linux-kernel - Re: [f2fs-dev] Writes stoped working on f2fs after the compression support was added

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Message-ID: <20200311103309.m52hdut7mt7crt7g@core.my.home>
Date:   Wed, 11 Mar 2020 11:33:09 +0100
From:   Ondřej Jirman <megi@....cz>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] Writes stoped working on f2fs after the compression
 support was added

Hello,

On Wed, Mar 11, 2020 at 05:02:10PM +0800, Chao Yu wrote:
> Hi,
> 
> Sorry for the delay.
> 
> On 2020/3/6 20:02, Ondřej Jirman wrote:
> > Hello,
> > 
> > On Thu, Feb 27, 2020 at 10:01:50AM +0800, Chao Yu wrote:
> >> On 2020/2/27 2:05, Ondřej Jirman wrote:
> >>>
> >>> No issue after 7h uptime either. So I guess this patch solved it for some
> >>> reason.
> >>
> >> I hope so as well, I will send a formal patch for this.
> > 
> > So I had it happen again, even with the patches. This time in f2fs_rename2:
> 
> Oops, it looks previous fix patch just cover the root cause... :(
> 
> Did this issue still happen frequently? If it is, would you please apply patch
> that prints log during down/up semaphore.

Not frequently. Just once. I couldn't afford FS corruption during update,
so I reverted the compression support shortly after.

But I wasn't stressing the system much with FS activity after applying the
initial fix.

> And once we revert compression support patch, this issue will disappear, right?

Yes, AFAIK. I reverted it and run a few cycles of install 500MiB worth of
packages, uninstall the packages with pacman. And it didn't re-occur. I never
saw any issues with compression support patch reverted.

> Btw, did you try other hardware which is not Arm v7?

Yes, but I didn't ever see it on anything else. Just on two 8 core cortexes A7.
(2 clusters)

regards,
	o.