[Bug 223238] Persistent iscsi underflow mismatch errors followed by apparent kernel panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223238

            Bug ID: 223238
           Summary: Persistent iscsi underflow mismatch errors followed by
                    apparent kernel panic
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: randomnoise058 at gmail.com

VirtualBox FBSD guest (on a FBSD host)

11.1-RELEASE FreeBSD 11.1-RELEASE #0 r324971M: Wed Oct 25 08:01:10 CDT 2017    
root at fbsd11.vboxnet:/usr/obj/usr/src/sys/GENERIC  amd64


Using iscsi connection to a Synology NAS/SAN providing multiple Targets with
one or more LUNs results in periodic error messages such as:

kernel: WARNING: 192.168.1.19:3260
(iqn.2000-01.com.synology:ds216j.Target-12.c16e0895b7): underflow mismatch:
target indicates 0, we calculated 4

kernel: WARNING: 192.168.1.19:3260
(iqn.2000-01.com.synology:ds216j.Target-12.c16e0895b7): underflow mismatch:
target indicates 0, we calculated 8


iSCSI messages observed on Synology SAN/Nas:

2017-10-25T08:43:03-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0xb7,
sending CHECK_CONDITION.
2017-10-25T08:43:04-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0x37,
sending CHECK_CONDITION.
2017-10-25T08:43:05-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0xb7,
sending CHECK_CONDITION.
2017-10-25T08:43:05-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0x37,
sending CHECK_CONDITION.
2017-10-25T08:43:06-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0xb7,
sending CHECK_CONDITION.
2017-10-25T08:43:06-05:00 ds216j kernel:
target_core_transport.c:1783:target_setup_cmd_from_cdb
iSCSI/iqn.1994-09.org.freebsd:fbsd11.vboxnet: Unsupported SCSI Opcode 0x37,
sending CHECK_CONDITION.


After some period of time the system hangs/locks up (kernel panic?) and has to
be "killed" and rebooted.

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