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: <E7E02C14-B037-41CB-B814-5C404731DAA2@flyingcircus.io>
Date: Tue, 1 Oct 2024 09:54:56 +0200
From: Christian Theune <ct@...ingcircus.io>
To: Chris Mason <clm@...a.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 Dave Chinner <david@...morbit.com>,
 Matthew Wilcox <willy@...radead.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>,
 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 1. Oct 2024, at 02:56, Chris Mason <clm@...a.com> wrote:
> 
> I've attached a minimal version of a script we use here to show all the
> D state processes, it might help explain things.  The only problem is
> you have to actually ssh to the box and run it when you're stuck.

Thanks, I’ll dig into this next week when I’m back from vacation.

I can set up alerts when this happens and hope that I’ll be fast enough as the situation does seem to resolve itselve at some point. It’s happened quite a bit in the fleet so I guess I should be able to catch it.

Christian

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