Re: Can't debug x86_64 C++ programs.

[John Fine <johnsfine@verizon.net>]

Keith Seitz wrote:
>> If I try to view the registers window anytime after pressing Run, the 
>> whole debugger crashes.  If I view the register window first, it 
>> appears, then when I press run it populates, then a moment later the 
>> whole debugger crashes.
>
> Once again, I am sorry, but I cannot reproduce this (on x86).
>
Can you give me an expert opinion on these lines of code in gdbtk-register.c

  regformat = (int *)xcalloc (numregs, sizeof(int));
  regtype = (struct type **)xcalloc (numregs, sizeof(struct type **));

especially that sizeof(int)

I know that whatever object lies directly in physical ram before the 
allocation of regtype has overflowed and corrupted regtype.

I think the above allocations happen early enough in initialization that 
they would sequentially grab new memory (rather than reuse chunks that 
would tend to be distant from each other).

So (barely more than guess) I think regformat is the object using more 
memory than was allocated for it and overflowing into regtype.