[Qemu-devel] [Bug 1721788] [NEW] Failed to get shared "write" lock with 'qemu-img info'

[Jan Heidbrink]

Public bug reported:

When running 'qemu-img info test.qcow2' while test.qcow2 is currently
used by a Qemu process, I get the error

qemu-img: Could not open 'test.qcow2': Failed to get shared "write"
lock.


Why does displaying information about a disk image need a write lock for the 
file?

Steps to reproduce:

qemu-img create -f qcow2 test.qcow2 10M
qemu-system-x86_64 -nographic -drive file=test.qcow2
qemu-img info test.qcow2

The above was tested with Qemu version 2.10.0

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1721788

Title:
  Failed to get shared "write" lock with 'qemu-img info'

Status in QEMU:
  New

Bug description:
  When running 'qemu-img info test.qcow2' while test.qcow2 is currently
  used by a Qemu process, I get the error

  qemu-img: Could not open 'test.qcow2': Failed to get shared "write"
  lock.

  
  Why does displaying information about a disk image need a write lock for the 
file?

  Steps to reproduce:

  qemu-img create -f qcow2 test.qcow2 10M
  qemu-system-x86_64 -nographic -drive file=test.qcow2
  qemu-img info test.qcow2

  The above was tested with Qemu version 2.10.0

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