Hello, dear list, allow me another stupid question: I want to go into MacRuby's guts, and throw gdb at it. Attempting to look at issue #753, I did the naive thing: % gdb macruby (gdb) break dispatcher.cpp:1343 The answer here was: "No symbol table is loaded. Use the "file" command. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (dispatcher.cpp:1343) pending." Question 1: Do I need to build MacRuby differently to get a symbol file? Or is it just hidden away somewhere? When I continue: (gdb) run test_webrick.rb After a while, what I get is: [2010-07-09 19:42:21] ERROR Errno::EINTR: Interrupted system call - select(2) failed /Library/Frameworks/MacRuby.framework/Versions/0.7/usr/lib/ruby/1.9.2/webrick/server.rb:83:in `block' Which is way off from the error I would expect. If I do not try to set a breakpoint, I get the expected console output ("Assertion failed: ((b->flags & flags) == flags), function rb_vm_prepare_block, file dispatcher.cpp, line 1343."), and a SIGABRT. The backtrace looks, well, not really nice. Question 2: Am I even approaching this right? Or do I need to take special precautions? Thanks a lot Alex