linux-kernel - Re: [PATCH] btrfs: parent bytenr must be aligned to sector size

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Message-ID: <20230428164425.GD2654@twin.jikos.cz>
Date:   Fri, 28 Apr 2023 18:44:25 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Qu Wenruo <wqu@...e.com>
Cc:     Анастасия Белова 
        <abelova@...ralinux.ru>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] btrfs: parent bytenr must be aligned to sector size

On Wed, Apr 26, 2023 at 08:25:14PM +0800, Qu Wenruo wrote:
> 
> 
> On 2023/4/26 19:53, Анастасия Белова wrote:
> > From: Anastasia Belova <abelova@...ralinux.ru>
> > 
> > Change nodesize to sectorsize in alignment check
> > in print_extent_item. Change requirement in comment.
> > 
> > Found by Linux Verification Center (linuxtesting.org) with SVACE.
> > 
> > Fixes: ea57788eb76d ("btrfs: require only sector size alignment for parent eb bytenr")
> > Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
> 
> Reviewed-by: Qu Wenruo <wqu@...e.com>
> 
> A little surprised that a static checker can even find such hidden problem.

I've seen in Coverity a fuzzy report like "there are 8 cases that do
thing X and this one does not, is it expected?" which is basically just
pattern matching but can be caused by copy&paste mistakes.