Re: [PATCH net-next v5 1/2] net: Use 16bits for *_headers fields of struct skbuff

Hi,

On Wed, May 29, 2013 at 3:54 PM, Simon Horman [off-list ref] wrote:

On Wed, May 29, 2013 at 02:46:05PM -0700, Olof Johansson wrote:

quoted

Sorry, that was not a great bug report.

So, looks like it's the removal of NET_SKBUFF_DATA_USES_OFFSET that
does it for me.

The devices I've seen it with are with asix usb-ethernet adapters (on
Tegra seaboard) and with mv643xx_eth on cubox (dove).

I'll try to get a better stacktrace out of it. Simon, maybe you can
reproduce on shmobile hardware?

Sure, I will try and reproduce it.

I did subsequently post some fixes for fallout resulting from
the patch listed below. Those changes are now net-next.
Are you seeing the crash with those patches?

The fix-up patches are:

net,ipv4,ipv6: Correct assignment of skb->network_header to skb->tail
sctp: Correct access to skb->{network,transport}_header
ipv4: Correct comparisons and calculations using skb->tail and skb-transport_header
ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header
net: Correct comparisons and calculations using skb->tail and skb-transport_header
cxgb3: Correct comparisons and calculations using skb->tail and skb-transport_header
isdn: Correct comparison of skb->tail and skb-transport_header
net: Fix build warnings after mac_header and transport_header became __u16.

Ah, no, looks like those didn't make it into the 0529 linux-next.

I've merged net-next on top and retested, and I no longer see the panics.


Thanks!


-Olof