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

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Message-ID: <1476338524.4904.1.camel@sipsolutions.net>
Date:   Thu, 13 Oct 2016 08:02:04 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Wireless List <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)

On Wed, 2016-10-12 at 22:39 -0700, Andy Lutomirski wrote:

> In a pinch, I have these patches sitting around:
> 
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=0a39cfa6fbb5d5635c85253cc7d6b44b54822afd
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=bf8cfa200b5a01383ea39fc8ce2f32909767baa8

That truly sounds like something we'd rather avoid in the TX/RX paths
though, which should perform well.

> I don't like them, though.  I think it's rather silly that we can't
> just pass virtual addresses to the crypto code.

I don't really understand it either, hence my question about the actual
crash. I'll try to reproduce it in a VM.

johannes