[Qemu-devel] kvm: Failed to flush the L2 table cache: Input/output error

[Stefan Priebe - Profihost AG]

Hello,

while using qemu 2.9.1 and doing a backup of a disk:

I have sometimes the following output:

Formatting '/mnt/qemu-249-2017_11_19-04_00_05.qcow2', fmt=qcow2
size=236223201280 encryption=off cluster_size=65536 lazy_refcounts=off
refcount_bits=16


followed by:

kvm: Failed to flush the L2 table cache: Input/output error
kvm: Failed to flush the refcount block cache: Input/output error

If this error happens (Failed to flush) the whole backup is incomplete.
Host kernel is a 4.4 based openSuSE 42.3 kernel.

Is this a known bug?

Greets,
Stefan