Re: Does gdb initialize uninitialized variables?

Ruslan Kabatsayev via Gdb
2022-02-21T17:34:31Z

Hi,

On Mon, 21 Feb 2022 at 12:45, Edgar Mobile via Gdb <gdb@sourceware.org> wrote:
>
> Greetings,
>
> I currently try to find a bug that might be caused by uninitialized variables/memory. But it never appears when I use gdb. Does gdb change how memory is initialized in any way, be it on stack or via new/malloc?

Memory-related bugs that don't happen when using GDB but do without
GDB are often caused by GDB disabling ASLR. This is usually useful for
reproducibility of debugging sessions, but may indeed make address
space layout too predictable and fail to reproduce a bug. Try using
the GDB command "set disable-randomization off" (without quotes) to
undo this behavior and thus start your program in a normal,
randomized, environment.

Besides, if your problem is indeed with uninitialized variables, you
might find Valgrind memory checker more useful than a debugger.

>
> Regards

Regards,
Ruslan