I got a lot of these when using openvpn:
I got r2845 installedCode:Mar 21 11:48:40 kernel: Call Trace:
Mar 21 11:48:40 kernel: [<80300000>] mount_block_root+0x2a8/0x338
Mar 21 11:48:40 kernel: [<c0274090>] tun_chr_aio_write+0x1c8/0x2e4 [tun]
Mar 21 11:48:40 kernel: [<80003204>] stack_done+0x20/0x40
Mar 21 11:48:40 kernel: [<80300000>] mount_block_root+0x2a8/0x338
Mar 21 11:48:41 kernel: WARNING: at net/8021q/vlan_dev.c:351 vlan_dev_hard_header()