Summary: Sometimes while I'm debugging a project in Xcode, the debugger will crash/exit. Steps to Reproduce: 1. Clean install Mac OS X 10.5.5. 2. Install Xcode 3.1.1. 3. Launch Xcode 4. Open project. 5. Set some breakpoints. 6. Debug. Expected Results: The debugger doesn't crash. ;-) Actual Results: The debugger stops, and in the debugger console I get the message, "The Debugger has exited due to signal 10 (SIGBUS).The Debugger has exited due to signal 10 (SIGBUS)." Regression: This has occurred on two different machines, an Intel Core Duo iMac and an Intel Core 2 Duo MacBook Pro, each running OS X 10.5.5 and Xcode 3.1.1. On both machines, it crashes at the exact same point in both the debugger and in my source code. Notes: I've attached a screenshot of the relevant lines of code in my app. (Sorry, it's impossible to provide you with the whole project.) 14-Nov-2008 09:32 AM Jeff Johnson: I don't know exactly what's causing the problem, so I can't produce a reduced case. The application is very complex, with multiple embedded frameworks. I have discovered, however, that switching from STABS to DWARF makes the problem disappear. If I switch back to STABS, the problem occurs again. It seems that it's 100% reproduce with STABS, 0% reproducible with DWARF.