App crashes are a significant issue for both developers and users, leading to potential app uninstalls and financial losses, with a study by DCI revealing that 62% of users uninstall an app after experiencing a crash. The most common iOS crashes include SIGSEGV, SIGBUS, EXC_CRASH (SIGABRT), EXC_CRASH (SIGKILL) identified by the code 0x8badf00d, and NSInvalidArgumentException, each with distinct causes and debugging solutions. SIGSEGV and SIGBUS involve memory access violations, with SIGSEGV related to invalid logical memory addresses and SIGBUS to invalid physical addresses. Debugging SIGSEGV involves identifying deallocated variables being accessed, while SIGBUS errors often arise in synchronous methods accessing invalid locks. EXC_CRASH (SIGABRT) typically arises from unhandled exceptions or abort() calls and can be resolved by analyzing a symbolicated stack trace. The SIGKILL, marked by 0x8badf00d, results from timeouts during app launching or background task handling, with debugging focusing on stack traces and network logs to identify lengthy network requests. NSInvalidArgumentException occurs when methods called are not recognized by the object, and resolving it requires ensuring that the code does not reference unrecognized methods, often aided by stack trace analysis.