Hang while "Switching to gdb back-end"

[Navdeep Parhar]

On Thu, Jul 02, 2020 at 05:57:58PM +0530, Arka Sharma wrote:
> Dear All,
> 
> I have installed FreeBSD 12.1. I have set the "hint.uart.0.flags="0x90" in
> the /boot/device.hints file. I also have both ddb and gdb listed when I
> issue "sysctl   debug.kdb.available".  So when I launch db using "sysctl
> debug.kdb.enter=1" and issue gdb to change the mode to gdb it shows
> "Switching to gdb back-end" and doesn't respond to Ctrl+c. I have to reset
> the system in order to get the system up.

All this is expected behavior.  You have to connect to the gdb backend
over the serial port using kgdb running on a different system after you
see the "Switching to gdb ..." message.  Then debug as usual and detach
when done.

Regards,
Navdeep