linux-kernel - Re: 6.6.8 stable: crash in folio_mark

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Date: Sun, 31 Dec 2023 16:15:53 -0500
From: Genes Lists <lists@...ience.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
  linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: 6.6.8 stable: crash in folio_mark_dirty

On Sun, 2023-12-31 at 20:59 +0000, Matthew Wilcox wrote:
> On Sat, Dec 30, 2023 at 10:23:26AM -0500, Genes Lists wrote:
> > Apologies in advance, but I cannot git bisect this since machine
> > was
> > running for 10 days on 6.6.8 before this happened.
> 
> This problem simply doesn't make sense.  There's just no way we shoud
> be
> able to get a not-uptodate folio into the page tables.  We do have
> one
> pending patch which fixes a situation in which we can get some very
> odd-looking situations due to reusing a page which has been freed.
> I appreciate your ability to reproduce this is likely nil, but if you
> could add
> 
> https://lore.kernel.org/all/20231220214715.912B4C433CA@smtp.kernel.or
> g/
> 
> to your kernel, it might make things more stable for you.
> 

Ok looks like that's in mainline - machine is now running 6.7.0-rc7 -
unless you prefer I patch 6.6.8 with above and change to that.

thanks and sorry about bringing up wacky problem.

gene