netdev - Re: Repeatable inet6_dump_fib crash in stock 4.12.0-rc4+

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Message-ID: <8630b942-2684-2f21-fdb9-8474aba71528@gmail.com>
Date:   Wed, 14 Jun 2017 16:25:44 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: Repeatable inet6_dump_fib crash in stock 4.12.0-rc4+

On 6/14/17 4:23 PM, Ben Greear wrote:
> On 06/13/2017 07:27 PM, David Ahern wrote:
> 
>> Let's try a targeted debug patch. See attached
> 
> I had to change it to pr_err so it would go to our serial console
> since the system locked hard on crash,
> and that appears to be enough to change the timing where we can no longer
> reproduce the problem.


ok, let's figure out which one is doing that. There are 3 debug
statements. I suspect fib6_del_route is the one setting the state to
FWS_U. Can you remove the debug prints in fib6_repair_tree and
fib6_walk_continue and try again?