On Tue, 2007-04-24 at 15:35 -0500, Bruce Dubbs wrote:

> > >
> > > Have you actually seen the test fail (i.e. mincore pass unexpectedly) in
> > > this way?
> 
> Yes, but it doesn't always fail.  However, I have had it fail and I got
> others to confirm it.
> 
> See the thread at starting at:
> 
> http://linuxfromscratch.org/pipermail/lfs-dev/2007-March/059128.html
> 
> As I dug through the kernel source to see what was happening, there is
> no tie between memory being in core and a specific process instance that
> I could see.  The 'unexpected pass' seemed to be specific to IA32 builds.
> 

Interesting.... I am testing on ia64 so that does explain why I had not
seen that particular failure.  I am thinking this honestly sounds like a
kernel bug, not a test bug.  The test unmaps the page then calls
mincore, it doesn't allocate any memory in between.  It sounds like the
munmap is not working in some cases.

I may have to get my hands on a 32bit x86 system and see this for myself
and try to understand what is happening.

- Doug



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