Re: kernel BUG at fs/ext4/inode.c:1914 - page_buffers()

["Theodore Ts'o" <tytso@mit.edu>]

On Wed, Oct 04, 2023 at 06:10:16AM -0400, Sasha Levin wrote:
> On Wed, Oct 04, 2023 at 11:37:22AM +0200, Mathieu Othacehe wrote:
> > 
> > bd159398a2d2 ("jdb2: Don't refuse invalidation of already invalidated buffers")
> > d84c9ebdac1e ("ext4: Mark pages with journalled data dirty")
> > 265e72efa99f ("ext4: Keep pages with journalled data dirty")
> > 5e1bdea6391d ("ext4: Clear dirty bit from pages without data to write")
> > 1f1a55f0bf06 ("ext4: Commit transaction before writing back pages in data=journal mode")
> > e360c6ed7274 ("ext4: Drop special handling of journalled data from ext4_sync_file()")
> > c000dfec7e88 ("ext4: Drop special handling of journalled data from extent shifting operations")
> > 783ae448b7a2 ("ext4: Fix special handling of journalled data from extent zeroing")
> > 56c2a0e3d90d ("ext4: Drop special handling of journalled data from ext4_evict_inode()")
> > 7c375870fdc5 ("ext4: Drop special handling of journalled data from ext4_quota_on()")
> > 951cafa6b80e ("ext4: Simplify handling of journalled data in ext4_bmap()")
> > ab382539adcb ("ext4: Update comment in mpage_prepare_extent_to_map()")
> > d0ab8368c175 ("Revert "ext4: Fix warnings when freezing filesystem with journaled data"")
> > 1077b2d53ef5 ("ext4: fix fsync for non-directories")
> > 
> > Or apply the proposed, attached patch. Do you think that would be an
> > option?
> 
> Backporting the series would be ideal. Is this only for the 5.15 kernel?

If we're going to backport all of these patches, I'd really would like
to see a full regression test run, using something like:

   gce-xfstests ltm -c ext4/all -g auto

before and after applying all of these patches, to make sure there are
no regression.

(or you can "kvm-xfstests -c ext4/all -g auto" but be prepared for it
to take over 24 hours of run time.  With gce-xfstesets we start a
dozen VM's in parallel so it finishes in about 2.5 hours.  See
https://thunk.org/gce-xfstests for more information.)

If you someone who does the backports can send me a pointer to a git
branch, I can run the tests for you, if that would be helpful.

Thanks!!

				       - Ted