The MVS91XX.SYS is a Marvell driver that is used by SATA cards that use the Marvell 4-port SATA controllers. For some reason unhandled exceptions occur with the driver. This is related to the SCSIPORT.SYS crashes.
This BSOS also exists with the Magni driver which is related to the Marvell driver.
Your issue is related to Marvell 91xx SATA Controller Driver which you can download from your system manufacturer’s Website.