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Passed the test as below, set the bug as verified.
Packages tested:
kernel-3.10.0-799.el7.x86_64
qemu-kvm-1.5.3-149.el7
Test steps:
1. Create image with large size
# qemu-img create -f qcow2 test_large.qcow2 30720T
Formatting 'test_large.qcow2', fmt=qcow2 size=33776997205278720 encryption=off cluster_size=65536 lazy_refcounts=off
qemu-img: test_large.qcow2: The image size is too large for file format 'qcow2' (try using a larger cluster size)
# qemu-img info test_large.qcow2
image: test_large.qcow2
file format: qcow2
virtual size: 0 (0 bytes)
disk size: 192K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
2. Resize the image with large size
# qemu-img create -f qcow2 test.qcow2 1G
Formatting 'test.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off
# qemu-img info test.qcow2
image: test.qcow2
file format: qcow2
virtual size: 1.0G (1073741824 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
# qemu-img resize test.qcow2 +30720T
qemu-img: Error resizing image: File too large
# qemu-img info test.qcow2
image: test.qcow2
file format: qcow2
virtual size: 1.0G (1073741824 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2018:0816