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[Bug 1397590] Re: storvsc attaches the same virtual HDD multiple times

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Fri, 01 Jan 2016 23:14:39 -0000
Reply-to: Bug 1397590 <1397590@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Tags added: cherry-pick

** Changed in: linux-lts-trusty (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux-lts-trusty (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1397590

Title:
  storvsc attaches the same virtual HDD multiple times

Status in linux-lts-trusty package in Ubuntu:
  Triaged

Bug description:
  I'm using Ubuntu Server 14.04.1 LTS as client on Microsoft Hyper-V host which is Windows Server 2008 R2 SP1 machine.
  When upgrading kernel version from 3.13.0.36 to 3.13.0.37 I noticed that the same SCSI virtual HDD is recognized multiple times and attached as separate devices: sdb, sdc, sdd, ..., sdi.
  Here is a piece of dmesg report when booting 3.13.0.37 kernel:

  [    6.118883] scsi 2:0:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.119282] sd 2:0:0:0: Attached scsi generic sg1 type 0
  [    6.119557] sd 2:0:0:0: [sda] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
  [    6.119756] sd 2:0:0:0: [sda] Write Protect is off
  [    6.119759] sd 2:0:0:0: [sda] Mode Sense: 0f 00 10 00
  [    6.119849] sd 2:0:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.120615] scsi3 : storvsc_host_t
  [    6.121012] scsi 3:0:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.122622] scsi scan: INQUIRY result too short (5), using 36
  [    6.123105] scsi scan: INQUIRY result too short (5), using 36
  [    6.123457] scsi 3:1:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.124657] hv_netvsc: hv_netvsc channel opened successfully
  [    6.124692]  sda: sda1
  [    6.124750] scsi scan: INQUIRY result too short (5), using 36
  [    6.125775] scsi scan: INQUIRY result too short (5), using 36
  [    6.126111] scsi 3:2:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.126341] scsi scan: INQUIRY result too short (5), using 36
  [    6.126473] scsi scan: INQUIRY result too short (5), using 36
  [    6.126608] scsi 3:3:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.126668] sd 2:0:0:0: [sda] Attached SCSI disk
  [    6.126807] scsi scan: INQUIRY result too short (5), using 36
  [    6.126978] scsi scan: INQUIRY result too short (5), using 36
  [    6.127092] scsi 3:4:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.127281] scsi scan: INQUIRY result too short (5), using 36
  [    6.127382] scsi scan: INQUIRY result too short (5), using 36
  [    6.127499] scsi 3:5:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.127681] scsi scan: INQUIRY result too short (5), using 36
  [    6.127786] scsi scan: INQUIRY result too short (5), using 36
  [    6.127900] scsi 3:6:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.128076] scsi scan: INQUIRY result too short (5), using 36
  [    6.128180] scsi scan: INQUIRY result too short (5), using 36
  [    6.128299] scsi 3:7:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.128479] scsi scan: INQUIRY result too short (5), using 36
  [    6.128583] scsi scan: INQUIRY result too short (5), using 36
  [    6.129085] sd 3:0:0:0: Attached scsi generic sg2 type 0
  [    6.129321] sd 3:0:0:0: [sdb] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.129654] sd 3:1:0:0: Attached scsi generic sg3 type 0
  [    6.129901] sd 3:1:0:0: [sdc] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.130071] sd 3:2:0:0: Attached scsi generic sg4 type 0
  [    6.130167] sd 3:0:0:0: [sdb] Write Protect is off
  [    6.130171] sd 3:0:0:0: [sdb] Mode Sense: 0f 00 10 00
  [    6.130457] sd 3:3:0:0: Attached scsi generic sg5 type 0
  [    6.130707] sd 3:0:0:0: [sdb] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.130712] sd 3:1:0:0: [sdc] Write Protect is off
  [    6.130715] sd 3:1:0:0: [sdc] Mode Sense: 0f 00 10 00
  [    6.130926] sd 3:4:0:0: Attached scsi generic sg6 type 0
  [    6.131339] sd 3:1:0:0: [sdc] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.131662] sd 3:5:0:0: Attached scsi generic sg7 type 0
  [    6.131886] sd 3:6:0:0: Attached scsi generic sg8 type 0
  [    6.132000] sd 3:2:0:0: [sdd] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.132106] sd 3:7:0:0: Attached scsi generic sg9 type 0
  [    6.132640] sd 3:3:0:0: [sde] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.132903] sd 3:2:0:0: [sdd] Write Protect is off
  [    6.132907] sd 3:2:0:0: [sdd] Mode Sense: 0f 00 10 00
  [    6.133439] sd 3:2:0:0: [sdd] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.133661] sd 3:3:0:0: [sde] Write Protect is off
  [    6.133664] sd 3:3:0:0: [sde] Mode Sense: 0f 00 10 00
  [    6.133950] sd 3:4:0:0: [sdf] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.134218] sd 3:3:0:0: [sde] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.134658] sd 3:4:0:0: [sdf] Write Protect is off
  [    6.134661] sd 3:4:0:0: [sdf] Mode Sense: 0f 00 10 00
  [    6.135189] sd 3:4:0:0: [sdf] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.136335] sd 3:5:0:0: [sdg] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.136425] sd 3:6:0:0: [sdh] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.136580] sd 3:5:0:0: [sdg] Write Protect is off
  [    6.136584] sd 3:5:0:0: [sdg] Mode Sense: 0f 00 10 00
  [    6.136736] sd 3:5:0:0: [sdg] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.136743] sd 3:6:0:0: [sdh] Write Protect is off
  [    6.136747] sd 3:6:0:0: [sdh] Mode Sense: 0f 00 10 00
  [    6.137173] sd 3:6:0:0: [sdh] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.138982]  sdb: sdb1 sdb2
  [    6.138986]  sdc: sdc1 sdc2
  [    6.139185] sd 3:7:0:0: [sdi] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.139671] sd 3:7:0:0: [sdi] Write Protect is off
  [    6.139674] sd 3:7:0:0: [sdi] Mode Sense: 0f 00 10 00
  [    6.139828] sd 3:7:0:0: [sdi] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.140112] sd 3:0:0:0: [sdb] Attached SCSI disk
  [    6.140116] sd 3:1:0:0: [sdc] Attached SCSI disk
  [    6.147631] hv_netvsc vmbus_0_9: Device MAC 00:15:5d:01:36:03 link state up
  [    6.149689]  sdg: sdg1 sdg2
  [    6.149742]  sde: sde1 sde2
  [    6.149773]  sdi: sdi1 sdi2
  [    6.150282] hv_netvsc: hv_netvsc channel opened successfully
  [    6.150413]  sdf: sdf1 sdf2
  [    6.150448]  sdh: sdh1 sdh2
  [    6.150835]  sdd: sdd1 sdd2
  [    6.152237] sd 3:6:0:0: [sdh] Attached SCSI disk
  [    6.152276] sd 3:4:0:0: [sdf] Attached SCSI disk
  [    6.152371] sd 3:2:0:0: [sdd] Attached SCSI disk
  [    6.152517] sd 3:3:0:0: [sde] Attached SCSI disk
  [    6.152537] sd 3:5:0:0: [sdg] Attached SCSI disk
  [    6.152545] sd 3:7:0:0: [sdi] Attached SCSI disk
  [    6.204673] hv_netvsc vmbus_0_10: Device MAC 00:15:5d:01:36:04 link state up
  [    6.229274] random: nonblocking pool is initialized
  [    6.400669] EXT4-fs (sdh2): mounted filesystem with ordered data mode. Opts: (null)

  Note, that I use two virtual HDDs: one IDE mounted as /boot and one
  SCSI mounted as /. IDE HDD recognized correctly.

  The same piece of dmesg when booting 3.13.0-36 kernel looks like:

  [    6.395402] scsi 2:0:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.396193] sd 2:0:0:0: [sda] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
  [    6.396404] sd 2:0:0:0: [sda] Write Protect is off
  [    6.396409] sd 2:0:0:0: [sda] Mode Sense: 0f 00 10 00
  [    6.396541] sd 2:0:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.396895] sd 2:0:0:0: Attached scsi generic sg1 type 0
  [    6.398751] hv_netvsc: hv_netvsc channel opened successfully
  [    6.399441]  sda: sda1
  [    6.401185] sd 2:0:0:0: [sda] Attached SCSI disk
  [    6.423093] hv_netvsc vmbus_0_10: Device MAC 00:15:5d:01:36:04 link state up
  [    6.425530] scsi3 : storvsc_host_t
  [    6.425954] scsi 3:0:0:0: Direct-Access     Msft     Virtual Disk     1.0  PQ: 0 ANSI: 4
  [    6.426243] sd 3:0:0:0: Attached scsi generic sg2 type 0
  [    6.426455] sd 3:0:0:0: [sdb] 266338304 512-byte logical blocks: (136 GB/127 GiB)
  [    6.426587] sd 3:0:0:0: [sdb] Write Protect is off
  [    6.426591] sd 3:0:0:0: [sdb] Mode Sense: 0f 00 10 00
  [    6.426680] sd 3:0:0:0: [sdb] Write cache: disabled, read cache: enabled, supports DPO and FUA
  [    6.440294]  sdb: sdb1 sdb2
  [    6.441930] sd 3:0:0:0: [sdb] Attached SCSI disk
  [    6.598784] EXT4-fs (sdb2): mounted filesystem with ordered data mode. Opts: (null)

  Complete dmesg files are in attachment.
  I tried newer kernels - 3.13.0.40 and 3.16.0.25 with the same result. Also I noticed that the same bug is present in Fedora 20.
  The bug is not present if Hyper-V host is Windows 8 (except messages "INQUIRY result too short").

  Nevertheless, the system with this bug is bootable and workable. The
  only problem I noticed  is that update-grub recognizes Linux on each
  attached extra virtual disk and creates unbootable grub.cfg.

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