netdev - Re: [PATCH net] ipv6: fix the check before getting the cookie in rt6_get

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Date:   Thu, 6 Jun 2019 16:44:47 -0600
From:   David Ahern <dsahern@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>
Subject: Re: [PATCH net] ipv6: fix the check before getting the cookie in
 rt6_get_cookie

On 6/6/19 10:10 AM, Xin Long wrote:
> On Thu, Jun 6, 2019 at 11:35 PM David Ahern <dsahern@...il.com> wrote:
>>
>> On 6/2/19 5:10 AM, Xin Long wrote:
>>> In Jianlin's testing, netperf was broken with 'Connection reset by peer',
>>> as the cookie check failed in rt6_check() and ip6_dst_check() always
>>> returned NULL.
>>
>> Any particular test or setup that is causing the reset? I do not see
>> that problem in general.
>>
> by running the script below, netperf ends up with:
> 
> Connection reset by peer
> netperf: remote error 104
> 

No luck reproducing on 5.1 or 5.2. I get the theory though - resetting
the mtu to change exceptions. Interesting test case to add under selftests