linux-kernel - Re: next: arm64: LTP sendto01 test causes system crash in ilp32 mode

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Date:   Wed, 11 Oct 2017 11:48:37 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>
Subject: Re: next: arm64: LTP sendto01 test causes system crash in ilp32 mode

On Wed, 2017-10-11 at 11:41 -0700, Eric Dumazet wrote:
> On Wed, 2017-10-11 at 21:35 +0300, Yury Norov wrote:
> > Hi all, 
> > 
> > It seems like next-20171009 with ilp32 patches crashes on LTP sendto01 test
> > in sys_sendto() path, like this:
> 
> Thanks for the report.
> Probably caused by one of my recent patches, so I am taking a look.

Yes, this was silly.

Please test this fix :

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5a95e5886b55e03e4a8bfeac3506c657a4f97dde..15163454174babdcb465904f725b919268dd1bc7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1712,6 +1712,7 @@ static inline void tcp_insert_write_queue_before(struct sk_buff *new,
 
 static inline void tcp_unlink_write_queue(struct sk_buff *skb, struct sock *sk)
 {
+	tcp_skb_tsorted_anchor_cleanup(skb);
 	__skb_unlink(skb, &sk->sk_write_queue);
 }