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> i_lock is at offset 128 of struct inode, so that matches the dump.
> I believe that swapper_spaces never have ->host set, so I don't
> believe you've tested this patch since 51b8c1fe250d went in
> back in 2021.

You are totally right. I reproduce the panic in linux-next, and fix
it by patch v4. I should be more careful, since I used Linux 5.14
to test the patch which is a mistake.

Much apologies for the time wasted.

Thanks.