From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH] ipv4: initialise the itag variable in __mkroute_input
Date: Thu, 22 May 2014 11:21:29 -0700
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Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
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To: dormando <dormando@rydia.net>
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On Thu, 2014-05-22 at 11:13 -0700, dormando wrote:

> CONFIG_IP_ROUTE_CLASSID=y
> 
> There're a lot of negatives in that description, but if this patch only
> affects you if CONFIG_IP_ROUTE_CLASSID=n?

Yep


Have you tried Linus fix for pipes ?
(commit b0d8d2292160bb63de1972361ebed100c64b5b37 )