[PATCH 1/2] test_fiber: show crash on GC after forking

[Eric Wong <e@80x24.org>]

But the management of stacks for root fiber and regular
fibers is different and confusing.  Perhaps unifying
thread and fiber stack cache is the best way to go.

Is a separate class of stacks even necessary?
We should aim to minimize use of stack space.

"[BUG] Illegal root fiber parameter"
---
 test/ruby/test_fiber.rb | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_fiber.rb b/test/ruby/test_fiber.rb
index c835246fda..d481117259 100644
--- a/test/ruby/test_fiber.rb
+++ b/test/ruby/test_fiber.rb
@@ -271,7 +271,16 @@ def test_fork_from_fiber
     assert_nothing_raised(bug5700) do
       Fiber.new do
         pid = fork do
-          Fiber.new {}.transfer
+          Fiber.new {
+            pid = fork do
+              10000.times do
+                Fiber.new {}.transfer
+                f2 = Fiber.new {
+                  Fiber.yield
+                }
+              end
+            end
+          }.transfer
         end
       end.resume
     end
-- 
EW