I/O failure seen in KVM when using SCSI passthrough devices on RHEL 8

Solution Unverified - Updated -

Issue

  • I/O failure seen in KVM when using SCSI passthrough devices:

    kernel: sd 0:0:0:0: [sda] tag#54 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=0s
kernel: sd 0:0:0:0: [sda] tag#54 Sense Key : Illegal Request [current]
kernel: sd 0:0:0:0: [sda] tag#54 Add. Sense: Invalid field in cdb
kernel: sd 0:0:0:0: [sda] tag#54 CDB: Write(10) 2a 00 07 9b 08 00 00 0a 00 00
kernel: blk_update_request: critical target error, dev sda, sector 127600640 op 0x1:(WRITE) flags 0x4000 phys_seg 20 prio class 0
kernel: EXT4-fs warning (device dm-3): ext4_end_bio:323: I/O error 5 writing to inode 14 (offset 16777216 size 8388608 starting block 221184)
....
kernel: sd 2:0:0:12: [sdn] tag#3214 Send: scmd 0x00000000f30af6e1
kernel: sd 2:0:0:12: [sdn] tag#3214 CDB: Test Unit Ready 00 00 00 00 00 00
kernel: sd 2:0:0:12: [sdn] tag#3214 Done: SUCCESS Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
kernel: sd 2:0:0:12: [sdn] tag#3214 CDB: Test Unit Ready 00 00 00 00 00 00
kernel: sd 2:0:0:12: [sdn] tag#3214 scsi host busy 2 failed 0
kernel: sd 2:0:0:12: Notifying upper driver of completion (result 0)
kernel: sd 2:0:0:12: [sdn] tag#3214 0 sectors total, 0 bytes done.

  • Devices showing a max_sectors_kb of 1280:

    [root@host]# cat sys/block/sdc/queue/max_sectors_kb
1280

Environment

  • Red Hat Enterprise Linux 8

  • KVM config using SCSI passthrough. For example:

    <disk type='block' device='lun'>
   <driver name='qemu' type='raw'/>
   <source dev='/dev/mapper/test' index='1'>
     <reservations managed='yes'>
      <source type='unix' path='/var/lib/libvirt/qemu/domain-1-test/test0.sock' mode='client'/>
     </reservations>
     <privateData>
       <nodenames>
         <nodename type='storage' name='libvirt-1-storage'/>
         <nodename type='format' name='libvirt-1-format'/>
       </nodenames>
       <reservations mgralias='test0'/>
     </privateData>
   </source>
   <backingStore/>
   <target dev='sda' bus='scsi'/>
   <alias name='scsi0-0-0-0'/>
   <address type='drive' controller='0' bus='0' target='0' unit='0'/>
   <privateData>
     <qom name='scsi0-0-0-0'/>
   </privateData>
 </disk>

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