Re: Lua 5.2: "error in __gc metamethod (bad argument #1 to '?' (dnet expected, got userdata))"

[Patrick Donnelly <batrick () batbytes com>]

On Mon, May 28, 2012 at 4:57 PM, David Fifield <david () bamsoftware com> wrote:
> I'm getting a reproducible error:
>
> ./nmap --script broadcast-ping -d
>
> Starting Nmap 6.01 ( http://nmap.org ) at 2012-05-28 13:50 PDT
> PORTS: Using top 1000 ports found open (TCP:1000, UDP:0, SCTP:0)
> --------------- Timing report ---------------
>  hostgroups: min 1, max 100000
>  rtt-timeouts: init 1000, min 100, max 10000
>  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
>  parallelism: min 0, max 0
>  max-retries: 10, host-timeout: 0
>  min-rate: 0, max-rate: 0
> ---------------------------------------------
> NSE: Loaded 1 scripts for scanning.
> NSE: Script Pre-scanning.
> NSE: Starting runlevel 1 (of 1) scan.
> NSE: Starting broadcast-ping.
> Initiating NSE at 13:50
> NSE: Finished broadcast-ping.
> NSE: Finished broadcast-ping.
> Completed NSE at 13:50, 3.12s elapsed
> NSE: Script Engine Scan Aborted.
> An error was thrown by the engine: error in __gc metamethod (bad argument #1 to '?' (dnet expected, got userdata))
> Pre-scan script results:
> | broadcast-ping:
> |   IP: 192.168.0.4    MAC: 3c:07:54:09:f1:de
> |   IP: 192.168.0.190  MAC: 00:16:cb:ae:d4:ac
> |_  Use --script-args=newtargets to add the results as targets
> NSE: Script Post-scanning.
> NSE: Starting runlevel 1 (of 1) scan.
> Read from /home/david/nmap-git: nmap-services.
> WARNING: No targets were specified, so 0 hosts scanned.
> Nmap done: 0 IP addresses (0 hosts up) scanned in 3.17 seconds
>           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)
>
> This is happening since the Lua 5.2 change. Reverting back to r28685
> makes it go away.

This should be fixed in 28735.

> Once, I saw this slightly different error:
> nse_restore: WAITING_TO_RUNNING error!
> error in __gc metamethod (bad argument #1 to '?' (dnet expected, got userdata))

Because it's an error in a __gc metamethod, it can occur anywhere at
anytime. So this isn't something to worry about.

-- 
- Patrick Donnelly
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