flashboot - Jun 2009 - Kernel panic when printing on serial console

Hello,

I have a Soekris Net-4501 running flasboot/OpenBSD-4.5

uname -a
OpenBSD fremen 4.5 SOEKRIS4501#0 i386

when I connect a NULL-modem cable to an USB serial port, I often
experience kernel panics.
They can be "solved" by typing ''c'' on the KDB
console. But I must be
physically present. Sometimes it hangs when I''m remote, if the cable is
plugged -- especially when the attached computer is shut down.

Have you experienced these kind of problem ? Is there a trick to not
suffer them ?

Regards,

-- 
Bastien Durel

Hi Bastien,

   Please edit the /etc/sysctl.conf on your machine and  
add/adjust/uncomment the following line..

ddb.console=0                   # 1=Permit entry of ddb from the console

   By default, you could escape to the ddb/KDB from the console.  
Activity on the serial port like a reboot on the other side of the  
serial cable can trigger that escape.

   I allways disable ddb.console now. Bitten too often in the past.

Cheers

Y.


Quoting Bastien Durel <bastien.durel at geekwu.org>:
> Hello,
>
> I have a Soekris Net-4501 running flasboot/OpenBSD-4.5
>
> uname -a
> OpenBSD fremen 4.5 SOEKRIS4501#0 i386
>
> when I connect a NULL-modem cable to an USB serial port, I often
> experience kernel panics.
> They can be "solved" by typing ''c'' on the KDB
console. But I must be
> physically present. Sometimes it hangs when I''m remote, if the
cable is
> plugged -- especially when the attached computer is shut down.
>
> Have you experienced these kind of problem ? Is there a trick to not
> suffer them ?
>
> Regards,
>
> --
> Bastien Durel
> _______________________________________________
> flashboot mailing list
> flashboot at mindrot.org
> https://lists.mindrot.org/mailman/listinfo/flashboot
>