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Eric Dumazet
6de1dec1c1
Michal reported and bisected an issue after recent adoption
of skb_attempt_defer_free() in UDP.
The issue here is that skb_release_head_state() is called twice per skb,
one time from skb_consume_udp(), then a second time from skb_defer_free_flush()
and napi_consume_skb().
As Sabrina suggested, remove skb_release_head_state() call from
skb_consume_udp().
Add a DEBUG_NET_WARN_ON_ONCE(skb_nfct(skb)) in skb_attempt_defer_free()
Many thanks to Michal, Sabrina, Paolo and Florian for their help.
Fixes: 6471658dc6 ("udp: use skb_attempt_defer_free()")
Reported-and-bisected-by: Michal Kubecek <[email protected]>
Closes: https://lore.kernel.org/netdev/gpjh4lrotyephiqpuldtxxizrsg6job7cvhiqrw72saz2ubs3h@g6fgbvexgl3r/
Signed-off-by: Eric Dumazet <[email protected]>
Tested-by: Michal Kubecek <[email protected]>
Cc: Sabrina Dubroca <[email protected]>
Cc: Florian Westphal <[email protected]>
Reviewed-by: Sabrina Dubroca <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>