[Bug 1435428] Re: vivid: mounting with qemu-nbd fails

[Jason Gerard DeRose]

** Description changed:

  On Trusty and Utopic, this works:
  
  $ sudo modprobe nbd
  $ sudo qemu-nbd --snapshot -c /dev/nbd0 my.qcow2
  $ sudo mount /dev/nbd0p1 /mnt
  $ sudo umount /mnt
  
- But on Vivid, even though the mount command exists with 0, something
- goes awry and the mount point gets unmounted immediately. No files will
+ But on Vivid, even though the mount command exits with 0, something goes
+ awry and the mount point gets unmounted immediately. No files will
  actually be available, and umount will exit with 32 (umount: /mnt: not
  mounted).
  
  Possibly useful bits from dmesg:
  
  [  172.010766] kvm [2750]: vcpu0 disabled perfctr wrmsr: 0xc1 data 0xffff
  [  208.379278]  nbd0: p1 p2 < p5 >
  [  208.395989] EXT4-fs (nbd0p1): mounted filesystem with ordered data mode. Opts: (null)
  [  532.601057] block nbd0: NBD_DISCONNECT
  [  532.601150] block nbd0: Receive control failed (result -32)
  [  532.601177] block nbd0: queue cleared
  [  671.892460]  nbd0: p1 p2 < p5 >
  [  697.575545] EXT4-fs (nbd0p1): mounted filesystem with ordered data mode. Opts: (null)
  [  775.331402] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
  [  793.632005] EXT4-fs (nbd0p1): mounted filesystem with ordered data mode. Opts: (null)
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: qemu-utils 1:2.2+dfsg-5expubuntu8
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Mar 23 10:45:24 2015
  KvmCmdLine:
   COMMAND         STAT  EUID  RUID   PID  PPID %CPU COMMAND
   kvm-irqfd-clean S<       0     0   486     2  0.0 [kvm-irqfd-clean]
   qemu-nbd        Ssl      0     0  3105  1618  0.0 qemu-nbd --snapshot -c /dev/nbd0 -t /home/tribble/vivid-server-amd64.qcow2
  MachineType: Notebook P750ZM
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-9-generic root=UUID=db0af986-9e96-441e-a383-e5b3ba2e837b ro quiet splash
  SourcePackage: qemu
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/25/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.03.09aRSCC
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: P750ZM
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.03.09aRSCC:bd02/25/2015:svnNotebook:pnP750ZM:pvrNotApplicable:rvnNotebook:rnP750ZM:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: P750ZM
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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https://bugs.launchpad.net/bugs/1435428

Title:
  vivid: mounting with qemu-nbd fails

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