[Bug 233745] [regression] [iscsi] ctladm devlist -v doesn't show file backends for certain targets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233745

            Bug ID: 233745
           Summary: [regression] [iscsi] ctladm devlist -v doesn't show
                    file backends for certain targets
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: emz at norma.perm.ru

after upgrading some of my iSCSI systems to 12.x, I noticed that ctladm devlist
-v (and devlist -x) doesn't show file backends for a numerous targets. This
doesn't reflect their current state, because the initiators, using these
targets are able to fully access their block devices via iSCSI.

When modified, these targets may start to show their file backends, so the
exact nature of this behavior is currently unknown to me.

This behavior is new for 12.x and reproducible at least on the following
revisions:

FreeBSD san1.gcore1.playkey.net 12.0-PRERELEASE FreeBSD 12.0-PRERELEASE r340935
GENERIC  amd64
FreeBSD san1.bsh.playkey.net 12.0-PRERELEASE FreeBSD 12.0-PRERELEASE r340754
GENERIC  amd64
FreeBSD san1.gcore2.playkey.net 12.0-PRERELEASE FreeBSD 12.0-PRERELEASE r340933
GENERIC  amd64

===Cut===
407 block           16106127360  512 MYSERIAL0376     games-vm154     
      lun_type=0
      num_threads=14
      vendor=FREE_TT
      rpm=1
      formfactor=3
394 block             104857600  512 MYSERIAL0376     desktop-vm148   
      lun_type=0
      num_threads=14
      vendor=FREE_TT
      rpm=1
      formfactor=3
395 block           16106127360  512 MYSERIAL0376     games-vm148     
      lun_type=0
      num_threads=14
      vendor=FREE_TT
      rpm=1
      formfactor=3
 99 block             104857600  512 MYSERIAL0376     desktop-master-m40
      lun_type=0
      num_threads=14
      vendor=FREE_TT
      rpm=1
      formfactor=3
      file=/dev/zvol/data/kvm/desktop/desktop-master-m40
      ctld_name=iqn.2016-04.net.playkey.iscsi:desktop-master-m40,lun,0
      scsiname=iqn.2016-04.net.playkey.iscsi:desktop-master-m40,lun,0
366 block             104857600  512 MYSERIAL0376     desktop-vm134   
      lun_type=0
      num_threads=14
      file=/dev/zvol/data/kvm/desktop/desktop-vm134
      vendor=FREE_TT
      scsiname=iqn.2016-04.net.playkey.iscsi:desktop-vm134,lun,0
      ctld_name=iqn.2016-04.net.playkey.iscsi:desktop-vm134,lun,0
367 block           16106127360  512 MYSERIAL0376     games-vm134     
      lun_type=0
      num_threads=14
      file=/dev/zvol/data/kvm/desktop/games-vm134
      vendor=FREE_TT
      scsiname=iqn.2016-04.net.playkey.iscsi:games-vm134,lun,0
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-vm134,lun,0
104 block             104857600  512 MYSERIAL0376     desktop-vm3     
      lun_type=0
      num_threads=14
      file=/dev/zvol/data/kvm/desktop/desktop-vm3
      vendor=FREE_TT
      scsiname=iqn.2016-04.net.playkey.iscsi:desktop-vm3,lun,0
      ctld_name=iqn.2016-04.net.playkey.iscsi:desktop-vm3,lun,0
105 block           16106127360  512 MYSERIAL0376     games-vm3       
      lun_type=0
      num_threads=14
      file=/dev/zvol/data/kvm/desktop/games-vm3
      vendor=FREE_TT
      scsiname=iqn.2016-04.net.playkey.iscsi:games-vm3,lun,0
      ctld_name=iqn.2016-04.net.playkey.iscsi:games-vm3,lun,0
===Cut===

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