HTTP::Server stopped working for me since 0.20.3

[ctxcode]

Error:

setsockopt: Invalid argument (Errno)
0x473aa7: *CallStack::unwind:Array(Pointer(Void)) at ??
0x473a3a: *CallStack#initialize:Array(Pointer(Void)) at ??
0x473a0a: *CallStack::new:CallStack at ??
0x46aa0e: *raise<Errno>:NoReturn at ??
0x52f92e: *TCPServer at ??
0x52f893: *TCPServer at ??
0x52f825: *TCPServer at ??
0x52f951: *TCPServer at ??
0x52e3d8: *TCPServer#initialize<String, Int32, Int32, Nil>:Nil at ??
0x52db41: *TCPServer#initialize<String, Int32>:Nil at ??
0x52daf3: *TCPServer::new<String, Int32>:TCPServer at ??
0x525eec: *HTTP::Server#bind:TCPServer at ??
0x525e1a: *HTTP::Server#listen:Nil at ??
0x4600a5: ??? at ??
0x46e249: main at ??
0x7fce6d601f45: __libc_start_main at ??
0x45f7a9: ??? at ??
0x0: ??? at ??

Any idea why? I'm using "Bash on Ubuntu on Windows", i used the basic example from the website. It used to work on previous versions.
( Sidenote: Compile time improved alot! 👍 )

[ysbaddaden]

What platform are you using? If Linux, which kernel version?

Maybe we should rescue self.reuse_port = true since it may fail on some platforms.

[ctxcode]

Ubuntu 14.04.5 LTS
Linux version 3.4.0-Microsoft (Microsoft@Microsoft.com) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Wed Dec 31 14:42:53 PST 2014

[ysbaddaden]

Bingo. SO_REUSEPORT is only available in Linux 3.9 and onwards. I'll patch this.

[Svenskunganka]

I am able to reproduce this issue on a 4.4 kernel on WSL:

Linux version 4.4.0-43-Microsoft (Microsoft@Microsoft.com) (gcc version 5.4.0 (GCC) ) #1-Microsoft Wed Dec 31 14:42:53 PST 2014

Disabling reuseport works as expected. More info here: microsoft/WSL#1419
I don't think there's anything we can do about it, but just thought I'd add this here for any future users that has the same issue. If you're using Amber for example, you can disable it for your dev environment by adding port_reuse: false to config/environments/development.yml, which will keep it enabled for when you deploy but disabled during development.