linux-ext4 - Re: ext2/zram issue [was: Linux 5.19]

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Date:   Tue, 9 Aug 2022 11:53:48 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        minchan@...nel.org, ngupta@...are.org, Jan Kara <jack@...e.com>,
        Ted Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: ext2/zram issue [was: Linux 5.19]

On Tue, Aug 09, 2022 at 06:15:37PM +0900, Sergey Senozhatsky wrote:
> On (22/08/09 11:12), Lukas Czerner wrote:
> > Hi Jiri,
> > 
> > I've tried a quick xfstests run on ext2 on zram and I can't see any
> > issues like this so far. I will run a full test and report back in case
> > there is anything obvious.
> 
> AFAICT this should be visible only when we are under memory pressure,
> so that direct reclaim from zs_malloc handle allocation call makes a
> difference.
> 

True, I haven't seen the other email from Jiri, sorry about that. I can
confirm that under memory pressure it is in fact reproducible with
xfstests and also I can confirm that reverting
e7be8d1dd983156bbdd22c0319b71119a8fbb697 makes it go away.
But Jiri has a better repro already anyway.

Thanks!
-Lukas