Virtualbox + kgdb: Can't see vmlinux symbols

[Kamran Khan]

The debug symbols are on for all of them, and gdb *does* load the
symbols. I have a suspicion that KASLR that was introduced around 4.7
might be the culprit here. CONFIG_RANDOMIZE_MEMORY is an option that's
not present in the Xenial config.

Anyone here has attached kgdb to 4.8/4.10?

Thanks,
Kamran.

On Fri, Jun 16, 2017 at 1:41 PM,  <valdis.kletnieks at vt.edu> wrote:
> On Fri, 16 Jun 2017 13:24:58 -0700, Kamran Khan said:
>> This is happening only with kernel 4.8+.
>>
>> When I compile kernel 4.4 with a stock Ubuntu Xenial .config, symbols
>> appear just fine.
>>
>> When I compile kernel 4.8/4.10 with Yakkety/Zesty stock configs the
>> symbols disappear.
>
> What happens when you try to compile 4.8/r.10 with a Xenial .config?
>
> I'm willing to bet the problem is that the Xenial config turns on symbols
> and Yakkety/Zesty disable them by default.
>
> See these for further info:
>
> CONFIG_DEBUG_INFO=y
> CONFIG_DEBUG_INFO_REDUCED=y
> CONFIG_DEBUG_INFO_SPLIT=y
>
> It appears that you'll need DEBUG_INFO_REDUCED=n for kgdb to work properly.