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Date:   Sat, 27 Jan 2018 10:52:50 +0200
From:   Ido Schimmel <>
To:     Eric Dumazet <>
Cc:     Heiner Kallweit <>,
        David Miller <>,
        "" <>
Subject: Re: [PATCH net] ipv6: addrconf: break critical section in

On Fri, Jan 26, 2018 at 04:10:43PM -0800, Eric Dumazet wrote:
> From: Eric Dumazet <>
> Heiner reported a lockdep splat [1]
> This is caused by attempting GFP_KERNEL allocation while RCU lock is
> held and BH blocked.
> We believe that addrconf_verify_rtnl() could run for a long period,
> so instead of using GFP_ATOMIC here as Ido suggested, we should break
> the critical section and restart it after the allocation.


> Fixes: f3d9832e56c4 ("ipv6: addrconf: cleanup locking in ipv6_add_addr")
> Signed-off-by: Eric Dumazet <>
> Reported-by: Heiner Kallweit <>

Reviewed-by: Ido Schimmel <>


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