Random Crash Observed while running program compiled with latest gcc

Random Crash Observed while running program compiled with latest gcc

[praveen ab]

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Hi All,

We are upgrading the GCC version for our existing C/C++ project.
Earlier we were using gcc 5.4 and everything was working fine.(The
application works fine even with gcc 7.4)
When trying to build the application using gcc 8.1 and above we are
observing the random crashes mostly segmentation fault.
Any suggestions on how to debug this?

Right now I am trying the following:
Enabling the -Wall flag and trying to fix all the warnings
Using GDB to inspect memory location and variables.

Please Suggest anything else that needs to be checked?


-- 
*Thanks and Regards,*
*Praveen AB*

Re: Random Crash Observed while running program compiled with latest gcc

[Xi Ruoyao]

On Thu, 2023-02-09 at 16:26 +0530, praveen ab via Gcc-help wrote:
> Hi All,
> 
> We are upgrading the GCC version for our existing C/C++ project.
> Earlier we were using gcc 5.4 and everything was working fine.(The
> application works fine even with gcc 7.4)
> When trying to build the application using gcc 8.1 and above we are
> observing the random crashes mostly segmentation fault.
> Any suggestions on how to debug this?
> 
> Right now I am trying the following:
> Enabling the -Wall flag and trying to fix all the warnings
> Using GDB to inspect memory location and variables.
> 
> Please Suggest anything else that needs to be checked?

Try -fsanitize=undefined and -fsanitize=address.

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University

Re: Random Crash Observed while running program compiled with latest gcc

[Arsen Arsenović]

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Hi,

praveen ab via Gcc-help <gcc-help@gcc.gnu.org> writes:

> Hi All,
>
> We are upgrading the GCC version for our existing C/C++ project.
> Earlier we were using gcc 5.4 and everything was working fine.(The
> application works fine even with gcc 7.4)
> When trying to build the application using gcc 8.1 and above we are
> observing the random crashes mostly segmentation fault.
> Any suggestions on how to debug this?
>
> Right now I am trying the following:
> Enabling the -Wall flag and trying to fix all the warnings
> Using GDB to inspect memory location and variables.
>
> Please Suggest anything else that needs to be checked?

The UB sanitizer might also prove useful to detect UB that does not
necessarily result in crashes.  Pass -fsanitize=undefined to enable it.

I can't provide much more specific instructions, but it's quite likely
that there's a good bit of UB in the code you're building, if it broke
in such a regard on compiler updates.

Is there a reason for using GCC 8 as opposed to newer GCC versions?

Best of luck, have a great day.
-- 
Arsen Arsenović

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Re: Random Crash Observed while running program compiled with latest gcc

[praveen ab]

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Hi Xi Ruoyao and Arsen Arsenović

Thanks for the suggestion to use -fsanitize=undefined flag, with this flag
I am able to identify and fix multiple runtime errors and further able to
find many more as I am proceeding with running different scenarios.

@Arsen Arsenović: I am using GCC 11.3 (I started observing the random crash
issue due to UBs with gcc > 7.4)




On Thu, Feb 9, 2023 at 4:37 PM Arsen Arsenović <arsen@aarsen.me> wrote:

> Hi,
>
> praveen ab via Gcc-help <gcc-help@gcc.gnu.org> writes:
>
> > Hi All,
> >
> > We are upgrading the GCC version for our existing C/C++ project.
> > Earlier we were using gcc 5.4 and everything was working fine.(The
> > application works fine even with gcc 7.4)
> > When trying to build the application using gcc 8.1 and above we are
> > observing the random crashes mostly segmentation fault.
> > Any suggestions on how to debug this?
> >
> > Right now I am trying the following:
> > Enabling the -Wall flag and trying to fix all the warnings
> > Using GDB to inspect memory location and variables.
> >
> > Please Suggest anything else that needs to be checked?
>
> The UB sanitizer might also prove useful to detect UB that does not
> necessarily result in crashes.  Pass -fsanitize=undefined to enable it.
>
> I can't provide much more specific instructions, but it's quite likely
> that there's a good bit of UB in the code you're building, if it broke
> in such a regard on compiler updates.
>
> Is there a reason for using GCC 8 as opposed to newer GCC versions?
>
> Best of luck, have a great day.
> --
> Arsen Arsenović
>


-- 
*Thanks and Regards,*
*Praveen AB*