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[Bug 1470250] Re: [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based Backups

 

No luck with the Xenial kernel (4.4.0-22), I could repro the crash 2
times (after a couple of hours each). Testing the Wily kernel next.

Here is the relevant part of the logs (both crashes produced near
identical logs):

Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: Device offlined - not ready after error recovery
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: [sda] tag#73 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: [sda] tag#73 CDB: Write(10) 2a 00 01 16 6c 00 00 04 00 00
Jun 07 20:19:44 muchcrash02 kernel: blk_update_request: I/O error, dev sda, sector 18246656
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: rejecting I/O to offline device
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: [sda] killing request
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: rejecting I/O to offline device
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: [sda] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: [sda] CDB: Write(10) 2a 00 01 17 60 00 00 04 00 00
Jun 07 20:19:44 muchcrash02 kernel: blk_update_request: I/O error, dev sda, sector 18309120
Jun 07 20:19:44 muchcrash02 kernel: EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -5 writing to inode 921923 (offset 234881024 size 8388608 starting block 2288896)
Jun 07 20:19:44 muchcrash02 kernel: Buffer I/O error on device sda1, logical block 2288384
..
Jun 07 20:19:44 muchcrash02 kernel: Buffer I/O error on device sda1, logical block 2288393
Jun 07 20:19:44 muchcrash02 kernel: sd 2:0:0:0: rejecting I/O to offline device

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Title:
  [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based
  Backups

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress

Bug description:
  Customers have reported running various versions of Ubuntu 14.04.2 LTS
  on Generation 2 Hyper-V Hosts.    On a random Basis, the file system
  will be mounted Read-Only due to a "disk error" (which really isn't
  the case here).    As a result, they must reboot the Ubuntu guest to
  get the file system to mount RW again.

  The Error seen are the following:
  Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968142] storvsc: Sense Key : Unit Attention [current] 
  Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968145] storvsc: Add. Sense: Changed operating definition
  Apr 30 00:02:01 balticnetworkstraining kernel: [640153.968161] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
  Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584164] hv_storvsc vmbus_0_4: cmd 0x2a scsi status 0x2 srb status 0x82
  Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584178] hv_storvsc vmbus_0_4: stor pkt ffff88006eb6c700 autosense data valid - len 18
  Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584180] storvsc: Sense Key : Unit Attention [current] 
  Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584183] storvsc: Add. Sense: Changed operating definition
  Apr 30 01:23:26 balticnetworkstraining kernel: [645039.584198] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed.  The Linux SCSI layer does not automatically adjust these parameters.

  This relates to the VSS "Windows Server Backup" process that kicks off at midnight on the host and finishes an hour and half later.   
  Yes, we do have hv_vss_daemon and hv_kvp_daemon running for the correct kernel version we have.   We're currently running kernel version 3.13.0-49-generic #83 on one system and 3.16.0-34-generic #37 on the other. -- We see the same errors on both.
  As a result, we've been hesitant to drop any more ubuntu guests on our 2012R2 hyper-v system because of this.   We can stop the backup process and all is good, but we need nightly backups to image all of our VM's.   All the windows guests have no issues of course.   We also have some CentOS based guests running without issues from what we've seen.

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References