linux-kernel - Re: [BUG] KCSAN: data-race in xas_clear_mark / xas_find

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Message-ID: <ZN996RyhG8K5u8i7@casper.infradead.org>
Date:   Fri, 18 Aug 2023 15:19:21 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [BUG] KCSAN: data-race in xas_clear_mark / xas_find_marked

On Fri, Aug 18, 2023 at 03:37:10PM +0200, Mirsad Todorovac wrote:
> I am new to KCSAN. I was not aware of KCSAN false positives thus far, so my best bet was to report them.
> 
> I thought that maybe READ_ONCE() was required, but I will trust your judgment.
> 
> I hope I can find this resolved.

I haven't looked into KCSAN in any detail, I don't know what the right
way is to resolve this.