Ok, I think the problem arised because of the serial connection to my 
PC. Probably there came a break signal when booting up or shutting down 
the PC.
I compiled the kernel without inline debugger and now it's running fine.

regards,
Christian



Christian Lamare wrote:

> Hi all,
>
> my qube randomly ends up with "db" on console. When typing "c"  I get 
> the message: "tlp0: receive ring overrun" and it gets back to live.
> During the db session no network traffic is accepted.
>
> I am using a customized current kernel NetBSD 1.6ZH.
>
> I also found a core dump of squid, but I am not sure if this is related.
>
> Has anybody else encountered  those problems? Is there any means to 
> get more information when stuck in "db"?
>
> regards,
> Christian
>
>
>