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host info: # uname -r && rpm -q qemu-kvm 3.10.0-205.el7.x86_64 qemu-kvm-1.5.3-79.el7.x86_64 # qemu-img amend -o compat=0.10 -f qcow2 copy.img qemu-img: block/qcow2-cluster.c:1552: expand_zero_clusters_in_l1: Assertion `(cluster_index >= 0) && (cluster_index < *nb_clusters)' failed. Aborted (core dumped) (gdb) bt #0 0x00007f8b53b555d7 in raise () from /lib64/libc.so.6 #1 0x00007f8b53b56cc8 in abort () from /lib64/libc.so.6 #2 0x00007f8b53b4e546 in __assert_fail_base () from /lib64/libc.so.6 #3 0x00007f8b53b4e5f2 in __assert_fail () from /lib64/libc.so.6 #4 0x00007f8b55b1d1eb in expand_zero_clusters_in_l1 (bs=bs@entry=0x7f8b578e3400, l1_table=<optimized out>, l1_size=<optimized out>, expanded_clusters=expanded_clusters@entry=0x7fff5a23cd70, nb_clusters=nb_clusters@entry=0x7fff5a23cd68) at block/qcow2-cluster.c:1552 #5 0x00007f8b55b1eff9 in qcow2_expand_zero_clusters (bs=bs@entry=0x7f8b578e3400) at block/qcow2-cluster.c:1699 #6 0x00007f8b55b25a28 in qcow2_downgrade (target_version=2, bs=0x7f8b578e3400) at block/qcow2.c:2137 #7 qcow2_amend_options (bs=0x7f8b578e3400, options=<optimized out>) at block/qcow2.c:2221 #8 0x00007f8b55b5ca10 in img_amend (argc=<optimized out>, argv=<optimized out>) at qemu-img.c:2754 #9 0x00007f8b53b41af5 in __libc_start_main () from /lib64/libc.so.6 #10 0x00007f8b55b08c2d in _start () (gdb)