linux-kernel - Re: crypto: sun4i-ss: error with kmap

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Message-ID: <874kl1bod0.fsf@nanos.tec.linutronix.de>
Date:   Fri, 04 Dec 2020 16:08:27 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     herbert@...dor.apana.org.au, mripard@...nel.org, wens@...e.org,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        linux-mm@...ck.org, Andrew Morton <akpm@...uxfoundation.org>
Subject: Re: crypto: sun4i-ss: error with kmap

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?

Thanks,

        tglx