¿Qué es Exc_bad_instruction?

What is Exc_bad_instruction?

In the context of Swift code, EXC_BAD_INSTRUCTION usually means you’ve hit a compiler trap, that is, an undefined instruction inserted into the code by the compiler because of a bug detected at runtime. The most common cause of these are: failure to unwrap an optional — This can be a forced unwrap ( !

The SIGTSTP signal is an interactive stop signal. Unlike SIGSTOP , this signal can be handled and ignored. … When any process in a background job tries to read from the terminal, all of the processes in the job are sent a SIGTTIN signal. The default action for this signal is to stop the process.

In the screenshot you see a few things: On the left you see a list of threads that ran when the app crashed. You see that the thread that caused the crash is the main thread, or “Thread 1”. In the editor we see that dreaded Thread 1: signal SIGABRT error. It has highlighted line 12 in the editor, the class definition of AppDelegate.

What Does “Thread 1: Signal SIGABRT” Mean? The error SIGABRT stands for “signal abort”. It’s a signal that’s sent by iOS – the operating system – to a running app, which will immediately quit the app because of a runtime error. It essentially means your app has crashed…

In many cases Xcode won’t show you any helpful error messages for a SIGABRT crash. When that happens, it’s useful to know a few debugging commands, such as bt. Xcode has an integrated debugging environment called LLDB. It’s what you see at the bottom of Xcode when your app runs, the Console or debug output area.

It essentially means your app has crashed… Here’s what it looks like in Xcode: In the screenshot you see a few things: On the left you see a list of threads that ran when the app crashed. You see that the thread that caused the crash is the main thread, or “Thread 1”.