netdev - Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)

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Date:   Fri, 14 Oct 2016 17:39:57 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Andy Lutomirski <luto@...capital.net>,
        Johannes Berg <johannes@...solutions.net>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Wireless List <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)

On (10/13/16 14:49), Andy Lutomirski wrote:
[..]
> > >  FAIL: 00004100002cba02 > ffffc900802cba02 || 1 -> (00004100002cba02
> > > >> 39) == 130
> >
> > Yeah, we already know that in this function the aad variable is on the
> > stack, it explicitly is.
> >
> > The question, though, is why precisely that fails in the crypto code.
> > Can you send the Oops report itself?
> >
> 
> It's failing before that.  With CONFIG_VMAP_STACK=y, the stack may not
> be physically contiguous and can't be used for DMA, so putting it in a
> scatterlist is bogus in general, and the crypto code mostly wants a
> scatterlist.
> 
> There are a couple (faster!) APIs for crypto that don't use
> scatterlists, but I don't think AEAD works with them.

given that we have a known issue shouldn't VMAP_STACK be
disabled for now, or would you rather prefer to mark MAC80211
as incompatible: "depends on CFG80211 && !VMAP_STACK"?

	-ss