[Bug 204794] [hyper-v] [panic] when attaching a physical drive

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204794

            Bug ID: 204794
           Summary: [hyper-v] [panic] when attaching a physical drive
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kwhite at site.uottawa.ca

When attaching a physical drive to a recent 11-CURRENT snapshot running under
hyper-v on Windows 10 I get this panic:

panic: vm_srb->sense_info_len <= request->sense_info_len

Roughly at /usr/src/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c:774

I modified the source slightly to work-around the KASSERT, and was then able to
successfully use the drive (2TB ZFS volume).

774                     if (vm_srb->sense_info_len > request->sense_info_len) {
775                             printf("vm_srb->sense_info_len is %d,
request->sense_info_len is %d\n", vm_srb->sense_info_len,
request->sense_info_len);
776                             vm_srb->sense_info_len =
request->sense_info_len;
777                     }
778                     KASSERT(vm_srb->sense_info_len <=
request->sense_info_len,
779                                     ("vm_srb->sense_info_len <= "
780                                      "request->sense_info_len"));

...keith

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