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Date:   Tue, 1 Dec 2020 14:52:52 +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
Subject: Re: crypto: sun4i-ss: error with kmap
Message-ID: <20201201135252.GA9584@Red>
References: <20201201130102.GA23461@Red>
 <87ft4phcyx.fsf@nanos.tec.linutronix.de>
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On Tue, Dec 01, 2020 at 02:28:54PM +0100, Thomas Gleixner wrote:
> On Tue, Dec 01 2020 at 14:01, Corentin Labbe wrote:
> > +[  213.050152] ------------[ cut here ]------------
> > +[  213.050207] WARNING: CPU: 0 PID: 18430 at mm/highmem.c:581 kunmap_local_indexed+0x194/0x1d4
> > +[  213.050214] Modules linked in: sm4_generic authenc vmac xcbc hmac streebog_generic sm3_generic sha3_generic crct10dif_generic crct10dif_common seed rmd320 rmd256 rmd160 rmd128 cts lzo lzo_compress salsa20_generic camellia_generic fcrypt pcbc tgr192 anubis wp512 khazad tea michael_mic arc4 cast6_generic cast5_generic cast_common deflate zlib_deflate sha512_generic cfb ofb serpent_generic lrw twofish_generic twofish_common blowfish_generic blowfish_common md4
> > +[  213.050410] CPU: 0 PID: 18430 Comm: cryptsetup Not tainted 5.10.0-rc5-next-20201130-00059-gf7ecf0611042-dirty #242
> > +[  213.050416] Hardware name: Allwinner sun7i (A20) Family
> > +[  213.050448] [<c010d730>] (unwind_backtrace) from [<c010a218>] (show_stack+0x10/0x14)
> > +[  213.050465] [<c010a218>] (show_stack) from [<c08bbdcc>] (dump_stack+0x98/0xac)
> > +[  213.050479] [<c08bbdcc>] (dump_stack) from [<c08b93ac>] (__warn+0xc0/0xd8)
> > +[  213.050491] [<c08b93ac>] (__warn) from [<c08b9428>] (warn_slowpath_fmt+0x64/0xc0)
> > +[  213.050505] [<c08b9428>] (warn_slowpath_fmt) from [<c02018b4>] (kunmap_local_indexed+0x194/0x1d4)
> > +[  213.050525] [<c02018b4>] (kunmap_local_indexed) from [<c03e0390>] (sg_miter_stop+0xb4/0x164)
> > +[  213.050541] [<c03e0390>] (sg_miter_stop) from [<c03e082c>] (sg_miter_next+0xc/0xe4)
> > +[  213.050560] [<c03e082c>] (sg_miter_next) from [<c06b2d04>] (sun4i_ss_opti_poll+0x278/0x40c)
> > +[  213.050575] [<c06b2d04>] (sun4i_ss_opti_poll) from [<c06b338c>] (sun4i_ss_cipher_poll+0x4f4/0x5e4)
> > +[  213.050590] [<c06b338c>] (sun4i_ss_cipher_poll) from [<c03991d4>] (crypto_skcipher_encrypt+0x38/0x5c)
> > +[  213.050604] [<c03991d4>] (crypto_skcipher_encrypt) from [<c03aa980>] (xts_encrypt+0x8c/0xd4)
> > +[  213.050617] [<c03aa980>] (xts_encrypt) from [<c03991d4>] (crypto_skcipher_encrypt+0x38/0x5c)
> > +[  213.050631] [<c03991d4>] (crypto_skcipher_encrypt) from [<c03b3d94>] (skcipher_recvmsg+0x364/0x43c)
> > +[  213.050646] [<c03b3d94>] (skcipher_recvmsg) from [<c0719650>] (sock_read_iter+0xa8/0xf8)
> > +[  213.050663] [<c0719650>] (sock_read_iter) from [<c0239e98>] (vfs_read+0x2b8/0x2d8)
> > +[  213.050676] [<c0239e98>] (vfs_read) from [<c023a398>] (ksys_read+0xb0/0xe4)
> > +[  213.050688] [<c023a398>] (ksys_read) from [<c0100060>] (ret_fast_syscall+0x0/0x58)
> > +[  213.050695] Exception stack(0xc4d13fa8 to 0xc4d13ff0)
> > +[  213.050707] 3fa0:                   00000006 b6f084d0 00000006 b47ff000 00010000 00000000
> > +[  213.050718] 3fc0: 00000006 b6f084d0 00010000 00000003 00000030 beb6e9bc 00000010 beb6e9fc
> > +[  213.050727] 3fe0: b6e3609c beb6e958 b6cc8504 b6cc851c
> > +[  213.050735] ---[ end trace 915906e6b0e8a55d ]---
> 
> Hmm. No registers there. Can you apply the patch below so we can see the
> address?
> 
> Thanks,
> 
>         tglx
> ---
> diff --git a/mm/highmem.c b/mm/highmem.c
> index b49364a306b8..240fc6e5bfb4 100644
> --- a/mm/highmem.c
> +++ b/mm/highmem.c
> @@ -571,8 +571,10 @@ void kunmap_local_indexed(void *vaddr)
>  		 * PAGE_OFFSET. Warn for all other addresses which are in
>  		 * the user space part of the virtual address space.
>  		 */
> -		if (!kmap_high_unmap_local(addr))
> +		if (!kmap_high_unmap_local(addr)) {
> +			pr_err("kunmap_local: vaddr %lx\n", (unsigned long) vaddr);
>  			WARN_ON_ONCE(addr < PAGE_OFFSET);
> +		}
>  		return;
>  	}
>  

The patch made the board too busy logging and fail to boot until the test.

Regards