> tcp_gso_segment() makes sure that the headers are reachable in the linear > area with the pskb_may_pull(skb, sizeof(*th)) call, and gso_make_checksum() > is only working with the area up to SKB_GSO_CB()->csum_start which should > be within this area for sure. > Seems likely that csum_start is not properly initialized in this path. I am thinking that this may have happened in GRO path on a checksum error where CHECKSUM_PARTIAL (and hence csum) is not set. That would explain the infrequency of the occurrence, and also previously not setting csum would have just resulted in sending a corrupted packet not a crash.
> Well, that's the precondition we seem to be relying upon, I suppose an > assert is in order. Assert on SKB_GSO_CB()->csum_start == 0 would confirm my suspicion. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
