# Ruby hangs on OSX **URL:** \ **Category:** Ruby\ **Created:** [November 22, 2006, 3:40pm UTC](https://www.ruby-forum.com/t/ruby-hangs-on-osx/76934 "2006-11-22T15:40:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Mariano\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/eada6e/32.png) [@Mariano\_K](https://www.ruby-forum.com/u/Mariano_K)\ **Post date:** [November 22, 2006, 3:40pm UTC](https://www.ruby-forum.com/t/ruby-hangs-on-osx/76934/1 "2006-11-22T15:40:42Z")
Hi, I encountered a strange problem. When running “ruby soduku\_test.rb -n test\_next\_cell” the process hangs and eats up all of the assigned CPU . I have no idea why that is … I asked a friend to run it on windows and it does work there. The program yield in a stack overflow. I recently reinstalled my computer and used darwinports. I don’t think that I’ve seen that problem before. I also reinstalled ruby again, but with not much success and the same thing happens on another Mac too. Installing ruby the way I used to do it before, using the hivelogic tutorial, also didn’t work. That are the versions that fail: ruby 1.8.5 (2006-08-25) [i686-darwin8.8.3] # darwin ports 1.3.1, gcc 4.0 ruby 1.8.4 (2005-12-24) [i686-darwin8.8.3] # directly from the sources (hivelogic tutorial) ruby 1.8.2 (2004-12-25) [universal-darwin8.0] # comes with Tiger Both Macs (MB C2D, MBP CD) are running OSX 10.4.8 with all updates. uname -v: Darwin Kernel Version 8.8.3: Wed Oct 18 21:57:10 PDT 2006; root:xnu-792.15.4.obj~4/RELEASE\_I386 A stack trace of the “working” run on Windows is below this mail. I attached the code. Unfortunately I haven’t been able to isolate the problem, but at least the code consistently fails. Any ideas? Can somebody please try it out on another Mac? I will also do that later on. Cheers, Mariano ---
**Author:** ![Mariano\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/eada6e/32.png) [@Mariano\_K](https://www.ruby-forum.com/u/Mariano_K)\ **Post date:** [November 23, 2006, 11:12pm UTC](https://www.ruby-forum.com/t/ruby-hangs-on-osx/76934/2 "2006-11-23T23:12:08Z")
Hi, still not sure what the problem really is about. As nobody answered I assume this is something with my two described fresh installs? Anyway … What I found is that reducing the stack size from 8192 to 4096 with “ulimit -s 4096” it works. I get the stacklevel too deep error. Now I am wondering what the “right” value and why is nobody else hitting that wall? Cheers, Mariano ---
**Author:** ![Mariano\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/eada6e/32.png) [@Mariano\_K](https://www.ruby-forum.com/u/Mariano_K)\ **Post date:** [November 24, 2006, 12:51pm UTC](https://www.ruby-forum.com/t/ruby-hangs-on-osx/76934/3 "2006-11-24T12:51:32Z")
Btw. The strange behaviour is not limited to stack overflows. I also see now an interesting style of error reporting: localhost:~//code/sudoku mkamp$ ruby sudoku\_tests.rb sudoku\_tests.rb:231: warning: parenthesize argument(s) for future version sudoku\_tests.rb:232: warning: parenthesize argument(s) for future version Loaded suite sudoku\_tests Started …E…E…EEE.type: code total: 150, empty: 28, code: 103, comment: 19 type: test total: 286, empty: 59, code: 222, comment: 5 . Finished in 0.052318 seconds. ^C 1) Error: test\_empty(SudokuTests): NameError: undefined local variable or method `possible' for # ./sudoku.rb:74:in`solve’ sudoku\_tests.rb:125:in `test\_empty’ ^C 2) Error: test\_michl(SudokuTests): NameError: undefined local variable or method `possible' for # ./sudoku.rb:74:in`solve’ sudoku\_tests.rb:119:in `test\_michl’ ^C 3) Error: test\_solve(SudokuTests): NameError: undefined local variable or method `possible' for # ./sudoku.rb:74:in`solve’ sudoku\_tests.rb:15:in `test\_solve’ ^C 4) Error: test\_solve\_with\_canned\_complex\_solution(SudokuTests): NameError: undefined local variable or method `possible' for # ./sudoku.rb:74:in`solve’ sudoku\_tests.rb:262:in `solve_and_compare' sudoku_tests.rb:97:in`test\_solve\_with\_canned\_complex\_solution’ ^C 5) Error: test\_solve\_with\_canned\_simple\_solution(SudokuTests): NameError: undefined local variable or method `possible' for # ./sudoku.rb:74:in`solve’ sudoku\_tests.rb:262:in `solve_and_compare' sudoku_tests.rb:47:in`test\_solve\_with\_canned\_simple\_solution’ 14 tests, 50 assertions, 0 failures, 5 errors I have to press CTRL+C many times to end the program otherwise it hangs and eats my CPU. Any ideas? Any? Btw. I tried to recompile ruby without -O2 in the CFLAGS, but that didn’t change a thing except a 50% performance penality. Cheers, Mariano ---
**Author:** ![Mariano\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/eada6e/32.png) [@Mariano\_K](https://www.ruby-forum.com/u/Mariano_K)\ **Post date:** [November 27, 2006, 1:52am UTC](https://www.ruby-forum.com/t/ruby-hangs-on-osx/76934/4 "2006-11-27T01:52:18Z")
Hi Mariano, Interestingly, the program you’ve sent around works for me on my G4 Powerbook using Ruby 1.8.4 built using Fink (same stack size you quoted as well) - however I see the same problems you’ve described when running the script under Linux (Debian testing, Ruby 1.8.4) and on my Intel iMac at home (same environment & compiler as the G4, just different architecture). Looks like it’s a cross platform problem. Anyone have any ideas what might be wrong or what other info we could send in to help diagnose it with? Cheers, Marcus