Hey all 👋
After upgrading to the latest 9.2.18.0 we started experiencing this weird error. It happens only when using the JRUBY_OPTS="--dev" flag. Let me know if you need any extra details to help with the investigation.

Environment Information

• JRuby 9.2.18.0
• JRUBY_OPTS="--dev"

Expected Behavior
getsockopt works

Actual Behavior
When using JRUBY_OPTS=--dev getsockopt crashes with the following stacktrace

Traceback (most recent call last): 16: from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:85) 15: from org.jruby.RubyKernel$INVOKER$s$0$3$eval.call(RubyKernel$INVOKER$s$0$3$eval.gen) 14: from org.jruby.RubyKernel.eval(RubyKernel.java:1048) 13: from org.jruby.RubyKernel.evalCommon(RubyKernel.java:1086) 12: from org.jruby.ir.interpreter.Interpreter.evalWithBinding(Interpreter.java:182) 11: from org.jruby.ir.interpreter.Interpreter.evalCommon(Interpreter.java:158) 10: from org.jruby.ir.interpreter.Interpreter.INTERPRET_EVAL(Interpreter.java:106) 9: from org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:72) 8: from org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:325) 7: from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:206) 6: from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:397) 5: from org.jruby.ext.socket.RubyBasicSocket$INVOKER$i$2$0$getsockopt.call(RubyBasicSocket$INVOKER$i$2$0$getsockopt.gen) 4: from org.jruby.ext.socket.RubyBasicSocket.getsockopt(RubyBasicSocket.java:430) 3: from com.sun.proxy.$Proxy30.getsockoptInt(Unknown Source) 2: from jnr.ffi.provider.NativeInvocationHandler.invoke(NativeInvocationHandler.java:47) 1: from jnr.ffi.provider.jffi.DefaultInvokerFactory$FunctionNotFoundInvoker.invoke(DefaultInvokerFactory.java:465) Java::JavaLang::UnsatisfiedLinkError (native method 'getsockoptInt' not found for method public default int org.jruby.ext.socket.RubyBasicSocket$LibC.getsockoptInt(int,int,int,java.nio.ByteBuffer,jnr.ffi.byref.IntByReference))

How to reproduce
Using the latest JRuby image run the following snippet

require "socket"
puts(JRUBY_VERSION) # to make sure it's 9.2.18.0
s = TCPServer.new(2560)
s.getsockopt(Socket::IPPROTO_TCP, Socket::TCP_INFO) # this is where it crashes

Using irb:

docker run -it jruby:9.2.18.0 bin/bash
JRUBY_OPTS="--dev" irb
require "socket"
puts(JRUBY_VERSION) # to make sure it's 9.2.18.0
s = TCPServer.new(2560)
s.getsockopt(Socket::IPPROTO_TCP, Socket::TCP_INFO) # this is where it crashes

Watch it crash.