[Users] unable to migrate / checkpoint

[Stanichenko Marat]

Samuel Tremblay-Cossette wrote on 01.10.2008 23:49:
> Hi,
>
> I'm unable to checkpoint and migrate my VEs. I'm using
> 2.6.24-19-openvz that come with Ubuntu 8.04.
>
> Here is the error message:
>
> root at frontend:~# vzctl chkpnt 2
> Setting up checkpoint...
> 	suspend...
> 	dump...
> Can not dump VE: Invalid argument
> Error: d_path is invisible /dev
> Checkpointing failed
>
>   
Hello,

I'm not sure how that did happen on your node but that message should 
have been appeared when overmount was detected.
I can give a simple example. Let's assume that you have a process that 
opend a file /var/log/messages, after that you decide to use "another" 
/var  directory and for instance do the bind mount from the HN (mount 
--bind /var/ /vz/root/$VEID/var). So, when you try to checkpoint your VE 
you get this message.

May be you've started udev after your VE have been started and any 
process uses "old" /dev directory?
Do you have a way to reproduce it for sure? Is there a particular 
template that leads us to this error message?

Thank You!
> kernel: CPT ERR: f6d61000,2 :d_path is invisible /dev
>
> And some info about my setup:
>
> root at frontend:~# sysctl fs.vsyscall vm.vdso_enabled
> fs.vsyscall = 0
> vm.vdso_enabled = 0
>
> root at frontend:~# vzctl enter 2
> entered into VE 2
> root at none-test:/# mount
> simfs on / type simfs (rw,relatime)
> proc on /proc type proc (rw,nosuid,nodev,noexec)
> sysfs on /sys type sysfs (rw,nosuid,nodev,noexec)
> tmpfs on /var/run type tmpfs (rw,nosuid,nodev,noexec)
> tmpfs on /var/lock type tmpfs (rw,nosuid,nodev,noexec)
> simfs on /dev/.static/dev type simfs (rw,relatime)
> udev on /dev type tmpfs (rw,relatime)
> tmpfs on /dev/shm type tmpfs (rw,relatime)
> devpts on /dev/pts type devpts (rw,relatime)
> root at none-test:/#
>
> root at frontend:~# vzctl --version
> vzctl version 3.0.22
>
> root at frontend:~# cat /proc/vz/version
> ovz005
>
> All the best,
>
> Samuel
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