Description of problem：
Pop up assertion error in vddk-remote connection after executing cmd 'nbdinfo --map nbd://localhost'

Version-Release number of selected component (if applicable):
nbdkit-1.38.5-9.el9.x86_64
libnbd-1.20.3-4.el9.x86_64

How reproducible:
100%

Steps:
1.Pop up assertion error in vddk-remote connection after executing cmd 'nbdinfo --map nbd://localhost'

# ./vddk-remote  -r -c 'vpx://non-admin%40vsphere.local@10.73.212.129/data/10.73.212.36/?no_verify=1' --password=/home/passwd --libdir=/home/vddk8.0.3 --thumbprint=CB:9F:B1:9D:33:49:6C:60:AD:3C:A5:16:77:91:5F:CD:1B:24:B1:43 test-thin-provision  --filter=blocksize minblock=512 
nbdkit: ../../server/backend.c:814: backend_extents: Assertion `backend_valid_range (c, offset, count)' failed. 

Actual result:
As above description

Expect result:
Fix the bug

Additional info