netdev - Re: macvlan: Fix device ref leak when purging bc

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Message-ID: <20170424075606.GA19926@gondor.apana.org.au>
Date:   Mon, 24 Apr 2017 15:56:07 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Joe.Ghalam@...l.com
Cc:     davem@...emloft.net, Clifford.Wichmann@...l.com,
        netdev@...r.kernel.org
Subject: Re: macvlan: Fix device ref leak when purging bc_queue

On Fri, Apr 21, 2017 at 02:40:50PM +0000, Joe.Ghalam@...l.com wrote:
> That's not true. macvlan_dellink() unregisters the queue, and macvlan_process_broadcast() will never get called. Please note that I'm not speculating. I have traced enabled on the dev_put and dev_hold, and I'm reporting a real, reproducible issue.

The only thing that can stop macvlan_process_broadcast from getting
called is macvlan_port_destroy.  Nothing else can stop the work
queue, unless of course the work queue mechanism itself is broken.

So if you're sure macvlan_port_destroy is never even called in
your case, then you'll need to start debugging the kernel work
queue mechanism to see why macvlan_process_broadcast is not getting
called.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt