backtrace shows ?? instead of function names in gdb

[Saurabh Thukral]

>
> That looks like an indirect call through a NULL function pointer.  Never
> a valid function, thus it never has a name.
>
> Andreas.
>
> --
> Andreas Schwab, SuSE Labs, schwab@suse.de
> SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
> PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
> "And now for something completely different."
>

Hi Andreas,

Thanks for the prompt response.
I will investigate this matter by doing code review.

Whether this is the only reason that such a peculiar backtrace is
produced ? If you refer to the link given in my original post, the
answer posted states several reasons.

Saurabh