Cause of the ?? in backtrace

[Daniel Jacobowitz]

On Mon, Mar 12, 2007 at 10:47:54AM -0400, Rich Rattanni wrote:
> Why would one get the following when trying to do a backtrace in GDB...

Because GDB could not figure out what came next.  The library might be
too optimized and stripped, or the stack might be corrupt, or GDB
might have a bug, or some other operating system specific problem.

-- 
Daniel Jacobowitz
CodeSourcery