net: add more debug info in skb_checksum_help()

This is a followup of previous patch.

Dumping the stack trace is a good start, but printing
basic skb information is probably better.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 918548c..91b7e77 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3266,15 +3266,17 @@ int skb_checksum_help(struct sk_buff *skb)
 
        offset = skb_checksum_start_offset(skb);
        ret = -EINVAL;
-       if (WARN_ON_ONCE(offset >= skb_headlen(skb)))
+       if (WARN_ON_ONCE(offset >= skb_headlen(skb))) {
+               DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
                goto out;
-
+       }
        csum = skb_checksum(skb, offset, skb->len - offset, 0);
 
        offset += skb->csum_offset;
-       if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb)))
+       if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb))) {
+               DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
                goto out;
-
+       }
        ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
        if (ret)
                goto out;