Today one of my virtual machines failed starting.
Previously , I might made a snapshot while VM running.

I got this error in virt-manager:

Error starting domain: internal error: process exited while connecting to monitor: 2015-12-07T08:48:16.006513Z qemu-system-x86_64: -drive file=/home/g1ra/kvmware/centosnfs.qcow2,if=none,id=drive-ide0-0-0,format=qcow2: Could not read snapshots: File too large

Traceback (most recent call last):

  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper

    callback(asyncjob, *args, **kwargs)

  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb

    callback(*args, **kwargs)

  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in newfn

    ret = fn(self, *args, **kwargs)

  File "/usr/share/virt-manager/virtManager/domain.py", line 1423, in startup

    self._backend.create()

  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1029, in create

    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)

libvirtError: internal error: process exited while connecting to monitor: 2015-12-07T08:48:16.006513Z qemu-system-x86_64: -drive file=/home/g1ra/kvmware/centosnfs.qcow2,if=none,id=drive-ide0-0-0,format=qcow2: Could not read snapshots: File too large

From the terminal , I got same error for all qemu-img

g1ra@d7520:~/kvmware$ qemu-img info centosnfs.qcow2

qemu-img: Could not open 'centosnfs.qcow2': Could not read snapshots: File too large

g1ra@d7520:~/kvmware$ qemu-img snapshot -l  centosnfs.qcow2

qemu-img: Could not open 'centosnfs.qcow2': Could not read snapshots: File too large