GDB does not respond to CTRL+Z and CTRL+C

[Christoph Bartoschek]

Hi,

when I attach to a process and continue it I cannot stop it again by pressing 
CTRL+Z or CTRL+C. Gdb does not respond to these signals.

To be able to stop intercept debugging I have to switch to another console:

kill -STOP <pid of gdb>

and then put it back into foreground.

After this sequence gdb responds to CTRL+Z and CTRL+C. What could be wrong?

Christoph