[CRIU] Checkpointing failed

[Tycho Andersen]

On Tue, Oct 07, 2014 at 10:15:20AM +0100, Thouraya TH wrote:
> root at u1:/# sudo umount /sys/fs/fuse/
> umount : /sys/fs/fuse/ : n'est pas monté

I think the mountpoint is /sys/fs/fuse/connections according to your
output below. You might try that path instead.

> !!
> it doesn't work

Yes, I'm not sure if you can unmount fuse until you unmount all the
fuse filesystems that are mounted (sshfs, encfs, etc.).

Tycho

> As you know i have already done this:
> 
> root at u1:/# sudo umount /sys/fs/pstore
> root at u1:/# vim /etc/fstab
> root at u1:/# vim /etc/fstab
> 
> i have only this line in the file:
> -- > # UNCONFIGURED FSTAB FOR BASE SYSTEM
> 
> root at u1:/# rmdir /sys/fs/pstore
> rmdir: échec de suppression de «/sys/fs/pstore»: Permission non accordée
> root at u1:/# sudo rmdir /sys/fs/pstore
> rmdir: échec de suppression de «/sys/fs/pstore»: Permission non accordée
> root at u1:/# sudo su
> root at u1:/#  rmdir /sys/fs/pstore
> rmdir: échec de suppression de «/sys/fs/pstore»: Permission non accordée
> root at u1:/#
> 
> Bests.
> 
> 2014-10-07 10:10 GMT+01:00 Pavel Emelyanov <xemul at parallels.com>:
> 
> > On 10/07/2014 12:48 PM, Thouraya TH wrote:
> > > Thanks for answer :)
> > >
> > > sudo umount /sys/fs/fuse/
> > >
> > > That's it ?
> >
> > Yes
> >
> > > Bests.
> > >
> > > 2014-10-07 9:23 GMT+01:00 Pavel Emelyanov <xemul at parallels.com <mailto:
> > xemul at parallels.com>>:
> > >
> > >     On 10/06/2014 09:18 PM, Thouraya TH wrote:
> > >     > Hello :) Thanks for answer :)
> > >     >
> > >     > root at u1:/# cd /sys/fs/fuse/connections
> > >     > root at u1:/sys/fs/fuse/connections# ls
> > >     > 30
> > >     > root at u1:/sys/fs/fuse/connections# cd 30/
> > >     > root at u1:/sys/fs/fuse/connections/30# ls
> > >     > abort  congestion_threshold  max_background  waiting
> > >     >
> > >     > root at u1:~# cat /proc/self/mountinfo
> > >     > 69 52 8:1 /var/lib/lxc/u1/rootfs / rw,relatime - ext4
> > /dev/disk/by-uuid/afcb71d4-c111-4988-ae14-df81b2a06181
> > rw,errors=remount-ro,data=ordered
> > >     > 70 69 0:32 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
> > >     > 71 69 0:33 / /sys rw,relatime - sysfs sysfs rw
> > >     > 72 71 0:16 / /sys/fs/fuse/connections rw,relatime - fusectl none rw
> > >     > 73 71 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw
> > >     > 74 71 0:10 / /sys/kernel/security rw,relatime - securityfs none rw
> > >     > 75 71 0:14 /fs/pstore /sys/fs/pstore
> > rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
> > >     > 53 69 0:34 / /dev/pts rw,relatime - devpts devpts
> > rw,gid=5,mode=620,ptmxmode=666
> > >     > 54 69 0:34 /ptmx /dev/ptmx rw,relatime - devpts devpts
> > rw,gid=5,mode=620,ptmxmode=666
> > >     > 55 71 0:35 / /sys/fs/cgroup rw,relatime - tmpfs none
> > rw,size=4k,mode=755
> > >     > 56 69 0:36 / /run rw,nosuid,noexec,relatime - tmpfs none
> > rw,size=97708k,mode=755
> > >     > 57 56 0:37 / /run/lock rw,nosuid,nodev,noexec,relatime - tmpfs
> > none rw,size=5120k
> > >     > 58 56 0:38 / /run/shm rw,nosuid,nodev,relatime - tmpfs none rw
> > >     > 59 56 0:39 / /run/user rw,nosuid,nodev,noexec,relatime - tmpfs
> > none rw,size=102400k,mode=755
> > >
> > >     Ah I see. In the upstream kernel fuse and fusectl are not
> > virtualized. So
> > >     the latter fs when mounted inside container reveals fuse mounts from
> > all
> > >     the system. And criu fails to dump one, though none of the
> > connections
> > >     seen inside fusectl belong to this container.
> > >
> > >     Serge, Tycho, do you have any ideas what can we do about it?
> > >
> > >     Thouraya, I think for your experiments you can just umount the
> > fusectl fs.
> > >
> > >     Thanks,
> > >     Pavel
> > >
> > >
> >
> >