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+qemu-io: Failure on a qcow2 image with the fuzzed refcount table
+
+'qemu-io -c write' and 'qemu-io -c aio_write' crashes on a qcow2 image with a fuzzed refcount table.
+
+Sequence:
+ 1. Unpack the attached archive, make a copy of test.img
+ 2. Put copy.img and backing_img.file in the same directory
+ 3. Execute
+    qemu-io copy.img -c write 279552 322560
+                      or
+   qemu-io copy.img -c aio_write 836608 166400
+
+Result: qemu-io was killed by SIGIOT with the reason:
+
+qemu-io: block/qcow2-cluster.c:1291: qcow2_alloc_cluster_offset: Assertion `*host_offset != 0' failed.
+
+qemu.git HEAD 69f87f713069f1f
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