smb-enum-services script broken?

[Stefan-mcp]

fired against a windows 2k8 (metasploitable 3) this is generating the below error

_NSE: Starting smb-enum-services against 10.0.2.6:139.
NSE: Starting smb-enum-services against 10.0.2.6:445.
NSE: [smb-enum-services 10.0.2.6:139] SMB: Added account '' to account list
NSE: [smb-enum-services 10.0.2.6:139] SMB: Added account 'guest' to account list
NSE: [smb-enum-services 10.0.2.6:139] SMB: Extended login to 10.0.2.6 as VAGRANT-2008R2\guest failed (NT_STATUS_ACCOUNT_DISABLED)
NSE: smb-enum-services against 10.0.2.6:139 threw an error!
/usr/local/bin/../share/nmap/nselib/smb.lua:1971: bad argument #5 to 'pack' (number expected, got nil)
stack traceback:
[C]: in function 'string.pack'
/usr/local/bin/../share/nmap/nselib/smb.lua:1971: in function 'smb.write_file'
/usr/local/bin/../share/nmap/nselib/msrpc.lua:270: in function 'msrpc.bind'
/usr/local/bin/../share/nmap/scripts/smb-enum-services.nse:865: in function </usr/local/bin/../share/nmap/scripts/smb-enum-services.nse:857>
(...tail calls...)

NSE: smb-enum-services against 10.0.2.6:445 threw an error!
/usr/local/bin/../share/nmap/nselib/smb.lua:1971: bad argument #5 to 'pack' (number expected, got nil)
stack traceback:
[C]: in function 'string.pack'
/usr/local/bin/../share/nmap/nselib/smb.lua:1971: in function 'smb.write_file'
/usr/local/bin/../share/nmap/nselib/msrpc.lua:270: in function 'msrpc.bind'
/usr/local/bin/../share/nmap/scripts/smb-enum-services.nse:865: in function </usr/local/bin/../share/nmap/scripts/smb-enum-services.nse:857>
(...tail calls...)_

fired against a linux (metasploitable2) is runs for about 7mins, looking in debug like its perhaps stuck in a loop, than ulitmately returns an error in the result as below

139/tcp open netbios-ssn syn-ack ttl 64
| smb-enum-services:
| ERROR: SMB: ERROR: Server returned less data than needed for header
445/tcp open microsoft-ds syn-ack ttl 64
| smb-enum-services:
|_ ERROR: SMB: ERROR: Server returned less data than needed for header
MAC Address: 08:00:27:A9:C5:6B (Oracle VirtualBox virtual NIC)_

[cldrn]

I believe this and all the recent weird pack/unpack errors are caused by some other issue that is making nsock not return the complete packet.

Can you try using older versions to check if the problem is gone?

[Stefan-mcp]

I tried in 7.8 kali repo version, 7.8svn and 7.4 from the nmap site and found the same outcome. Not sure if that's crossing any nsock versions