[Bug 284443] Hyper-V snapshot triggers SCSI errors

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 29 Jan 2025 19:09:40 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284443

            Bug ID: 284443
           Summary: Hyper-V snapshot triggers SCSI errors
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: michael.adm@gmail.com

As a continuation of this
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236042

Hypervisor: Hyper-V 2022 server
VM: gen2, FreeBSD 15.0-CURRENT, ZFS

Veeam B&R makes backup copies from the hypervisor and at this moment this is on
the console and in the log:
...
kernel: (da0:storvsc0:0:0:0): storvsc scsi_status = 2, srb_status = 4
kernel: (da0:storvsc0:0:0:0): WRITE(10). CDB: 2a 00 06 e2 b4 00 00 00 18 00
kernel: (da0:storvsc0:0:0:0): CAM status: SCSI Status Error
kernel: (da0:storvsc0:0:0:0): SCSI status: Check Condition
kernel: (da0:storvsc0:0:0:0): SCSI sense: UNIT ATTENTION asc:3f,2 (Changed
operating definition)
kernel: (da0:storvsc0:0:0:0): Retrying command (per sense data)
...

This bug or not a bug is present in all versions of FreeBSD with Hyper-V
support. I'm surprised that no one has been paying attention to this for so
long.

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