silly debugging question

[Nathan Moore]

Of late I've run into a malloc error in a c++ program using the gmp 
library.  Specifically, the program gives error,

*** malloc[1043]: error for object 0xbffdee80: Pointer being 
reallocated was not allocated
GNU MP: Cannot reallocate memory (old_size=4294425088 new_size=4)

or when run again

*** malloc[1047]: error for object 0x2: Pointer being reallocated was 
not allocated
GNU MP: Cannot reallocate memory (old_size=4294425088 new_size=8)

Is the system simply running out of memory?  In each (and almost every) 
case the program "Abort"s immediately afterward.  The code as presently 
written manipulates rational numbers, (mpq_t) a number of times.

I was trying to use gdb to find the line where the program failed 
earlier this evening, but the syntax seems more cryptic that dbx.  
Realize its unrelated, but would none-the-less appreciate (if its easy 
to explain) a description of the easiest way to give the line at which 
the code fails from the gnu debugger, gdb.


regards,

Nathan Moore