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Fri, 04 Dec 2020 05:26:35 -0800 (PST) Received: from Red ([2a01:cb1d:3d5:a100:264b:feff:fe03:2806]) by smtp.googlemail.com with ESMTPSA id q1sm3576353wrj.8.2020.12.04.05.26.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Dec 2020 05:26:34 -0800 (PST) Date: Fri, 4 Dec 2020 14:26:31 +0100 From: Corentin Labbe To: Thomas Gleixner 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 , linux-mm@kvack.org, Andrew Morton Subject: Re: crypto: sun4i-ss: error with kmap Message-ID: <20201204132631.GA25321@Red> References: <20201201130102.GA23461@Red> <87ft4phcyx.fsf@nanos.tec.linutronix.de> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87r1o6bh1u.fsf@nanos.tec.linutronix.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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] [] (kunmap_local_indexed) from [] (sg_miter_stop+0xb4/0x164) > [ 74.025535] [] (sg_miter_stop) from [] (sg_miter_next+0xc/0xe4) > [ 74.033191] [] (sg_miter_next) from [] (sun4i_ss_opti_poll+0x278/0x40c) > [ 74.041539] [] (sun4i_ss_opti_poll) from [] (sun4i_ss_cipher_poll+0x4f4/0x5e4) > [ 74.050497] [] (sun4i_ss_cipher_poll) from [] (crypto_skcipher_encrypt+0x38/0x5c) > [ 74.059713] [] (crypto_skcipher_encrypt) from [] (xts_encrypt+0x8c/0xd4) > [ 74.068146] [] (xts_encrypt) from [] (crypto_skcipher_encrypt+0x38/0x5c) > [ 74.076581] [] (crypto_skcipher_encrypt) from [] (skcipher_recvmsg+0x364/0x43c) > [ 74.085625] [] (skcipher_recvmsg) from [] (sock_read_iter+0xa8/0xf8) > [ 74.093713] [] (sock_read_iter) from [] (vfs_read+0x2b8/0x2d8) > [ 74.101279] [] (vfs_read) from [] (ksys_read+0xb0/0xe4) > [ 74.108237] [] (ksys_read) from [] (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