Port on downstream server gets corrupted

[zeha]

• Program: dnsdist
• Issue type: Bug report

Short description

After a while - multiple days with heavy load - the port part of a random server as shown in showServers() changes to a random value. This is not just a cosmetic issue, we've verified that the port is actually tried.

Environment

• Operating system: CentOS Linux 7 (Core)
• Software version: 9242205 + custom patch (code available)
• Software source: compiled

Steps to reproduce

Unclear :(

Other information

I'm filing this here so we don't forget about it. Might very well be a bug in the patch, but very hard to say.

[rgacogne]

I would be interested in seeing the patch because it's the first time I ever hear about that kind of issue in dnsdist.

[zeha]

Patched tree is at https://github.com/zeha/pdns/tree/dnsdist-named-caches-rebased-20180324

While maybe the patch is not super nice, I doubt somehow that it's the source of this problem. The only thing that appears to get corrupted is one of the downstream server ports. Needs quite some time/traffic for this to show up.

[rgacogne]

Would you happen to know if that still happens on recent builds?

[zeha]

Customer feedback: apparently gone now.