linux-kernel - Re: [PATCH v4 05/11] mm: do not split a folio if it has minimum folio order requirement

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Date: Fri, 26 Apr 2024 16:46:11 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>, djwong@...nel.org,
	brauner@...nel.org, david@...morbit.com, chandan.babu@...cle.com,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	hare@...e.de, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-xfs@...r.kernel.org, gost.dev@...sung.com,
	p.raghav@...sung.com
Subject: Re: [PATCH v4 05/11] mm: do not split a folio if it has minimum
 folio order requirement

On Thu, Apr 25, 2024 at 05:47:28PM -0700, Luis Chamberlain wrote:
> On Thu, Apr 25, 2024 at 09:10:16PM +0100, Matthew Wilcox wrote:
> > On Thu, Apr 25, 2024 at 01:37:40PM +0200, Pankaj Raghav (Samsung) wrote:
> > > From: Pankaj Raghav <p.raghav@...sung.com>
> > > 
> > > using that API for LBS is resulting in an NULL ptr dereference
> > > error in the writeback path [1].
> > >
> > > [1] https://gist.github.com/mcgrof/d12f586ec6ebe32b2472b5d634c397df
> > 
> >  How would I go about reproducing this?
> 
> Using kdevops this is easy:
> 
> make defconfig-lbs-xfs-small -j $(nproc)
> make -j $(nproc)

I forgot after the above:

make bringup

> make fstests
> make linux
> make fstests-baseline TESTS=generic/447 COUNT=10
> tail -f guestfs/*-xfs-reflink-16k-4ks/console.log

The above tail command needs sudo prefix for now too.

> or
> sudo virsh list
> sudo virsh console ${foo}-xfs-reflink-16k-4ks
> 
> Where $foo is the value of CONFIG_KDEVOPS_HOSTS_PREFIX in .config for
> your kdevops run.
>
> I didn't have time to verify if the above commands for kdevops worked

I did now, I forgot to git push commits to kdevops yesterday but I
confirm the above steps can be used to repdroduce this issue now.

  Luis