Another go at fixing that native crash, better luck this time?

src/main/resources/assets/opencomputers/loot/OpenOS/boot/01_os.lua

@@ -10,7 +10,7 @@ local env = {
   MANPATH="/usr/man:.",
   PAGER="/bin/more",
   PATH="/bin:/usr/bin:/home/bin:.",
-  PS1="# ",
+  PS1="$PWD# ",
   PWD="/",
   SHELL="/bin/sh",
   TMP="/tmp", -- Depricated

src/main/resources/assets/opencomputers/lua/kernel.lua

@@ -306,7 +306,9 @@ local userdataWrapper = {
     return processResult(table.pack(userdata.call(wrappedUserdata[self], processArguments(...))))
   end,
   __gc = function(self)
-    userdata.dispose(wrappedUserdata[self])
+    local data = wrappedUserdata[self]
+    wrappedUserdata[self] = nil
+    userdata.dispose(data)
   end,
   -- This is the persistence protocol for userdata. Userdata is considered
   -- to be 'owned' by Lua, and is saved to an NBT tag. We also get the name
@@ -350,7 +352,7 @@ function wrapSingleUserdata(data)
   for k, v in pairs(wrappedUserdata) do
     -- We need a custom 'equals' check for userdata because metamethods on
     -- userdata introduced by JNLua tend to crash the game for some reason.
-    if userdata.equal(v, data) then
+    if v == data then
       return k
     end
   end

src/main/scala/li/cil/oc/common/tileentity/Robot.scala

@@ -202,7 +202,7 @@ class Robot(val isRemote: Boolean) extends traits.Computer with traits.PowerInfo
 
   def isAnimatingTurn = animationTicksLeft > 0 && turnAxis != 0
 
-  def animateSwing(duration: Double) = {
+  def animateSwing(duration: Double) = if (items(0).isDefined) {
     setAnimateSwing((duration * 20).toInt)
     ServerPacketSender.sendRobotAnimateSwing(this)
   }

src/main/scala/li/cil/oc/server/component/machine/luac/UserdataAPI.scala

@@ -103,14 +103,6 @@ class UserdataAPI(owner: NativeLuaArchitecture) extends NativeLuaAPI(owner) {
     })
     lua.setField(-2, "doc")
 
-    lua.pushScalaFunction(lua => {
-      val value1 = lua.toJavaObjectRaw(1)
-      val value2 = lua.toJavaObjectRaw(2)
-      lua.pushBoolean(value1.isInstanceOf[Value] && value2.isInstanceOf[Value] && value1 == value2)
-      1
-    })
-    lua.setField(-2, "equal")
-
     lua.setGlobal("userdata")
   }
 }

src/main/scala/li/cil/oc/server/component/machine/luaj/UserdataAPI.scala

@@ -59,12 +59,6 @@ class UserdataAPI(owner: LuaJLuaArchitecture) extends LuaJAPI(owner) {
       owner.documentation(() => machine.documentation(value, method))
     })
 
-    userdata.set("equal", (args: Varargs) => {
-      val value1 = args.checkuserdata(1, classOf[Value])
-      val value2 = args.checkuserdata(2, classOf[Value])
-      LuaValue.valueOf(value1.isInstanceOf[Value] && value2.isInstanceOf[Value] && value1 == value2)
-    })
-
     lua.set("userdata", userdata)
   }
 }