>>>>> "Stephen" == Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> writes: Stephen, Stephen> Hyper-V host emulation of SCSI for virtual DVD device reports Stephen> SCSI version 0 (UNKNOWN) but is still capable of supporting Stephen> REPORTLUN. Stephen> Without this patch, a GEN2 Linux guest on Hyper-V will not boot Stephen> 4.11 successfully with virtual DVD ROM device. What happens is Stephen> that the SCSI scan process falls back to doing sequential Stephen> probing by INQUIRY. But the storvsc driver has a previous Stephen> workaround that masks/blocks all errors reports from INQUIRY Stephen> (or MODE_SENSE) commands. This workaround causes the scan to Stephen> then populate a full set of bogus LUN's on the target and then Stephen> sends kernel spinning off into a death spiral doing block reads Stephen> on the non-existent LUNs. Stephen> By setting the correct blacklist flags, the target with the DVD Stephen> device is scanned with REPORTLUN and that works correctly. Applied to 4.11/scsi-fixes. Thank you! -- Martin K. Petersen Oracle Linux Engineering
