linux-ext4 - Re: [PATCH V15 14/18] block: enable multipage bvecs

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Date:   Thu, 28 Feb 2019 07:29:41 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>, Omar Sandoval <osandov@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Christoph Hellwig <hch@....de>, linux-ext4@...r.kernel.org,
        Coly Li <colyli@...e.de>, linux-bcache@...r.kernel.org,
        Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V15 14/18] block: enable multipage bvecs

On Wed, Feb 27, 2019 at 08:47:09PM +0000, Jon Hunter wrote:
> 
> On 21/02/2019 08:42, Marek Szyprowski wrote:
> > Dear All,
> > 
> > On 2019-02-15 12:13, Ming Lei wrote:
> >> This patch pulls the trigger for multi-page bvecs.
> >>
> >> Reviewed-by: Omar Sandoval <osandov@...com>
> >> Signed-off-by: Ming Lei <ming.lei@...hat.com>
> > 
> > Since Linux next-20190218 I've observed problems with block layer on one
> > of my test devices (Odroid U3 with EXT4 rootfs on SD card). Bisecting
> > this issue led me to this change. This is also the first linux-next
> > release with this change merged. The issue is fully reproducible and can
> > be observed in the following kernel log:
> > 
> > sdhci: Secure Digital Host Controller Interface driver
> > sdhci: Copyright(c) Pierre Ossman
> > s3c-sdhci 12530000.sdhci: clock source 2: mmc_busclk.2 (100000000 Hz)
> > s3c-sdhci 12530000.sdhci: Got CD GPIO
> > mmc0: SDHCI controller on samsung-hsmmc [12530000.sdhci] using ADMA
> > mmc0: new high speed SDHC card at address aaaa
> > mmcblk0: mmc0:aaaa SL16G 14.8 GiB
> I have also noticed some failures when writing to an eMMC device on one
> of our Tegra boards. We have a simple eMMC write/read test and it is
> currently failing because the data written does not match the source.
> 
> I did not seem the same crash as reported here, however, in our case the
> rootfs is NFS mounted and so probably would not. However, the bisect
> points to this commit and reverting on top of -next fixes the issues.

It is sdhci, probably related with max segment size, could you test the
following patch:

https://marc.info/?l=linux-mmc&m=155128334122951&w=2

Thanks,
Ming