On Fri, Oct 28, 2005 at 09:19:14AM -0700, Badari Pulavarty wrote:
> My touch tests so far, doesn't really verify data after freeing. I was
> thinking about writing cases. If I can use UML to do it, please send it
> to me. I would rather test with real world case :)

Grab and unpack http://www.user-mode-linux.org/~jdike/truncate.tar.bz2

That will give you a "linux" directory.

Make sure that your /tmp is tmpfs with > 192M of space.

Run UML - from above the linux directory, this would be something like
	linux/2.6/linux-2.6.14-rc5/obj/linux con0=fd:0,fd:1 con1=none con=pts ssl=pts umid=debian mem=192M ubda=linux/debian_22 devfs=nomount

Log in, the root password is "root".

Unplug some memory -
	linux/uml_mconsole debian config mem=-10M

Go back to the UML and try do to something - ps, ls, anything.

It will be hung on handling an infinite page fault loop due to a whole lot
of pages having been zeroed all of a sudden.

This will happen even when you unplug 2 pages (mem=-8K).  Only one of them
will be madvised because the other is used to keep track of the madvised
pages.

I also included my patchset in there (linux/2.6/linux-2.6.14-rc5/patches) if
you want to build UML from source.  Due to my not refreshing the hotplug 
patch before making the tarball, it's not there.  So, I've attached it.

				Jeff