Jeremy Fitzhardinge wrote:
Christopher S. Aker wrote on 12/26/07 2:33 PM,
Sorry for the noise if this isn't the appropriate venue for this. I
posted this last month to xen-devel:
http://lists.xensource.com/archives/html/xen-devel/2007-11/msg00777.html
I can reliably cause a paravirt_ops Xen guest to hang during intensive
IO. My current recipe is an untar/tar loop, without compression, of a
kernel tree. For example:
wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.23.tar.bz2
bzip2 -d linux-2.6.23.tar.bz2
while true;
date
tar xf linux-2.6.23.tar
tar cf linux-2.6.23.tar linux-2.6.23
done
After a few loops, anything that touches the xvd device that hung will
get stuck in D state.
This happens on both a 2.6.16 and 2.6.18 dom0 (3.1.2 tools). Paravirt
guests I've tried that exhibit the problem: 2.6.23.8, 2.6.23.12, and
2.6.24-rc6. It does *not* occur using the Xensource 2.6.18 domU tree
from 3.1.2. In all cases, the host continues to run fine, nothing out
of the ordinary is logged on the dom0 side, xenstore reports the
status of the devices is fine.
Can anyone reproduce this problem, or let me know what else I can
provide to help track this down?
Hi,
I'll try to track this down asap. Have you tried any other kernel
versions? In other words, did it just start happening, or its always
done it? Also, could you try 2.6.24-rc6, just to make sure it hasn't
already been fixed (which is possible if its something that happened in
a higher layer or something).
Were you able to give this a try? Still doing it on pv_ops 2.6.24.
Thanks,
-Chris
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