"kernel: Buffer I/O error on dev sr0" message in Hyper-V guest.

Solution In Progress - Updated -

Issue

  • Error logs about sr0 are seen on syslog:

    Mar 15 04:31:58 localhost kernel: sr 2:0:0:0: [sr0] tag#186 unaligned transfer
Mar 15 04:31:58 localhost kernel: I/O error, dev sr0, sector 8 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
Mar 15 04:31:58 localhost kernel: I/O error, dev sr0, sector 8 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Mar 15 04:31:58 localhost kernel: Buffer I/O error on dev sr0, logical block 1, async page read
Mar 15 04:31:58 localhost kernel: sr 0:0:0:2: [sr0] tag#133 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Mar 15 04:31:58 localhost kernel: sr 0:0:0:2: [sr0] tag#134 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s 
Mar 15 04:31:58 localhost kernel: sr 2:0:0:0: [sr0] tag#187 unaligned transfer

  • These logs are outputted even though there is no media on the CD/DVD drive.

Environment

  • Red Hat Enterprise Linux 9
  • Hyper-V

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