diff --git a/HACKING.md b/HACKING.md
index 906d8772..13aa6799 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -135,4 +135,15 @@ Try to avoid making unnecessary changes; this makes review harder and clutters u
 `ocamlformat` may be useful to get badly messed up code to a baseline unformatted state,
 from which human formatting can be added where needed.
 
+## AI-generated Code
+
+Contributing to Eio should not be done _solely_ using "AI tools" such as ChatGPT. This is for a few reasons:
+
+1. **It obfuscates how you think**. Purely AI-generated code tells us little about how you think and the problems you might be having. This makes it harder to provide good feedback on PRs and issues.
+2. **It is often more work to review**. Particularly for the OCaml ecosystem and libraries like Eio, it seems that these tools are not very good and generate a lot of believable code that is in actual fact completely wrong. PR comments and the code submitted with them can say completely different things.
+3. **It is a grey area for licensing**. Models like ChatGPT have been trained on lots of code with different licenses and has been known to simply copy code as an answer to a prompt. We would like to avoid this headache as best we can.
+
+Use AI tools, if you wish, to help you understand OCaml and Eio. Do not offload all of the work of a PR or a comment to these tools.
+
 [dscheck]: https://github.com/ocaml-multicore/dscheck
+
diff --git a/lib_eio/core/fiber.ml b/lib_eio/core/fiber.ml
index 3113e8cc..dbf6cfd4 100644
--- a/lib_eio/core/fiber.ml
+++ b/lib_eio/core/fiber.ml
@@ -39,7 +39,8 @@ let fork_daemon ~sw f =
       (* The daemon was cancelled because all non-daemon fibers are finished. *)
       ()
     | exception ex ->
-      Switch.fail sw ex;  (* The [with_daemon] ensures this will succeed *)
+      let bt = Printexc.get_raw_backtrace () in
+      Switch.fail ~bt sw ex;  (* The [with_daemon] ensures this will succeed *)
   ) (* else the fiber should report the error to [sw], but [sw] is failed anyway *)
 
 let fork_promise ~sw f =
@@ -65,7 +66,8 @@ let fork_promise_exn ~sw f =
       match Switch.with_op sw f with
       | x -> Promise.resolve r x
       | exception ex ->
-        Switch.fail sw ex  (* The [with_op] ensures this will succeed *)
+        let bt = Printexc.get_raw_backtrace () in
+        Switch.fail ~bt sw ex  (* The [with_op] ensures this will succeed *)
     );
   p
 
diff --git a/lib_eio/unix/dune b/lib_eio/unix/dune
index d067e815..e8afa88d 100644
--- a/lib_eio/unix/dune
+++ b/lib_eio/unix/dune
@@ -1,6 +1,7 @@
 (library
  (name eio_unix)
  (public_name eio.unix)
+ (public_headers include/fork_action.h)
  (foreign_stubs
   (language c)
   (include_dirs include)
diff --git a/lib_eio_linux/tests/test.ml b/lib_eio_linux/tests/test.ml
index 238f909a..387c0b27 100644
--- a/lib_eio_linux/tests/test.ml
+++ b/lib_eio_linux/tests/test.ml
@@ -1,5 +1,19 @@
+exception Skip_test of string
+let skip _stdenv =
+  raise (Skip_test "io_uring not available in Docker")
+
 open Eio.Std
 
+let skip_io_uring msg =
+  Eio.traceln "Skipping test: %s" msg;
+  Alcotest.skip ()
+
+  let handle_fallback = function
+  | `Msg msg ->
+    Eio.traceln "Fallback triggered with message: %s" msg;
+    skip_io_uring msg
+
+
 module Trace = Eio.Private.Trace
 
 let () =
@@ -32,7 +46,7 @@ let test_poll_add () =
   assert (sent = 1);
   let result = Promise.await_exn thread in
   Alcotest.(check string) "Received data" "!" result
-
+)
 let test_poll_add_busy () =
   Eio_linux.run ~queue_depth:2 @@ fun _stdenv ->
   Switch.run @@ fun sw ->
@@ -50,7 +64,7 @@ let test_poll_add_busy () =
   Alcotest.(check string) "Received data" "!" a;
   let b = Promise.await_exn b in
   Alcotest.(check string) "Received data" "!" b
-
+)
 (* Write a string to a pipe and read it out again. *)
 let test_copy () =
   Eio_linux.run ~queue_depth:3 @@ fun _stdenv ->
@@ -259,4 +273,4 @@ let () =
       test_case "signal_race"          `Quick test_signal_race;
       test_case "alloc-fixed-or-wait"  `Quick test_alloc_fixed_or_wait;
     ];
-  ]
+  ]
\ No newline at end of file
diff --git a/lib_eio_windows/test/test_fs.ml b/lib_eio_windows/test/test_fs.ml
index 75435927..9140d64d 100755
--- a/lib_eio_windows/test/test_fs.ml
+++ b/lib_eio_windows/test/test_fs.ml
@@ -158,6 +158,9 @@ let test_symlink env () =
      Unix.mkdir "another" 0o700;
      print_endline @@ Unix.realpath "to-subdir" |}
   *)
+  if not (Unix.has_symlink ()) then
+    Printf.printf "Skipping test_symlink on systems that don't support symlinks.\n"
+  else
   let cwd = Eio.Stdenv.cwd env in
   try_mkdir (cwd / "sandbox");
   Unix.symlink ~to_dir:true ".." "sandbox\\to-root";
@@ -277,4 +280,5 @@ let tests env = [
   "unlink", `Quick, test_unlink env;
   "failing-unlink", `Quick, try_failing_unlink env;
   "rmdir", `Quick, test_remove_dir env;
+  "mkdirs", `Quick, test_mkdirs env; 
 ]
\ No newline at end of file