Xen devel - May 2006 - HELP! Grant table issue: WARNING: leaking g.e. and page still in use!

My code often runs into this warning message: WARNING: leaking g.e. and page
still in use!

I found that the gnttab.c generate this error message. But I don''t know
how
to get rid of this issue.
Here is what I did in my code:

1. frontend: allocate pages, grant sharing permission to backend,
2. backend remap this page and use it
3. after backend use the shared page, it call
"HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap,
invcount);" to
end mapping
4. then backend notify the frontend via evtchn
5. upon receiving the signal, the frontend calls
"gnttab_end_foreign_access(ref, 0, 0UL);" to stop sharing. I think
this is
where I got this warning.

Anyone know how to fix this problem? Thanks in advance!

-lily


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