Description of problem: 'qemu-img map' for a image image over NBD fails. Version-Release number of selected component (if applicable): qemu-kvm-3.1.0-20.module+el8+2904+e658c755 kernel-4.18.0-80.el8 How reproducible: 2/2 Steps to Reproduce: 1.Create a image file and export it by NBD # qemu-img create -f raw test.img 512M Formatting 'test.img', fmt=raw size=536870912 # qemu-nbd -f raw -p 9000 test.img -t 2. Dump the metadata of the image # qemu-img map nbd:localhost:9000 Actual results: Client: # qemu-img map nbd:localhost:9000 Offset Length Mapped to File qemu-img: File contains external, encrypted or compressed clusters. Server: # qemu-nbd -f raw -p 9000 test.img -t Disconnect client, due to: Unexpected end-of-file before all bytes were read Expected results: Dump the metadata successfully, and there is no error info from the server. Additional info:
Tried to verify this bug as below: Tested with: qemu-kvm-4.1.0-1.module+el8.1.0+3966+4a23dca1 kernel-4.18.0-134.el8 Steps: In Server: # qemu-img create -f raw test.img 512M # qemu-nbd -f raw -p 9000 test.img -t In client: Map with default/human # qemu-img map nbd:localhost:9000 Offset Length Mapped to File Map with json # qemu-img map nbd:localhost:9000 --output=json [{ "start": 0, "length": 536870912, "depth": 0, "zero": true, "data": true, "offset": 0}] Results: In server, there is no error info anymore. # qemu-nbd -f raw -p 9000 test.img -t In client, like above.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:3723