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: <9256DE36-5885-41F3-B5C7-ED6BA286E063@flyingcircus.io>
Date: Tue, 17 Sep 2024 12:11:37 +0200
From: Christian Theune <ct@...ingcircus.io>
To: Matthew Wilcox <willy@...radead.org>
Cc: Chris Mason <clm@...a.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Dave Chinner <david@...morbit.com>,
 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>,
 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 17. Sep 2024, at 11:32, Matthew Wilcox <willy@...radead.org> wrote:
> 
> On Mon, Sep 16, 2024 at 10:47:10AM +0200, Chris Mason wrote:
>> I've got a bunch of assertions around incorrect folio->mapping and I'm
>> trying to bash on the ENOMEM for readahead case.  There's a GFP_NOWARN
>> on those, and our systems do run pretty short on ram, so it feels right
>> at least.  We'll see.
> 
> I've been running with some variant of this patch the whole way across
> the Atlantic, and not hit any problems.  But maybe with the right
> workload ...?

I can start running my non-prod machines that were affected previously. I’d run this on top of 6.11?

Christian

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