[Bug 236042] Windows Server 2016 Hyper-V snapshot triggers SCSI errors

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236042

            Bug ID: 236042
           Summary: Windows Server 2016 Hyper-V snapshot triggers SCSI
                    errors
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: alex.gacovski at gmail.com

Hi,

Currently running FreeBSD 12.0-RELEASE in a Hyper-V Gen 2 with a SCSI virtual
disk.

When Veeam backup takes a hyperv snapshot of the running vm this is printed on
the console.

Feb 21 08:51:40 8797web01 kernel: hvtimesync0: RTT
Feb 21 08:51:40 8797web01 kernel: (da0:storvsc0:0:0:0): WRITE(10). CDB: 2a 00
0a 6e 5a b0 00 00 08 00 
Feb 21 08:51:40 8797web01 kernel: (da0:storvsc0:0:0:0): CAM status: SCSI Status
Error
Feb 21 08:51:40 8797web01 kernel: (da0:storvsc0:0:0:0): SCSI status: Check
Condition
Feb 21 08:51:40 8797web01 kernel: (da0:storvsc0:0:0:0): SCSI sense: UNIT
ATTENTION asc:3f,2 (Changed operating definition)
Feb 21 08:51:40 8797web01 kernel: (da0:storvsc0:0:0:0): Retrying command (per
sense data)
Feb 21 08:54:33 8797web01 kernel: (da0:storvsc0:0:0:0): WRITE(10). CDB: 2a 00
03 b3 14 68 00 00 40 00 
Feb 21 08:54:33 8797web01 kernel: (da0:storvsc0:0:0:0): CAM status: SCSI Status
Error
Feb 21 08:54:33 8797web01 kernel: (da0:storvsc0:0:0:0): SCSI status: Check
Condition
Feb 21 08:54:33 8797web01 kernel: (da0:storvsc0:0:0:0): SCSI sense: UNIT
ATTENTION asc:3f,2 (Changed operating definition)
Feb 21 08:54:33 8797web01 kernel: (da0:storvsc0:0:0:0): Retrying command (per
sense data)

Could it be something is still trying to write to the disk when hyperv signals
the HV VSS driver to freeze the file system?

The system has 1 virtual disk with 3 partitions.
* EFI boot
* swap
* UFS root file system

Thank you.
Cheers,
Alex.

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