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qemu-io: Assert failure on the fuzzed qcow2 image
'qemu-io -c write' failed on the fuzzed image with missed refcount tables:
Sequence:
1. Unpack the attached archive, make a copy of test.img
2. Put copy.img and backing_img.cow in the same directory
3. Execute
qemu-io copy.img -c 'write 2856960 208896'
Result: qemu-io was killed by SIGIOT with the reason:
qemu-io: block/qcow2-cluster.c:910: handle_copied: Assertion `*host_offset == 0
|| offset_into_cluster(s, guest_offset) == offset_into_cluster(s, *host_offset)'
failed.
qemu.git HEAD 2d591ce2aeebf
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