Re: [Valgrind-users] How can valgrind prevent Segmentation fault?

[John P. <Joh...@us...>]

I had a problem like last May, though it may not have been the same problem. In my case it was the optimization settings. I typically used -O0 for valgrind, and at -O0 the program didn’t crash. At level -O1 or higher it always crashed. I can’t recall if I ran it in valgrind at -O1 or higher, but if I did then that didn’t help me find the problem, either.

In the end I combed through the code where the problem was occurring, and discovered that I had forgotten to return a value from a function that was declared to return bool. I hadn’t noticed the compiler warning in the 20 screens of Makefile messages that scrolled by.

I hope that’s somehow helpful.

john perry

> On Jan 26, 2019, at 5:12 PM, Peng Yu <pen...@gm...> wrote:
> 
> Hi,
> 
> I have an executable. If I just run on its own, there will be
> segmentation fault. But if I run it using valgrind, it finishes
> successfully. Does anybody how can this happen? How to debug such a
> program? Thanks.
> 
> -- 
> Regards,
> Peng
> 
> 
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