bridged networking warning skb_warn_bad_offload

[dudmuck]

With Linux x86_64 host and Linux x86_64 guest, using tcp/ip over bridged networking results in a stack trace in dmesg logs.

[dudmuck]

vbox log

[dudmuck]

stack trace from dmesg

[Frank Mehnert]

What type of network card provides the host interface eth2?

[Aleksey Ilyushin]

This happens because vboxnetflt.ko receives a GRO packet from the ixgbe driver it cannot understand and it tries to segment it with skb_gso_segment(). The ixgbe driver marks checksum as unnecessary in packet skb while skb_gso_segment() expects it to be partial. The real question is why our netfilter cannot understand the packet. Could you build VirtualBox kernel modules with debug enabled? To do it you need to go <vbox_dir>/src/vboxhost and execute the following commands while logged in as root:

/etc/init.d/vboxdrv stop
USER=aleksey make BUILD_TYPE=debug
insmod ./vboxdrv.ko
insmod ./vboxnetflt.ko
insmod ./vboxnetadp.ko

These will build and load kernel modules. <vbox_dir> is usually /opt/VirtualBox. The debug output goes into the system log (/var/log/messages, most likely). Please send the relevant part of the log to aleksey dot ilyushin at oracle dot com. Or upload it to ftp.oracle.com:/appsdev/incoming and send me the name.

[Valery Ushakov]

Any feedback? Is this still a problem?

[Frank Mehnert]

Please reopen if still relevant.