linux-ext4 - Re: kernel BUG at fs/ext4/inode.c:1914

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Date:   Fri, 22 Sep 2023 11:54:36 +0200
From:   Jan Kara <jack@...e.cz>
To:     Mathieu Othacehe <othacehe@....org>
Cc:     Marcus Hoffmann <marcus.hoffmann@...ermo.de>, tytso@....edu,
        famzah@...soft.com, gregkh@...uxfoundation.org, jack@...e.cz,
        linux-ext4@...r.kernel.org
Subject: Re: kernel BUG at fs/ext4/inode.c:1914 - page_buffers()

Hello,

On Wed 20-09-23 11:40:24, Mathieu Othacehe wrote:
> I also encountered that specific issue while migrating from 4.14 to 5.15
> with data=journal. The proposed patch fixes the issue for me. The 6.1
> branch seems to be affected as well. Would it be an option to have that
> patch applied to stable branches?

Well, Greg is rather reluctant to merge into stable tree patches that were
not included upstream. But with a good reason he could do that. I guess the
easiest is to try - take the backported fix and officially submit it to
stable@...r.kernel.org with the explanation why you are submitting
non-upstream patch - in particular that upstream solution is some 14
patch series.

Alternative solution is to backport and test the upstream solution:
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")

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR