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copied!<blockquote> <p>I know that: Exception Type: EXC_BAD_ACCESS (SIGSEGV) mean we are accessing a released object.</p> </blockquote> <p><strong>No.</strong></p> <p>A SIGSEGV is a segmentation fault, meaning you are trying to access an invalid memory address.</p> <p>Those exceptions (in fact, they are signals) are not related to Objective-C, but C. So you can get such an exception without Objective-C objects.</p> <p>Note that a signal is not an exception, meaning you can't catch them with <code>@try</code> and <code>@catch</code> blocks.</p> <p>You may set a signal handler with the <code>signal</code> and <code>sigaction</code> functions. Keep in mind some signals, like SIGABRT cannot be blocked.</p> <p>You can check the <a href="http://en.wikipedia.org/wiki/Signal.h" rel="noreferrer">Wikipedia</a> page about signals, if you want more informations.</p> <p>That said, to resume:</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGSEGV" rel="noreferrer">SIGSEGV</a></strong> (Segmentation fault)</h2> <p>Access to an invalid memory address. The address exist, but your program does not have access to it.</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGBUS" rel="noreferrer">SIGBUS</a></strong> (Bus error)</h2> <p>Access to an invalid memory address. The address does not exist, or the alignment is invalid.</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGFPE" rel="noreferrer">SIGFPE</a></strong> (Floating point exception)</h2> <p>Invalid arithmetic operation. Can be related to integer operations, despite the name.</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGPIPE" rel="noreferrer">SIGPIPE</a></strong></h2> <p>Broken pipe.</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGILL" rel="noreferrer">SIGILL</a></strong></h2> <p>Illegal processor instruction.</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGTRAP" rel="noreferrer">SIGTRAP</a></strong></h2> <p>Debugger related</p> <h2><strong><a href="http://en.wikipedia.org/wiki/SIGABRT" rel="noreferrer">SIGABRT</a></strong></h2> <p>Program crash, not related to one of the preceding signal.</p>

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