linux-ext4 - Re: BUG in ext4_ind_remove

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Date:   Fri, 4 Mar 2022 01:38:04 +0530
From:   Ritesh Harjani <riteshh@...ux.ibm.com>
To:     Tadeusz Struk <tadeusz.struk@...aro.org>
Cc:     "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org
Subject: Re: BUG in ext4_ind_remove_space

On 22/03/03 07:37AM, Tadeusz Struk wrote:
> On 3/3/22 06:56, Ritesh Harjani wrote:
> > On 22/03/02 03:14PM, Tadeusz Struk wrote:
> > > On 2/25/22 11:19, Tadeusz Struk wrote:
> > > > > I can verify this sometime next week when I get back to it.
> > > > > But thanks for reporting the issue :)
> > > >
> > > > Next week is perfectly fine. Thanks for looking into it.
> > >
> > > Hi Ritesh,
> > > Did you have chance to look into this?
> > > If you want I can send a patch that fixes the off by 1 calculation error.
> >
> > Hi Tadeusz,
> >
> > I wanted to look at that path a bit more before sending that patch.
> > Last analysis by me was more of a cursory look at the kernel dmesg log which you
> > had shared.
> >
> > In case if you want to pursue that issue and spend time on it, then feel free to
> > do it.
> >
> > I got pulled into number of other things last week and this week. So didn't get
> > a chance to look into it yet. I hope to look into this soon (if no one else
> > picks up :))
>
> I'm not familiar with the internals of ext4 implementation so I would rather
> have someone who knows it look at it.

No problem. I am willing to look into this anyways.
btw, this issue could be seen easily with below cmd on non-extent ext4 FS.

sudo xfs_io -f -c "truncate 0x4010040c000" -c "fsync" -c "fpunch 0x1000000 0xffefffff000" testfile

-ritesh