Ming, > BTW, which tree are you based for applying this patchset? 5.12/scsi-queue > I apply the patchset against for-5.12/block, and run it on kvm with > 'megasas' device(LSI MegaRAID SAS 1078), looks it works well, and not > see the hang issue. I tried with for-5.12/block and it still breaks for me. Things work fine up until: scsi: core: Replace sdev->device_busy with sbitmap After that patch is applied no disks are discovered on my SAS/FC hosts. -- Martin K. Petersen Oracle Linux Engineering