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

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Tomasz Chmielewski <mangoo@xxxxxxxx>
  • Date: Fri, 09 Feb 2007 11:02:46 +0100
  • Delivery-date: Fri, 09 Feb 2007 02:03:40 -0800
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

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:




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


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

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