"Can not dump container: Invalid argument"

[mo_]

Hi,

I'm experiencing a weird migration error of which I was unable to find a single mention anywhere. Goes as follows:

Nov 12 14:34:02 start live migration - suspending container
Nov 12 14:34:02 dump container state
Nov 12 14:34:02 # vzctl --skiplock chkpnt 8350 --dump --dumpfile /SAN/dump/dump.8350
Nov 12 14:34:02 Setting up checkpoint...
Nov 12 14:34:02 	join context..
Nov 12 14:34:02 	dump...
Nov 12 14:34:02 Can not dump container: Invalid argument
Nov 12 14:34:02 Error: lease lock is not supported
Nov 12 14:34:02 Error: No fd for FASYNC ext4_file_operations+0x0/0xfffffffffffffd67 [ext4]
Nov 12 14:34:02 ERROR: Failed to dump container state: Checkpointing failed
Nov 12 14:34:02 aborting phase 1 - cleanup resources
Nov 12 14:34:02 removing copied files on target node
Nov 12 14:34:03 start final cleanup
Nov 12 14:34:03 ERROR: migration aborted (duration 00:00:49): Failed to dump container state: Checkpointing failed
TASK ERROR: migration aborted

the container in question is a vanilla ubuntu 10.04 container, thats running smbd (v3) and nrpe (nagios remote thingy)
Offline migration of said container is possible.

storage.conf probably wont tell you much:

dir: SAN
path /SAN
content images,iso,vztmpl,rootdir
maxfiles 1

dir: local
path /var/lib/vz
content images,iso,vztmpl,backup,rootdir
maxfiles 0

/SAN is a FC-SAN, backups are done with NBU in case you're wondering

 

[mo_]

has anynody seen something like this ever? or can suggest a way to diagnose it further?