Re: [PATCH 1/2] block: Rework bio_for_each_segment_all()

[Phillip Lougher]

On 30/03/2023 19:59, Phillip Lougher wrote:
> On 30/03/2023 18:55, Kent Overstreet wrote:
> > On Wed, Mar 29, 2023 at 05:50:27PM +0100, Phillip Lougher wrote:
> > > There is a problem with the above code, on testing I get the following
> > > results:
> > >
> > > Index 78018785329, offset 49, bvec.bv_len 1024: In same bio, metadata 
> > > length
> > > 32780
> >
> > Could you share how you're doing your testing? I set up a basic test
> > (created images using every compression type, tested reading them) and
> > so far I'm not able to reproduce this.
>
> I use a very large Squashfs file that triggers the edge case.
>
> That is too big to post, and so I'll see if I can artifically generate
> a small Squashfs filesystem that triggers the edge case.
>
> Phillip

Hi,

This is a Google drive link to a file that triggers the issue.

https://drive.google.com/file/d/1-3-a1BKq62hZGQ6ynioreMSWFMuCV9B4/view?usp=sharing

To reproduce the issue

% mount -t squashfs <the file> /mnt -o errors=panic

then either one of the following will produce a panic

% ls /mnt
% find /mnt -type f | xargs wc > /dev/null


Phillip