linux-kernel - Re: Known and unfixed active data loss bug in MM + XFS with large folios since Dec 2021 (any kernel from 6.1 upwards)

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Message-ID: <ZughmB3uLbFAWnOa@casper.infradead.org>
Date: Mon, 16 Sep 2024 13:16:24 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Christian Theune <ct@...ingcircus.io>
Cc: Dave Chinner <david@...morbit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, linux-mm@...ck.org,
	"linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Dao <dqminh@...udflare.com>, clm@...a.com,
	regressions@...ts.linux.dev, regressions@...mhuis.info
Subject: Re: Known and unfixed active data loss bug in MM + XFS with large
 folios since Dec 2021 (any kernel from 6.1 upwards)

On Mon, Sep 16, 2024 at 09:14:45AM +0200, Christian Theune wrote:
> Also, I’m still puzzled about the one variation that seems to involve page faults and not XFS. That’s something I haven’t seen a response to yet whether this IS in fact interesting or not. 

It's not; once the page cache is corrupted, it doesn't matter whether
we go through the filesystem to get the page or not.