I get every 5 mins this weired message in syslog :

Aug 14 22:21:23 thinkpad kernel: [196063.428060] vnstat[25360] general protection ip:40cbdc sp:7fffaafe21d0 error:0 in vnstat[400000+13000]
I have no idea of what it is and could not find any info so far.

Does anyone know what it could be ?

Thanks in advance.