Backups fail : ERROR: can't aquire lock '/var/run/vzdump.lock'

Hello ,
backups are not working anymore ( storage are not full! )
I 've got this error:
INFO: trying to get global lock - waiting...
ERROR: can't aquire lock '/var/run/vzdump.lock' - got timeout

Any idea?


pveversion -v
proxmox-ve-2.6.32: 3.4-171 (running kernel: 2.6.32-37-pve)
pve-manager: 3.4-11 (running version: 3.4-11/6502936f)
pve-kernel-2.6.32-44-pve: 2.6.32-171
pve-kernel-2.6.32-24-pve: 2.6.32-111
pve-kernel-2.6.32-37-pve: 2.6.32-150
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4...

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