I just formated the LV with the vz root on it using ext3, and now it works fine:
/dev/mapper/md1_raid1-vz on /var/lib/vz type ext3 (rw)

No more problems:
Feb 15 09:22:08 brequinda kernel: [ 401.386985] warning: `vzctl' uses 32-bit capabilities (legacy support in use)
Feb 15 09:22:08 brequinda kernel: [ 401.412070] CT: 202: started

So the Problem clearly seems to be related to ext4 and vz, ext4 outside
vz works fine



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