netdev - Re: RCU callback crashes

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Message-ID: <20171219222227.402e684a@cakuba.netronome.com>
Date:   Tue, 19 Dec 2017 22:22:27 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: RCU callback crashes

On Wed, 20 Dec 2017 07:11:18 +0100, Jiri Pirko wrote:
> Wed, Dec 20, 2017 at 02:59:21AM CET, kubakici@...pl wrote:
> >Hi!
> >
> >If I run the netdevsim test long enough on a kernel with no debugging   
> 
> Just running tools/testing/selftests/bpf/test_offload.py?

Yes, like this:

while ./linux/tools/testing/selftests/bpf/test_offload.py --log /tmp/log; do echo; done

I usually crashes after ~10 minutes on my machine.

> >I get this:  
> 
> Could you try to run it with kasan on?

I didn't manage to reproduce it with KASAN on so far :(  Even enabling
object debugging to get the second splat in my email (which is more
useful) actually makes the crash go away, I only see the warning...