netdev - RE: [PATCH net-next 0/2] net: ipv4: remove erroneous advancement of list pointer

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Message-ID: <AM4PR0501MB2769CE8DC11EE4A076B62CCCC5E20@AM4PR0501MB2769.eurprd05.prod.outlook.com>
Date:   Wed, 26 Jun 2019 12:48:44 +0000
From:   Ran Rozenstein <ranro@...lanox.com>
To:     Florian Westphal <fw@...len.de>
CC:     Tariq Toukan <tariqt@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Maor Gottlieb <maorg@...lanox.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>
Subject: RE: [PATCH net-next 0/2] net: ipv4: remove erroneous advancement of
 list pointer



> -----Original Message-----
> From: Florian Westphal [mailto:fw@...len.de]
> Sent: Tuesday, June 25, 2019 12:19
> To: Ran Rozenstein <ranro@...lanox.com>
> Cc: Tariq Toukan <tariqt@...lanox.com>; Florian Westphal <fw@...len.de>;
> netdev@...r.kernel.org; Maor Gottlieb <maorg@...lanox.com>;
> edumazet@...gle.com
> Subject: Re: [PATCH net-next 0/2] net: ipv4: remove erroneous
> advancement of list pointer
> 
> Ran Rozenstein <ranro@...lanox.com> wrote:
> > > On 6/17/2019 5:02 PM, Florian Westphal wrote:
> > > > Tariq reported a soft lockup on net-next that Mellanox was able to
> > > > bisect to 2638eb8b50cf ("net: ipv4: provide __rcu annotation for
> ifa_list").
> > > >
> > > > While reviewing above patch I found a regression when addresses
> > > > have a lifetime specified.
> > > >
> > > > Second patch extends rtnetlink.sh to trigger crash (without first
> > > > patch applied).
> > > >
> > >
> > > Thanks Florian.
> > >
> > > Ran, can you please test?
> >
> > Tested, still reproduce.
> 
> Can you be a little more specific? Is there any reproducer?

The test dose stress on the interface by running this 2 commands in loop:

command is: /sbin/ip -f inet addr add $IP/16 brd + dev ens8f1
command is: ifconfig ens8f1 $IP netmask 255.255.0.0

when $IP change every iteration.

It execute every second when we see the reproduce somewhere between 40 to 200 seconds of execution.

Thanks,
Ran