It's been more than 1.5 years! When can we expect this fix to be released?
$ uname -a Linux Server123 3.13.0-107-generic #154-Ubuntu SMP Tue Dec 20 09:57:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.5 LTS Release: 14.04 Codename: trusty Jan 30 01:54:55 Server123 kernel: [78577.687381] cifs_vfs_err: 18 callbacks suppressed Jan 30 01:54:55 Server123 kernel: [78577.687389] CIFS VFS: open dir failed Jan 30 01:54:55 Server123 kernel: [78577.692074] CIFS VFS: open dir failed Jan 30 01:54:56 Server123 kernel: [78578.027096] CIFS VFS: open dir failed Jan 30 01:54:56 Server123 kernel: [78578.031664] CIFS VFS: open dir failed Jan 30 03:00:27 Server123 Hyper-V VSS: VSS: freeze of /archive: Success Jan 30 03:00:27 Server123 Hyper-V VSS: VSS: freeze of /: Success Jan 30 03:00:27 Server123 kernel: [82509.382621] hv_storvsc vmbus_0_1: cmd 0x28 scsi status 0x2 srb status 0x82 Jan 30 03:00:27 Server123 kernel: [82509.382730] hv_storvsc vmbus_0_1: stor pkt ffff8800d306d368 autosense data valid - len 18 Jan 30 03:00:27 Server123 kernel: [82509.382735] storvsc: Sense Key : Unit Attention [current] Jan 30 03:00:27 Server123 kernel: [82509.382741] storvsc: Add. Sense: Changed operating definition Jan 30 03:00:27 Server123 kernel: [82509.382811] sd 2:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters. Jan 30 03:00:27 Server123 Hyper-V VSS: VSS: thaw of /archive: Success Jan 30 03:00:27 Server123 Hyper-V VSS: VSS: thaw of /: Success Jan 30 03:00:57 Server123 kernel: [82539.424627] hv_storvsc vmbus_0_1: cmd 0x2a scsi status 0x2 srb status 0x82 Jan 30 03:00:57 Server123 kernel: [82539.424678] hv_storvsc vmbus_0_1: stor pkt ffff8800b89df468 autosense data valid - len 18 Jan 30 03:00:57 Server123 kernel: [82539.424683] storvsc: Sense Key : Unit Attention [current] Jan 30 03:00:57 Server123 kernel: [82539.424689] storvsc: Add. Sense: Changed operating definition Jan 30 03:00:57 Server123 kernel: [82539.424834] sd 2:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1470250 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 Xenial: In Progress Status in linux source package in Yakkety: In Progress Status in linux source package in Zesty: 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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