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Date:   Fri, 4 Dec 2020 20:27:53 +0100
From:   Corentin Labbe <clabbe.montjoie@gmail.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     herbert@gondor.apana.org.au, mripard@kernel.org, wens@csie.org,
        linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org,
        linux-kernel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        linux-mm@kvack.org, Andrew Morton <akpm@linuxfoundation.org>
Subject: Re: crypto: sun4i-ss: error with kmap
Message-ID: <20201204192753.GA19782@Red>
References: <20201201135252.GA9584@Red>
 <87y2ihfw6z.fsf@nanos.tec.linutronix.de>
 <20201201144529.GA6786@Red>
 <87v9dlfthf.fsf@nanos.tec.linutronix.de>
 <20201202195501.GA29296@Red>
 <877dpzexfr.fsf@nanos.tec.linutronix.de>
 <20201203173846.GA16207@Red>
 <87r1o6bh1u.fsf@nanos.tec.linutronix.de>
 <20201204132631.GA25321@Red>
 <874kl1bod0.fsf@nanos.tec.linutronix.de>
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On Fri, Dec 04, 2020 at 04:08:27PM +0100, Thomas Gleixner wrote:
> On Fri, Dec 04 2020 at 14:26, Corentin Labbe wrote:
> > On Fri, Dec 04, 2020 at 12:34:05AM +0100, Thomas Gleixner wrote:
> >> The unmap comes from sg_miter_stop() and looking at the previous
> >> map/unmap cycles there are never nested maps.
> >> 
> >> [  996.943030] cryptset-316       0d..4 73943317us : __kmap_local_pfn_prot: kmap_local_pfn: 1 ffefd000
> >> 
> >> is the first event which allocates a nested map. 
> >> 
> >> So something goes south either in sg_miter or in the crypto maze.
> >> 
> >> Enabling CONFIG_DEBUG_KMAP_LOCAL and function tracing might give us more clue.
> >
> > Done, http://kernel.montjoie.ovh/130466.log
> 
> Does not provide more information with the debug enabled. So can you
> please enable CONFIG_FUNCTION_TRACER and add 'ftrace=function' to the
> command line?
> 

Done, http://kernel.montjoie.ovh/130490.log