[Xen-users] Xen dom0 kernel freezes - how to debug it?

[Tomasz Chmielewski <mangoo@xxxxxxxx>]

I wanted to use Xen 3.0.4 on a diskless server (started via PXE/tftp).

I use open-iscsi (2.0-754) to access the root filesystem etc.

Unfortunately, it doesn't work very well - dom0 freezes after some time, 
even if I don't start xend.
It's very easy to freeze the machine with a simple script that uses "dd" 
command:
#!/bin/bash

FILE=/file.test

i=1

while true
do
echo "Run: $i"
dd if=/dev/zero of=$FILE bs=1k count=400000
free

i=$((i+1))
done


Usually, the machine will freeze after 5-7 runs.

The freeze doesn't happen if I replace the kernel with a regular one 
(with no Xen patches).

"Freeze" characteristics:

- happens only with Xen kernel; no domUs are running; even xend was not 
started
- I can't switch between consoles (ctrl+alt+F1 etc.) anymore

- I can ping the machine, and can establish a connection to ports that 
were already opened (like SSH/22) i.e. with telnet (the ports are open, 
and I can connect to them, but they do not respond)
- I can use magic SysRQ keys to reboot the machine


Is there a way to debug it?


--
Tomasz Chmielewski
http://wpkg.org

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