Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Sender: Minchan Kim <minchan.kim@gmail.com>
Date:   Thu, 10 Nov 2022 15:04:40 -0800
From:   Minchan Kim <minchan@kernel.org>
To:     Petr Vorel <pvorel@suse.cz>
Cc:     ltp@lists.linux.it, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        Nitin Gupta <ngupta@vflare.org>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Jens Axboe <axboe@kernel.dk>,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
        Martin Doucha <mdoucha@suse.cz>,
        Yang Xu <xuyang2018.jy@fujitsu.com>
Subject: Re: [PATCH 0/1] Possible bug in zram on ppc64le on vfat
Message-ID: <Y22DiF5Q5EDUIrZE@google.com>
References: <20221107191136.18048-1-pvorel@suse.cz>
 <Y2l3vJb1y2Jynf50@google.com>
 <Y2l89dt/t8M6+9go@pevik>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Y2l89dt/t8M6+9go@pevik>
Precedence: bulk

On Mon, Nov 07, 2022 at 10:47:33PM +0100, Petr Vorel wrote:
> Hi Minchan,
> 
> > On Mon, Nov 07, 2022 at 08:11:35PM +0100, Petr Vorel wrote:
> > > Hi all,
> 
> > > following bug is trying to workaround an error on ppc64le, where
> > > zram01.sh LTP test (there is also kernel selftest
> > > tools/testing/selftests/zram/zram01.sh, but LTP test got further
> > > updates) has often mem_used_total 0 although zram is already filled.
> 
> > Hi, Petr,
> 
> > Is it happening on only ppc64le?
> I haven't seen it on other archs (x86_64, aarch64).
> 
> > Is it a new regression? What kernel version did you use?
> Found on openSUSE kernel, which uses stable kernel releases 6.0.x.
> It's probably much older, first I've seen it some years ago (I'm not able to find kernel version), but it was random. Now it's much more common.
> 
> Test runs on VM (I can give qemu command or whatever you need to know about it)
> I'll try to verify it on some bare metal ppc64le.

Hi Petr and Martin,

Thanks for testing and meaning information.

Could you tell how I could create VM to run ppc64le and run the test?
I'd like to reproduce in my local to debug it.

Thanks!