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Date: Thu, 23 Jul 2020 17:34:15 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Herbert Xu <herbert@...dor.apana.org.au>, Eric Dumazet <eric.dumazet@...il.com> Cc: "Gong, Sishuai" <sishuai@...due.edu>, "tgraf@...g.ch" <tgraf@...g.ch>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Sousa da Fonseca, Pedro Jose" <pfonseca@...due.edu> Subject: Re: PROBLEM: potential concurrency bug in rhashtable.h On 7/23/20 5:09 PM, Herbert Xu wrote: > On Thu, Jul 23, 2020 at 03:32:05PM -0700, Eric Dumazet wrote: >> >> Thanks for the report/analysis. > > Thanks indeed. > >> READ_ONCE() should help here, can you test/submit an official patch ? > > This is basically a hand-rolled RCU access. So we should instead > use proper RCU operators if possible. Let me see what I can do. Sure, but __rht_ptr() is used with different RCU checks, I guess a that adding these lockdep conditions will make a patch more invasive.
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