netdev - Re: [PATCH v2 net] inet: frags: better deal with smp races

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Date:   Thu, 08 Nov 2018 18:41:17 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        soukjin.bae@...sung.com
Subject: Re: [PATCH v2 net] inet: frags: better deal with smp races

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu,  8 Nov 2018 17:34:27 -0800

> Multiple cpus might attempt to insert a new fragment in rhashtable,
> if for example RPS is buggy, as reported by 배석진 in
> https://patchwork.ozlabs.org/patch/994601/
> 
> We use rhashtable_lookup_get_insert_key() instead of
> rhashtable_insert_fast() to let cpus losing the race
> free their own inet_frag_queue and use the one that
> was inserted by another cpu.
> 
> Fixes: 648700f76b03 ("inet: frags: use rhashtables for reassembly units")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: 배석진 <soukjin.bae@...sung.com>

Applied and queued up for -stable, thanks.