On 24.01.2012 11:16, Martin Steigerwald wrote:

Am Dienstag, 24. Januar 2012 schrieb Arne Jansen:

quoted

On 21.01.2012 11:49, Martin Steigerwald wrote:

quoted

Am Dienstag, 20. Dezember 2011 schrieb Martin Steigerwald:

When I do btrfs scrub start / the machine locks immediately up hard.

Can you please give me the output of sysrq-w when the machine is locked
up?

What would be the easiest way to do that?

The machine is locked up, means, no mouse, no keyboard, no ping - as far 
as I remember I tested a ping, but I can verify -, no nothing.

Hm, I always use a (hardware) serial console, but I think on default loglevel
the sysrq-output goes to dmesg only, so you have to adjust the loglevel also.
Normally I have a ssh into the box running with a tail -f /var/log/messages.
This locks up very seldom.
Have you tried some sysrq combinations? It might work, even when the
keyboard looks locked up in all other respects.

Serial console with USB serial adapter?

Thanks,