From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] IP: Increment INADDRERRORS if routing for a packet is
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Date: Wed, 02 Jun 2010 10:31:02 -0700 (PDT)
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Just in case people are really so clueless as to be unable to figure
this out:

echo 1 >/sys/kernel/debug/tracing/events/skb/kfree_skb/enable
...do some stuff...
cat /sys/kernel/debug/tracing/trace

You can even trace it using 'perf' by passing "skb:kfree_skb"
as the event specifier.