Disabling CONFIG_RANDOMIZE_MEMORY did not help. Disabled CONFIG_RANDOMIZE_BASE as well and the symbols came up. The weird thing is that CONFIG_RANDOMIZE_BASE is enabled on Xenial (4.4) kernel as well, but somehow having it enabled on Zesty (4.10) kernel throws off kgdb. Thanks, Kamran. On Fri, Jun 16, 2017 at 3:02 PM, Kamran Khan <krkhan@inspirated.com> wrote:
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@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.