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>>> >>> Backports of commit 81c734dae203 "ip6_tunnel: use >>> skb_vlan_inet_prepare() in __ip6_tnl_rcv()" broke IPv6 tunnelling in >>> stable branches 5.10-6.12 inclusive. This is because the return value >>> of skb_vlan_inet_prepare() had the opposite sense (0 for error rather >>> than for success) before commit 9990ddf47d416 "net: tunnel: make >>> skb_vlan_inet_prepare() return drop reasons". >>> >>> For branches including commit c504e5c2f964 "net: skb: introduce >>> kfree_skb_reason()" etc. (i.e. 6.1 and newer) it was simple to >>> backport commit 9990ddf47d416, but for 5.10 and 5.15 that doesn't seem >>> to be practical. >> >> We have seen ltp-net failing after this LTS update on downstream kernel(UEK) >> >> mainline : v5.17-rc1 - c504e5c2f964 net: skb: >> introduce kfree_skb_reason() >> stable-5.15 : v5.15.58 - 5158e18225c0 net: skb: >> introduce kfree_skb_reason() >> >> So this is not needed for 5.15.y. > > I don't know about that test failure, but your analysis is wrong. The > dependency of the original fix was commit 9990ddf47d416 "net: tunnel: > make skb_vlan_inet_prepare() return drop reasons" which changed the > sense of skb_vlan_inet_prepare()'s return value and has not been > backported to 5.15. That in turn depended on the commit you are looking > at. Thanks a lot for explaining, We had 9990ddf47d416 for our kernels hence it reasons out why we saw failure after pulling this patch. Thanks for the help. > >> This needs to be reverted for 5.15.y, looks good for 5.10.y > [...] > > I started looking at how to fix the regression in 5.10, which does not > have a backport of commit c504e5c2f964, and did not notice that it had > been backported to 5.15. So this patch probably could be reverted and > replaced with a backport of commit 9990ddf47d416. But simply reverting > it would not be correct. > Sure maybe 5.15.y doesn't really have the LTP-net stress problem. I got confused with this part of commit message: """ > > For branches including commit c504e5c2f964 "net: skb: introduce > > kfree_skb_reason()" etc. (i.e. 6.1 and newer) it was simple to > > backport commit 9990ddf47d416, but for 5.10 and 5.15 that doesn't seem > > to be practical. """ thanks for explaining and sorry for the noise. Regards, Harshit > Ben. >