I am suspecting (very usual for changes to MM codes) that u have done something illegal while holding a open spinlock. So knowing where u insert codes, will help us to understand if this is a problem or not.
On Sat, Feb 14, 2009 at 7:52 PM, Sukanto Ghosh <sukanto.cse.iitb@xxxxxxxxx> wrote:
Hi,
I have made some changes to the memory management part of the kernel
as an experiment. Now when I boot into that kernel and start some
heavy processes (which cause paging), the kernel hangs. I can't even
type anything.
I have gone through the 'paper on debugging kernel oops or hang'
(http://mail.nl.linux.org/kernelnewbies/2003-08/msg00347.html)
In this paper Erik says that to get the stack trace we can type
'Alt-SysRq-t' which prints the stack trace and when it's not possible
to type anything, then it's best to use serial port + console. he says
the config for lilo would be: console=ttyS0,9600 console=tty0
As I have grub I am using the following lines:
default=0
timeout=15
title Fedora (2.6.27.4)
root (hd0,0)
kernel /boot/vmlinuz-2.6.27.4 ro root=/dev/sda1
initrd /boot/initrd-2.6.27.4.img
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal --dumb --timeout=10 serial console
CONFIG_MAGIC_SYSRQ was enabled in my config file.
My test kernel is running inside a Virtual machine (VM) (VMware), with
its serial port 0 redirected to a file.
VM OS: fedora Core 9 with modified kernel 2.6.27.4
Host OS: ubuntu hardy 2.6.24.3
My problem is I am not getting any kind of output in the file to which
I redirected the serial port of the VM except a bunch of "Press any
key to continue .. " messages.
should I be providing the 'alt-sysrq-t' input through the serial port,
if so, how ?
can i connect a host terminal to the serial port of the VM.
Vmware gives me three options about the serial port of the Virtual Machine
i) connect it to physical port of the host, ii) connect to a named
pipe and, iii)connect it to a file in the host.
Please help ...
--
Regards,
Sukanto Ghosh
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Regards,
Peter Teoh
