netdev - Re: VRF and/or cgroups problem on Fedora-30, 5.2.21+ kernel

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Message-ID: <850a6d4e-3a67-a389-04a0-87032e0683d8@gmail.com>
Date:   Fri, 22 Nov 2019 17:06:59 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: VRF and/or cgroups problem on Fedora-30, 5.2.21+ kernel

On 11/22/19 5:03 PM, Ben Greear wrote:
> Hello,
> 
> We see a problem on a particular system when trying to run 'ip vrf exec
> _vrf1 ping 1.1.1.1'.
> This system reproduces the problem all the time, but other systems with
> exact same (as far as
> we can tell) software may fail occasionally, but then it will work again.
> 
> Here is an strace output.  I changed to the
> "/sys/fs/cgroup/unified/user.slice/user-1000.slice/session-2.scope/vrf/_vrf1"
> 
> directory as root user, and could view the files in that directory, so
> I'm not sure why the strace shows error 5.
> 
> Any idea what could be the problem and/or how to fix it or debug further?
> 
> 
> This command was run as root user.

check 'ulimit -l'. BPF is used to set the VRF and it requires locked memory.