Red Hat Bugzilla – Bug 223186
umount cannot unmount cifs mount
Last modified: 2014-06-18 03:35:52 EDT
# mount|grep cifs //box/c$ on /mnt/box type cifs (rw,mand) --------------------------^^^^ # umount /mnt/box This utility only unmounts cifs filesystems. This utility only unmounts cifs filesystems.
Do you have /sbin/umount.cifs ? (or smbfs) For this kind of filesystems the mount command doesn't do anything. It calls other FS specific util only.
Yes. # /sbin/umount.cifs /mnt/box This utility only unmounts cifs filesystems.
well, It doesn't look like problem in the mount command.
Can you attach the full contents of /proc/self/mounts and /etc/mtab ?
I can't, but I can post the relevant parts: /proc/self/mounts has no entry for /mnt/box /etc/mtab does: //box/c$ /mnt/box cifs rw,mand 0 0 Note that the box rebooted since I initially mounted it. It's off at the moment, and I can't unmount it. Same for when it's on.
Can you confirm and explain how to reproduce this?
Yes, mount a cifs share on a windows box, then poweroff the windows box. Power it on again, and you can't unmount it. I need to restest with FC6.
In this case this is a CIFS VFS kernel module problem not a mount utility problem. Moved to kernel
Don't actually remember this happening on FC5 but it certainly happens on my FC6 work machine. I'll update to F7 shortly and will try it again (or may try it on my home F7 machine.)
Please let me know if this is still an issue. If so, then please strace the umount so we can see where it's falling down: # strace -f umount /mnt/box
Unfortunately I no longer have access to this box, so I should unsubscribe myself from this bug.
Seems to work on my FC7 box and I don't ever remember seeing this again after upgrading to FC7. I'm now on kernel-2.6.22.9-91.fc7, samba-3.0.26a-0.fc7.i386.rpm samba-client-3.0.26a-0.fc7.i386.rpm, samba-common-3.0.26a-0.fc7.i386.rpm, though, so can't say for sure if stock FC7 worked.
Ok, let's close this then. Please reopen if the problem returns.