[Bro] Bro SMB and segfaulting

Mike Reeves luke at geekempire.com
Fri Dec 19 07:52:52 PST 2014

Hey all! 

	I compiled Vlad’s topic from github to try it out. It runs fine on low speed environments but when I drop it on a high speed sensor it blows up. The link the sensor is on runs at between 600Mbit and 2.5Gbit. When I was doing the testing it was running at around 700Mbit and 1.7M PPS. Normal Bro 2.3.1 runs fine with no traffic being dropped at the ring. I am running pf_ring vanilla. The box runs 1 manager, 2 proxies, and 10 workers. The box is a dual 10 core HT with 128GB of RAM. All workers are pinned to real processors. The sensor starts and begins writing logs and then the disk IO goes to 100% and stops writing. It also starts dropping packets from the ring immediatly. Then the workers segfault and I have to stop it because when they go into crazy town they tie up the disk IO. The conn log and the syslog.log are much larger than the smb logs. I tried turning off logging on some of the other busy log files in case it is a disk IO problem. It didn’t make a difference. I write a LOT of logs on normal 2.3.1 and the IO usage is ver low.

Has anyone had any luck running the SMB analyzer on high a high speed link? Is there anything I can provide to help figure out the root cause? 



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