linux-kernel - Re: [PATCH 14/24] init: clear root_wait on all invalid root= strings

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Date:   Wed, 21 Jun 2023 21:28:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Mike Snitzer <snitzer@...nel.org>,
        Joern Engel <joern@...ybastard.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Pavel Machek <pavel@....cz>, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 14/24] init: clear root_wait on all invalid root= strings

On 6/21/23 20:51, Christoph Hellwig wrote:
> On Wed, Jun 21, 2023 at 02:07:13PM -0700, Guenter Roeck wrote:
>> On Tue, May 23, 2023 at 09:45:25AM +0200, Christoph Hellwig wrote:
>>> Instead of only clearing root_wait in devt_from_partuuid when the UUID
>>> format was invalid, do that in parse_root_device for all strings that
>>> failed to parse.
>>>
>>> Signed-off-by: Christoph Hellwig <hch@....de>
>>
>> In linux-next, almost all of my boot tests from usb drives as well
>> as a few others fail with "Disabling rootwait; root= is invalid."
>> in the log. Bisect points to this patch.
> 
> Can you send such a log, and the command line you've used?
> 


There are lots of logs at https://kerneltests.org/builders, in the 'next'
column of qemu tests. One example is
https://kerneltests.org/builders/qemu-arm-v7-next/builds/511/steps/qemubuildcommand/logs/stdio

Sample command line:

qemu-system-arm -M mcimx7d-sabre \
      -kernel arch/arm/boot/zImage -no-reboot -snapshot \
      -usb -device usb-storage,drive=d0,bus=usb-bus.1 \
      -drive file=rootfs-armv7a.ext2,if=none,id=d0,format=raw \
      -m 256 -nic user -display none \
      --append "root=/dev/sda rootwait earlycon=ec_imx6q,mmio,0x30860000,115200n8 console=ttymxc0,115200" \
      -dtb arch/arm/boot/dts/imx7d-sdb.dtb \
      -nographic -monitor null -serial stdio

This is with a modified imx_v6_v7_defconfig and root file system from
https://github.com/groeck/linux-build-test/blob/master/rootfs/arm-v7/rootfs-armv7a.ext2.gz

The -EINVAL return value is from

	if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')

in devt_from_devname().

Guenter