Nmap Development: Script Engine scanning getting stuck in loop

["Alex Jurkiewicz" <alex_j () iinet net au>]

Hi All,

 

I've run into an issue with the script engine while scanning a host, it gets
stuck in an infinite loop.

Running nmap-4.53 on Centos5. I've compiled it from source with default
options.

 

# nmap -A -v -p1-65535 -vvv HOSTNAME.COM | tee nmap.log

 

At a certain point during the scanning it just begins to loop:

[.]

NSOCK (485.4790s) nsock_loop() started (timeout=50ms). 0 events pending

NSOCK (485.4790s) nsock_loop() started (timeout=50ms). 0 events pending

NSOCK (485.4790s) nsock_loop() started (timeout=50ms). 0 events pending

Stats: 0:08:05 elapsed; 0 hosts completed (1 up), 1 undergoing Script Scan

Active NSE scripts: 102

SCRIPT ENGINE Timing: About 17.74% done; ETC: 23:15 (0:03:14 remaining)

NSOCK (485.4800s) nsock_loop() started (timeout=50ms). 0 events pending

NSOCK (485.4800s) nsock_loop() started (timeout=50ms). 0 events pending

NSOCK (485.4800s) nsock_loop() started (timeout=50ms). 0 events pending

[.]

SCRIPT ENGINE Timing: About 17.74% done; ETC: 23:18 (0:05:56 remaining)

^C

 

While this is happening nmap seems to be continually pouring out the above
`0 events pending` line. After the 5 minute test above I had a 100 000 line
logfile. I trimmed it and attached it to this mail:

$ cat nmap.log | grep --context=10 -v "nsock_loop() started (timeout=50ms).
0 events pending" >> nmap2.log

 

Let me know if I can provide more info.

 

Cheers,

Alex

Attachment: nmap2.log.gz
Description:

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