[Bug 197861] Shutting down a VM with Kernel 4.14 will sometime hang and a reboot is the only way to recover.

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https://bugzilla.kernel.org/show_bug.cgi?id=197861

--- Comment #7 from Willem de Bruijn (willemb@xxxxxxxxxx) ---
If that fixes it, the output with this patch would be informative.

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index a95877a8ac8b..7c4ba11cb429 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -941,8 +941,14 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
        if (!num_frags)
                return 0;

-       if (skb_shared(skb) || skb_unclone(skb, gfp_mask))
+       if (skb_shared(skb)) {
+               WARN_ONCE(1, "shared skb");
                return -EINVAL;
+       }
+       if (skb_unclone(skb, gfp_mask)) {
+               WARN_ONCE(1, "cloned skb");
+               return -EINVAL;
+       }

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