[Qemu-devel] [Bug 1410288] Re: qemu-img conversion to qcow2 hangs with blank image less than 100kiB

[Robie Basak]

qemu is 2.5 in 16.04 and 2.6.1 in Zesty, so this is presumably Fix
Released now. If incorrect, please explain and reopen.

** Changed in: qemu (Ubuntu)
       Status: Triaged => Fix Released

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Title:
  qemu-img conversion to qcow2 hangs with blank image less than 100kiB

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released

Bug description:
  If you try to convert a blank image to qcow2 that is less than 100kiB
  in size then qemu-img hangs trying to seek to the end of the file.

  $ truncate --size 102399 /tmp/temp
  $ qemu-img convert -p -O qcow2 /tmp/temp /tmp/temp2.qcow2

  I'm finding this on all versions of qemu-img v2.

  strace shows a seek loop.

  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0
  ioctl(6, FS_IOC_FIEMAP, 0xb5e68dc4)     = 0
  _llseek(6, 0, [100000], SEEK_END)       = 0

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: qemu-utils 2.0.0+dfsg-2ubuntu1.10
  ProcVersionSignature: User Name 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic i686
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: i386
  Date: Tue Jan 13 14:30:39 2015
  SourcePackage: qemu
  UpgradeStatus: No upgrade log present (probably fresh install)

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