netdev - Re: Waiting for vrf to become free on rmmod of bridge...

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Message-ID: <41dcc56f-9c01-450f-1be1-61bb31506f4d@candelatech.com>
Date:   Fri, 8 Feb 2019 10:12:07 -0800
From:   Ben Greear <greearb@...delatech.com>
To:     David Ahern <dsahern@...il.com>, netdev <netdev@...r.kernel.org>
Subject: Re: Waiting for vrf to become free on rmmod of bridge...

On 2/6/19 5:50 PM, David Ahern wrote:
> On 2/6/19 3:20 PM, Ben Greear wrote:
>> Hello,
>>
>> I just saw this warning on a system running a hacked 4.20.2+ kernel.
>> Any known bugs
>> of this nature in this (upstream) kernel?  The command that is blocked is:
>> 'rmmod bridge llc'
>>
>> [17069.299135] unregister_netdevice: waiting for _vrf13 to become free.
>> Usage count = 1
>> [17079.306438] unregister_netdevice: waiting for _vrf13 to become free.
>> Usage count = 1
>> [17089.314656] unregister_netdevice: waiting for _vrf13 to become free.
>> Usage count = 1
>> [17099.322870] unregister_netdevice: waiting for _vrf13 to become free.
>> Usage count = 1
>>
>> Thanks,
>> Ben
>>
> 
> No known refcount issues with vrf.
> 
> I use namespaces for testing which creates devices, adds routes, runs
> traffic and deletes the device and namespace. That series in the tests
> has been known to trigger refcount problems in the past.

I'm not using namespaces in my test, but it is fairly convoluted.  If I
figure out how to reproduce the issue I'll let you know.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com