Re: [PATCH v2 0/6] btrfs: preparation patches for the incoming metadata folio conversion

[David Sterba <dsterba@suse.cz>]

On Fri, Jul 14, 2023 at 06:32:27PM +0800, Qu Wenruo wrote:
> >> Already running the auto group with that branch, and no explosion so far
> >> (btrfs/004 failed to mount with -o atime though).
> >>
> >> Any extra setup needed to trigger the failure?
> >
> > I'm not aware of anything different than usual. Patches applied to git,
> > built, updated VM and started. I had another branch built and tested and
> > it finished the fstests. I can at least bisect which patch does it.
> 
> A bisection would be very appreciated.
> 
> Although I guess it should be the memcpy_extent_buffer() patch, I didn't
> see something obvious right now...

5ebf7593abb81ec1993f31e90a7573b75aff4db4 is the first bad commit
btrfs: refactor main loop in memcpy_extent_buffer()

$ git bisect log
# bad: [5c6c140622dd7107acb13da404f0c682f1f954a6] btrfs: copy all pages at once at the end of btrfs_clone_extent_buffer()
# good: [72c15cf7e64769ca9273a825fff8495d99975c9c] btrfs: deprecate integrity checker feature
git bisect start 'ext/qu-eb-page-clanups-updated-broken' '72c15cf7e64769ca9273a825fff8495d99975c9c'
# good: [85ab525a6a63c477b92099835d6b05eaebd4ad4b] btrfs: use write_extent_buffer() to implement write_extent_buffer_*id()
git bisect good 85ab525a6a63c477b92099835d6b05eaebd4ad4b
# bad: [cd6668ef43a224b3f8130b78f4e3b922a7175a05] btrfs: refactor main loop in copy_extent_buffer_full()
git bisect bad cd6668ef43a224b3f8130b78f4e3b922a7175a05
# bad: [5ebf7593abb81ec1993f31e90a7573b75aff4db4] btrfs: refactor main loop in memcpy_extent_buffer()
git bisect bad 5ebf7593abb81ec1993f31e90a7573b75aff4db4
# first bad commit: [5ebf7593abb81ec1993f31e90a7573b75aff4db4] btrfs: refactor main loop in memcpy_extent_buffer()