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Block cloning normally creates dirty record without dr_data. But if the block is read after cloning, it is moved into DB_CACHED state and receives the data buffer. If after that we call dbuf_unoverride() to convert the dirty record into normal write, we should give it the data buffer from dbuf and release one. Reviewed-by: Kay Pedersen <mail@mkwg.de> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15654 Closes #15656