netdev - Re: RCU callback crashes

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Date:   Wed, 20 Dec 2017 12:17:41 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Jiri Pirko <jiri@...nulli.us>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: RCU callback crashes

On Wed, 20 Dec 2017 10:04:17 -0800, John Fastabend wrote:
> On 12/19/2017 10:34 PM, Jakub Kicinski wrote:
> > On Tue, 19 Dec 2017 22:22:27 -0800, Jakub Kicinski wrote:  
> >>>> 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...  
> > 
> > Ah, no object debug but KASAN on produces this:
> >   
> 
> @Jakub, This is with mq and pfifo_fast I guess?

Sorry for falling silent, I was convinced I saw this before your code
went in, it just takes a lot longer to trigger... I've been running
net-next from Dec 1st now for an hour now and it didn't crash :/

Trying KASAN now..