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

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Date:   Wed, 26 Jun 2019 22:37:56 +0200
From:   Florian Westphal <fw@...len.de>
To:     Ran Rozenstein <ranro@...lanox.com>
Cc:     Florian Westphal <fw@...len.de>,
        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

Ran Rozenstein <ranro@...lanox.com> wrote:
> 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.

I tried this without success:

DEV=dummy0
for j in $(seq 2 254);do
  for i in $(seq 2 254);do
    IP="10.$((RANDOM%254)).$((RANDOM%254)).$i"
    ip -f inet addr add $IP/16 brd + dev $DEV
    ifconfig $DEV $IP netmask 255.255.0.0
  done
done

I'll let this loop overnight, but so far nothing turned up in
dmesg (lockdep/kasan kernel).