linux-kernel - Re: Fwd: f2fs write error Linux v6.2

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Date:   Sat, 31 Dec 2022 19:57:58 +0800
From:   Jeff Chua <jeff.chua.linux@...il.com>
To:     Chao Yu <chao@...nel.org>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Eric Biggers <ebiggers@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        F2FS Development <linux-f2fs-devel@...ts.sourceforge.net>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: Re: Fwd: f2fs write error Linux v6.2

On Sat, Dec 31, 2022 at 10:51 AM Chao Yu <chao@...nel.org> wrote:
>
> Hi Jeff,
>
> On 2022/12/30 14:39, Eric Biggers wrote:
> > If you could provide the mkfs and mount options you are using, and any other
> > relevant details, that would be helpful.  Bisection would also be very helpful,
> > as Thorsten mentioned.

I was just preparing my environment so I could hit the same issue
before I go for the bisect, so I don't need to reboot every time. Got
to a point where I could just qemu kvm + initrd ramdisk with / (f2fs)
and I could hit the problem almost every 8/10 runs just by doing
"mount -o remount /" and the system would freeze. That's good. I've a
good test case! ... and then I see Chao Yu's patch ...

> Other than that, I found some cases which can cause similar issue, so I figure
> out a patch for possible fixing, if you can have a try with it to check whether
> it can fix your issue, that would be helpful as well.
>
> https://lore.kernel.org/linux-f2fs-devel/20221230154332.5082-1-chao@kernel.org/T/#u

Ok, the patch seems to fix the problem. I'll run my qemu kvm
environment a few more times before I switch the real system. Because
it's not a that I could cause a real "mount -o remount /" freeze or
"vi /etc/passwd" fault all the time,

Will feedback soon. This would a very nice year end celebration so I
could move to 6.2.0-rc1.

Thank you!

Jeff