openvz: Oops in ext4 when VPS starts

[Drunkard Zhang]

I run into a oops when mirgate /vz directory to ext4 lvm under gentoo + openvz.
ipv6 ~ # df -T
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/sda2     ext3    9.9G  4.3G  5.1G  46% /
udev         tmpfs     10M  112K  9.9M   2% /dev
/dev/sda1     ext3    198M   34M  155M  18% /boot
/dev/mapper/gwbn-lvz
              ext4     40G  2.2G   36G   6% /vz
shm          tmpfs    3.9G     0  3.9G   0% /dev/shm

And when this happens, vzctl will hang up; mount and unmount of /vz hangs too.

The word "ipv6" in console-output is just a hostname.

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