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Date:   Tue, 7 Nov 2023 00:29:49 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Dave Chinner <david@fromorbit.com>
Cc:     Zorro Lang <zlang@redhat.com>, linux-xfs@vger.kernel.org,
        fstests@vger.kernel.org, "Darrick J. Wong" <djwong@kernel.org>,
        Carlos Maiolino <carlos@maiolino.me>
Subject: Re: [Bug report][fstests generic/047] Internal error !(flags &
 XFS_DABUF_MAP_HOLE_OK) at line 2572 of file fs/xfs/libxfs/xfs_da_btree.c.
 Caller xfs_dabuf_map.constprop.0+0x26c/0x368 [xfs]
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On Tue, Nov 07, 2023 at 07:33:50AM +1100, Dave Chinner wrote:
> That's not good. Can you please determine if this is a zero-day bug
> with the nrext64 feature? I think it was merged in 5.19, so if you
> could try to reproduce it on a 5.18 and 5.19 kernels first, that
> would be handy.
> 
> Also, from your s390 kernel build, can you get the pahole output
> for the struct xfs_dinode both for a good kernel and a bad kernel?

Another interesting angle is that s390 is the only mainstream big
endian platform left.  It might be interesting to also try to
reproduce this in a ppc64be or sparc64 system if someone has one
or a VM).