diff --git a/spec/mspec/lib/mspec/runner/actions/timeout.rb b/spec/mspec/lib/mspec/runner/actions/timeout.rb
index c85bf49ad3..fd5578be87 100644
--- a/spec/mspec/lib/mspec/runner/actions/timeout.rb
+++ b/spec/mspec/lib/mspec/runner/actions/timeout.rb
@@ -36,8 +36,21 @@ class TimeoutAction
             elapsed = now - @started
             if elapsed > @timeout
               STDERR.puts "\n#{@current_state.description}"
+              STDERR.puts "Example took longer than the configured timeout of #{@timeout}s"
               STDERR.flush
-              abort "Example took longer than the configured timeout of #{@timeout}s"
+
+              if RUBY_ENGINE == 'truffleruby'
+                STDERR.puts 'Java stacktraces:'
+                Process.kill :SIGQUIT, Process.pid
+                sleep 1
+
+                if defined?(Truffle::Debug.show_backtraces)
+                  STDERR.puts "\nRuby backtraces:"
+                  Truffle::Debug.show_backtraces
+                end
+              end
+
+              exit 2
             end
           end
         end
diff --git a/spec/mspec/tool/sync/sync-rubyspec.rb b/spec/mspec/tool/sync/sync-rubyspec.rb
index b4c79d2afc..13f1d8004d 100644
--- a/spec/mspec/tool/sync/sync-rubyspec.rb
+++ b/spec/mspec/tool/sync/sync-rubyspec.rb
@@ -20,7 +20,7 @@ IMPLS = {
 
 MSPEC = ARGV.delete('--mspec')
 
-CHECK_LAST_MERGE = ENV['CHECK_LAST_MERGE'] != 'false'
+CHECK_LAST_MERGE = !MSPEC && ENV['CHECK_LAST_MERGE'] != 'false'
 TEST_MASTER = ENV['TEST_MASTER'] != 'false'
 
 MSPEC_REPO = File.expand_path("../../..", __FILE__)