Ubuntu
fuse package

Unmount of sshfs fails

Bug #188811 reported by none
24
This bug affects 4 people
Affects Status Importance Assigned to Milestone
fuse (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

I have my account at a web hosting provider mounted via sshfs. If I only use fusermount to mount and unmount, everything works perfectly. I thought I'd use fstab instead and added the line

sshfs#nullinfinity.org: /home/jbr/Desktop/nullinfinity fuse user,noauto

to /etc/fstab. I can then still mount my account using "mount /home/jbr/Desktop/nullinfinity" and access my files normally.

BUT: when I try to unmount the account using "umount /home/jbr/Desktop/nullinfinity" the umount goes haywire:

$ ps auxw |grep umount |wc -l
269
$ ps auxw |grep umount |wc -l
bash: pipe error: Too many open files in system
bash: start_pipeline: pgrp pipe: Too many open files in system
$

Now there's lots of disk activity and the OOM killer starts killing random processes. If I do Ctrl-C on the umount process quickly enough, I can recover. But sometimes the only thing that helped was a hard poweroff.

This is with fuse-utils 2.7.2-1ubuntu1 on Hardy/amd64 and kernel 2.6.24-5.8-generic. I've also tried running the system with the Feisty kernel and the same thing happened.

Revision history for this message
Daniel T Chen (crimsun) wrote :

Is this symptom still reproducible in 8.10 or 9.04?

Changed in fuse:
status: New → Incomplete
Revision history for this message
none (ubuntu-bugs-nullinfinity-deactivatedaccount) wrote :

With a fully up-to-date Intrepid, the unmounting no longer kills the system. However, it's still buggy. When I carry out the exact same steps as above and try to unmount I get

$ umount ~/Desktop/nullinfinity
umount: /home/jbr/Desktop/nullinfinity mount disagrees with the fstab

Revision history for this message
Scott Talbert (swt-techie) wrote :

I see the same problem with Intrepid. I can't un-mount sshfs with 'umount'. 'fusermount' works fine.

Changed in fuse:
status: Incomplete → Confirmed
Revision history for this message
Dawning (dawning) wrote :

My Intreprid (amd64) that's fully up to date is also having these "..disagrees with the fstab" issues. I have been dealing with it by unmounting with "sudo umount -f <mount dir>" - but I don't like that "fix" as I mount the shares as a user and of course that's not addressing whatever the problem really is.

I've also noticed on a box that I'm sshfs connecting to a new problem involing (I think) a kernel module crashing. My /var/log/messages has core dumps from several processes that periodically die. That issue is causing my UI to freeze for minutes at a time - I'm not convinced that it is related to this issue.

Revision history for this message
Luke Schlather (luke2760) wrote :

The umount bit is documented in this bug:

https://bugs.launchpad.net/ubuntu/+source/sshfs-fuse/+bug/243298

If the thrashing crash issue has disappeared, then I think this bug can be marked as fixed.

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