Waiting for vrf to become free on rmmod of bridge...

Waiting for vrf to become free on rmmod of bridge...

[Ben Greear]

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

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

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

[David Ahern]

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.

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

[Ben Greear]

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@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com