On Sat, Sep 29, 2012, at 06:40 AM, Ken Thomases wrote:
> A couple of things I would try:
> 
> 1) Examine the registers for the stack frame of the
> objc_msgSend_vtable5() call to see if you can figure out what message was
> being sent and possibly its arguments. 
> <http://sealiesoftware.com/blog/archive/2008/09/22/objc_explain_So_you_crashed_in_objc_msgSend.html>

Also from Greg's website, it's helpful to know that
objc_msgSend_vtable5() is always -respondsToSelector:.
<http://www.sealiesoftware.com/blog/archive/2011/06/17/objc_explain_objc_msgSend_vtable.html>

The _vtable functions are optimized functions for dispatching specific
selectors.

--Kyle Sluder
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