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Date:   Fri, 2 Sep 2022 18:23:15 +0800
From:   Herbert Xu <herbert@gondor.apana.org.au>
To:     cuigaosheng <cuigaosheng1@huawei.com>
Cc:     davem@davemloft.net, linux-crypto@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH -next 2/2] crypto: crc32c - add missing Kconfig option
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On Thu, Aug 25, 2022 at 08:55:12PM +0800, cuigaosheng wrote:
> Thanks for your reply.
> 
> While I was debugging the kernel code of linux-next, I start the kernel
> with qemu-system-arm with following commands:
> 
>     make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- vexpress_defconfig
>     make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j32
>     qemu-system-arm -M vexpress-a9 -m 1024M -s -nographic -kernel arch/arm/boot/zImage \
>                    -dtb arch/arm/boot/dts/vexpress-v2p-ca9.dtb -sd /home/rootfs.sd \
>                    -append "root=/dev/mmcblk0 rw console=ttyAMA0"
> 
> But it failed, so I tried to locate the cause of the failure and finally found that
> it failed from this patch(cad439fc040e crypto: api - Do not create test larvals if manager is disabled)，
> logs as follows:
> > EXT4-fs (mmcblk0): Cannot load crc32c driver. VFS: Cannot open root
> > device "mmcblk0" or unknown-block(179,0): error -80 Please append a
> > correct "root=" boot option; here are the available partitions: 1f00
> > 131072 mtdblock0 (driver?) 1f01 32768 mtdblock1 (driver?) b300 32768
> > mmcblk0 driver: mmcblk Kernel panic - not syncing: VFS: Unable to mount
> > root fs on unknown-block(179,0) CPU: 0 PID: 1 Comm: swapper/0 Not
> > tainted 5.15.0-rc1+ #1 Hardware name: ARM-Versatile Express [<8010f334>]
> > (unwind_backtrace) from [<8010b08c>] (show_stack+0x10/0x14) [<8010b08c>]
> > (show_stack) from [<8083f2a4>] (dump_stack_lvl+0x40/0x4c) [<8083f2a4>]
> > (dump_stack_lvl) from [<8083b210>] (panic+0xf8/0x2f4) [<8083b210>]
> > (panic) from [<80b0175c>] (mount_block_root+0x178/0x200) [<80b0175c>]
> > (mount_block_root) from [<80b01bac>] (prepare_namespace+0x150/0x18c)
> > [<80b01bac>] (prepare_namespace) from [<8084384c>]
> > (kernel_init+0x10/0x124) [<8084384c>] (kernel_init) from [<80100130>]
> > (ret_from_fork+0x14/0x24) Exception stack(0x8108bfb0 to 0x8108bff8)
> > bfa0: ???????? ???????? ???????? ???????? bfc0: ???????? ????????
> > ???????? ???????? ???????? ???????? ???????? ???????? bfe0: ????????
> > ???????? ???????? ???????? ???????? ???????? ---[ end Kernel panic - not
> > syncing: VFS: Unable to mount root fs on unknown-block(179,0) ]---
> 
> In the patch, crypto_alloc_test_larval will return NULL if CONFIG_CRYPTO_MANAGER disabled, so
> I checked to see if this change was the cause "EXT4-fs (mmcblk0): Cannot load crc32c driver
> ", the success logs does not have this error.
> 
> When I enabled CONFIG_CRYPTO_MANAGER, kernel can be boot successfully.
> 
> Could that be the reason? I would be very grateful if you could give me some advice.

Can you please provide the whole .config file?

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt