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    <p>SIGSEGV literally means you're accessing an address you don't own. So it's not necessarily that you're accessing a released object; you could be accessing an object that never existed, as in:</p> <pre><code>UIView *view; // uninitialised, could point to anything [view setFrame:someFrame]; </code></pre> <p>Or even just making an error in C-level non-object stuff, such as:</p> <pre><code>int array[100]; array[1000] = 23; // out-of-bounds access </code></pre> <p>SIGBUS is very similar to SIGSEGV, the difference being at the hardware level (usually the difference between trying to access an address that does exist but which you don't own and trying to access an address that doesn't have anything behind it, but that's not a strict definition), but is usually associated with the same sort of errors, though a SIGBUS is much more likely to be to do with an uninitialised variable than a SIGSEGV.</p> <p>If you're trying to map to errors you probably made in Objective-C, you probably just want to read SIGSEGV and SIGBUS together as meaning "a memory access I didn't have the right to make".</p> <p>SIGABRT is a program attempting to abort itself, so it usually means that some sort of internal consistency check has failed. For example, SIGABRT is raised if you try to free the same memory twice, or — at the Cocoa level — if you <code>raise</code> an <code>NSException</code> that isn't caught. If you get a SIGABRT, you've done something wrong that is detected by the system software (in contrast to SEGV and BUS, which arise in hardware).</p> <p>SIGTRAP is a call out from the program to a debugger. Anecdotally, Apple seem to use these when you do something wrong that can be detected in software but relates to the environment rather than your specific code. So, for example, you call a C function that exists in the SDK you built with but not on the device you are running on (such as when you build against the latest SDK with a lower deployment target), or do a similar thing with an object.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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