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Date:   Fri, 18 Sep 2020 22:26:15 +0200
From:   Eric Dumazet <>
To:     Francesco Ruggeri <>
Cc:     LKML <>,
        netdev <>,
        Cong Wang <>,
        Taehee Yoo <>,
        Andrii Nakryiko <>,
        Jiri Pirko <>,
        Alexei Starovoitov <>,
        Jakub Kicinski <>,
        David Miller <>
Subject: Re: [PATCH v4] net: use exponential backoff in netdev_wait_allrefs

On Fri, Sep 18, 2020 at 10:19 PM Francesco Ruggeri <> wrote:
> The combination of aca_free_rcu, introduced in commit 2384d02520ff
> ("net/ipv6: Add anycast addresses to a global hashtable"), and
> fib6_info_destroy_rcu, introduced in commit 9b0a8da8c4c6 ("net/ipv6:
> respect rcu grace period before freeing fib6_info"), can result in
> an extra rcu grace period being needed when deleting an interface,
> with the result that netdev_wait_allrefs ends up hitting the msleep(250),
> which is considerably longer than the required grace period.
> This can result in long delays when deleting a large number of interfaces,
> and it can be observed with this script:
> Signed-off-by: Francesco Ruggeri <>

Reviewed-by: Eric Dumazet <>

Thanks !

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