Hi, try this: This will start opening infinite number of debuggers, because of A>>doesNotUnderstand: #halt. Ok, so, if I replace /self halt/ with /Halt signal/, it will do the same, but now because of A>>doesNotUnderstand: #inspector. But in both cases, after successfully (before stack is full) interrupting the recursion with Alt+., only the Process Browser is full of "Morphic UI process:MorphicUIManager>>openDebuggerOn:context:label:contents:fullView:" no real debugger is visible... My question: How to debug code inside DNU method? Bug? Feature? I know, the full stack issue can be solved by a watchdog, is it planned? And it was discussed before here on mailinglist, but with different code examples. Or one can limit the total count of opened... ----- Save The World! -- View this message in context: http://forum.world.st/Debugger-recursion-tp4704703.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.