[Libguestfs] nbdkit crashes on attempt to retrieve extent with len of 2^32-1

nbdkit crashes when the client is trying to get extents with len=2^32-1. Here is client code (nbdsh): h.add_meta_context("base:allocation") h.connect_uri("nbd://localhost:10809/disk0-flat.vmdk") def f(metacontext, offset, e, status): print(e) h.block_status(2**32-2, 0, f) [4294967295, 0] <--- OK h.block_status(2**32-1, 0, f) <-- FAIL Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/lib64/python3.12/site-packages/nbd.py", line 2775, in block_status return libnbdmod.block_status(self._o, count, offset, extent, flags) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ nbd.Error: nbd_block_status: block-status: command failed: Transport endpoint is not connected (ENOTCONN) Server prints: nbdkit: file.8: debug: file: extents count=4294967295 offset=0 req_one=0 nbdkit: ../../server/protocol.c:505: extents_to_block_descriptors: Assertion `e.length <= length' failed. Aborted (core dumped) Why 2^32-2 is max len, and why nbdkit crashes with 2**32-1? It seems like a bad-behaviour client can crash the server. Or did I miss something? -- +380979184774 Mykola Ivanets