Hi,

This occurs on CI every now and then,
taken from: https://jenkins.ovirt.org/job/vdsm_standard-check-patch/18302//artifact/check-patch.tests-py3.el8.x86_64/mock_logs/script/stdout_stderr.log

Thanks

________ TestConvertPreallocation.test_qcow2_to_raw_preallocated[full] _________

self = <storage.qemuimg_test.TestConvertPreallocation object at 0x7f9bac7c3ef0>
preallocation = 'full'

    @pytest.mark.parametrize("preallocation", [
        qemuimg.PREALLOCATION.FALLOC,
        qemuimg.PREALLOCATION.FULL,
    ])
    def test_qcow2_to_raw_preallocated(self, preallocation):
        virtual_size = 10 * MiB
        with namedTemporaryDir() as tmpdir:
            src = os.path.join(tmpdir, 'src')
            dst = os.path.join(tmpdir, 'dst')
    
            op = qemuimg.create(src, size=virtual_size, format="qcow2")
            op.run()
    
            op = qemuimg.convert(src, dst, srcFormat="qcow2", dstFormat="raw",
                                 preallocation=preallocation)
            op.run()
>           check_raw_preallocated_image(dst, virtual_size)

storage/qemuimg_test.py:561: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

path = '/var/tmp/tmpxr0emprz/dst', virtual_size = 10485760

    def check_raw_preallocated_image(path, virtual_size):
        image_stat = os.stat(path)
        assert image_stat.st_size == virtual_size
>       assert image_stat.st_blocks * 512 == virtual_size
E       assert (20488 * 512) == 10485760
E        +  where 20488 = os.stat_result(st_mode=33188, st_ino=411528, st_dev=2049, st_nlink=1, st_uid=0, st_gid=0, st_size=10485760, st_atime=1581845207, st_mtime=1581845207, st_ctime=1581845207).st_blocks

storage/qemuimg_test.py:621: AssertionError