -t ncpfs", because umount(8) is
trying to found relevant mountpoints in /etc/mtab by the FS name.
> occurs when the network is disconnected before the unmount.
It doesn't seem like a umount(8) bug, I guess it's any disadvantage in your
setting or NCP filesystem driver.
I made the requested strace for a normal unmount, a hanging unmount and a
hanging forced unmount. (see attachments)
And (maybe) some extra useful information:
[root@pc02019666 bin]# ll /sbin/mount*
-rwxr-xr-x 1 root root 23672 2007-12-10 17:03 /sbin/mount.cifs
lrwxrwxrwx 1 root root 19 2007-12-20 12:02 /sbin/mount.ncp -> ../usr/bin/ncpmount
lrwxrwxrwx 1 root root 19 2007-12-20 12:02 /sbin/mount.ncpfs ->
-rwsr-xr-x 1 root root 55456 2007-10-18 01:34 /sbin/mount.nfs
lrwxrwxrwx 1 root root 9 2007-12-05 09:19 /sbin/mount.nfs4 -> mount.nfs
[root@pc02019666 bin]# ll /sbin/umount*
-rwxr-xr-x 1 root root 10700 2007-12-10 17:03 /sbin/umount.cifs
-rwxr-xr-x 1 root root 7644 2007-10-12 00:59 /sbin/umount.hal
lrwxrwxrwx 1 root root 9 2007-12-05 09:19 /sbin/umount.nfs -> mount.nfs
lrwxrwxrwx 1 root root 9 2007-12-05 09:19 /sbin/umount.nfs4 -> mount.nfs
[root@pc02019666 bin]# ll /usr/bin/ncp*
-rwsr-xr-x 1 root root 285668 2007-08-23 14:08 /usr/bin/ncplogin
lrwxrwxrwx 1 root root 9 2007-12-20 12:02 /usr/bin/ncplogout -> ncpumount
-rwsr-xr-x 1 root root 281412 2007-08-23 14:08 /usr/bin/ncpmap
-rwxr-xr-x 1 root root 283100 2007-08-23 14:08 /usr/bin/ncpmount
-rwxr-xr-x 1 root root 254236 2007-08-23 14:08 /usr/bin/ncpumount
Created attachment 297766 [details]
Strace output of normal working unmount (with network connected)
Created attachment 297767 [details]
Strace output of hanging unmount (with network disconnected)
Created attachment 297768 [details]
Strace output of hanging unmount (with network disconnected and forced unmount)
It hangs on oldumount() and also in umount() syscalls. Reassigning to kernel.
Do other network filesystems time out after a while, or do they hang too?
(In reply to comment #7)
> Created an attachment (id=297768) 
> Strace output of hanging unmount (with network disconnected and forced unmount)
What is the status of the hanging process (from ps)
I don't have any other network-based mounts, so I can't tell if other network
filesystems hang as well.
And this is the process status of the hanging unmount:
[eka@pc02019666 ~]$ ps aux|grep nwalr
root 8601 0.0 0.0 4316 748 pts/1 S+ 21:04 0:00 umount -f
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