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Re: [Xen-devel] Segfault When Building Snapshot xen-3d14ce7 kernel From

To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Subject: Re: [Xen-devel] Segfault When Building Snapshot xen-3d14ce7 kernel From linux/kernel/git/jeremy/xen.git/shortlog
From: "John McDermott (U.S. Navy Employee)" <john.mcdermott@xxxxxxxxxxxx>
Date: Mon, 28 Mar 2011 08:41:30 -0400
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Sorry for the delay. The development box in question has older hardware, so it 
takes a long time to compile a kernel to investigate various possibilities.

We were running an earlier version of the pvops kernel, on Xen 4.0.1. 
Apparently the fault is caused by the -j switch in make, but not always. I can 
compile the newer kernel single-threaded without any problems (other than I 
have to run it overnight), without ever reproducing the problem, so it cannot 
be in kernel source or the tools per se. We have been running (and building 
Xen) on the newer snapshot xen-3d14ce7 kernel with no problems.

Debugging this problem uncovered a different issue with the IBM sHype security 
features (ACM), so we are focused on that for now.

I will start logging more, whenever I build a new pvops kernel, to see if I can 
collect anything useful. We will also have a look at adding a kernel build to 
our development stress tests.



On Mar 18, 2011, at 9:28 AM, Ian Campbell wrote:

> Are you running the host under Xen when this happens? Which
> kernel/hypervisor? Is there anything in your kernel logs?

What is the formal meaning of the one-line program
#include "/dev/tty"

J.P. McDermott                  building 12
Code 5542                       mcdermott@xxxxxxxxxxxxxxxx
Naval Research Laboratory       voice: +1 202.404.8301
Washington, DC 20375, US        fax:   +1 202.404.7942

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