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

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Message-ID: <20201204132631.GA25321@Red>
Date:   Fri, 4 Dec 2020 14:26:31 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
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 12:34:05AM +0100, Thomas Gleixner wrote:
> On Thu, Dec 03 2020 at 18:38, Corentin Labbe wrote:
> > On Wed, Dec 02, 2020 at 09:59:36PM +0100, Thomas Gleixner wrote:
> >> On Wed, Dec 02 2020 at 20:55, Corentin Labbe wrote:
> >> > On Tue, Dec 01, 2020 at 04:15:08PM +0100, Thomas Gleixner wrote:
> >> >
> >> > The result could be seen at http://kernel.montjoie.ovh/129768.log
> >> > The log is 9Mb, but the ftrace dump seems not terminated, tell me if you need more.
> >> 
> >> Correct, the interesting entries right before the crash are missing. Can
> >> you try to make the trace buffers smaller or wait longer before
> >> terminating the thing?
> >> 
> >> 16k buffer size per CPU should be completely sufficient. That should
> >> give us roughly the last 100 entries per CPU.
> >> 
> >> 'trace_buf_size=16k'
> >> 
> >> is the command line option for that.
> >
> > I have set a longer timeout and now the job end with the crash:
> > http://kernel.montjoie.ovh/130094.log
> 
> Ok. So here is the problem:
> 
> [  996.933980] cryptset-316       0d..3 73943313us : __kmap_local_pfn_prot: kmap_local_pfn: 0 ffefe000
> [  996.943030] cryptset-316       0d..4 73943317us : __kmap_local_pfn_prot: kmap_local_pfn: 1 ffefd000
> [  996.952080] cryptset-316       0d..4 73943419us : kunmap_local_indexed: kunmap_local: 1 ffefe000
> 
> There are two maps:
> 
>    1) index 0 vaddr 0xffefe000
>    2) index 1 vaddr 0xffefd000
> 
> Now comes the unmap and unmaps 0xffefe000 which is the first map and not
> the second one. -> Fail
> 
> [   74.017103] [<c0251824>] (kunmap_local_indexed) from [<c046ca58>] (sg_miter_stop+0xb4/0x164)
> [   74.025535] [<c046ca58>] (sg_miter_stop) from [<c046cef4>] (sg_miter_next+0xc/0xe4)
> [   74.033191] [<c046cef4>] (sg_miter_next) from [<c075f5dc>] (sun4i_ss_opti_poll+0x278/0x40c)
> [   74.041539] [<c075f5dc>] (sun4i_ss_opti_poll) from [<c075fc64>] (sun4i_ss_cipher_poll+0x4f4/0x5e4)
> [   74.050497] [<c075fc64>] (sun4i_ss_cipher_poll) from [<c0421394>] (crypto_skcipher_encrypt+0x38/0x5c)
> [   74.059713] [<c0421394>] (crypto_skcipher_encrypt) from [<c0432ba0>] (xts_encrypt+0x8c/0xd4)
> [   74.068146] [<c0432ba0>] (xts_encrypt) from [<c0421394>] (crypto_skcipher_encrypt+0x38/0x5c)
> [   74.076581] [<c0421394>] (crypto_skcipher_encrypt) from [<c043bfd4>] (skcipher_recvmsg+0x364/0x43c)
> [   74.085625] [<c043bfd4>] (skcipher_recvmsg) from [<c07c8da0>] (sock_read_iter+0xa8/0xf8)
> [   74.093713] [<c07c8da0>] (sock_read_iter) from [<c028ce94>] (vfs_read+0x2b8/0x2d8)
> [   74.101279] [<c028ce94>] (vfs_read) from [<c028d394>] (ksys_read+0xb0/0xe4)
> [   74.108237] [<c028d394>] (ksys_read) from [<c0100060>] (ret_fast_syscall+0x0/0x58)
> 
> 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