Ollydbg - automatically add hardware breakpoint when step over

Question

I put INT3 breakpoint and starting the program. The OllyDbg break at the breakpoint, but when I step over, the OllyDbg put a hardware breakpoint. (Yesterday not happened in OllyDbg, but today during training it happened.)
ٍEdit : A red square usually occurs when step over, but goes to the next line immediately. But in this call, when i click F8 to step over, the program has stopped and no longer works.

blabb · Answer

That is The Default Behavior for almost every Debugger.
you might not have noticed it when the Function Returned Quickly
you should always see a red flicker on every F8 (StepOver)  on a call
it is an internal breakpoint set by ollydbg /any debugger and handled by ollydbg / almost all debugger
how would a debugger know to stop where after executing unknown instructions inside a call
see a gif for the flicker when doing f8 which executes the return silently
and no red flicker if you step in with f7

if the program stopped working it might have an anti-debugging trick inside the call try stepping in instead of step over  of follow the call set a breakpoint deep inside the function and check

Ollydbg - automatically add hardware breakpoint when step over

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