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qemu-io: the 'map' command hangs on the fuzzed image
Sequence:
1. Unpack the attached archive, make a copy of test.img
2. Put copy.img and backing_img.vdi in the same directory
3. Execute
qemu-io copy.img -c map
Result: qemu-io processes part of the image and then hangs loading 100% of CPU time.
qemu.git HEAD 2d591ce2aeebf
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