Reposting the patch publicly. 

Excerpt from ChangeLog-2.6.14-rc1:

When copying data from user-space to kernel-space by __copy_user(),
a page_not_present fault sometimes occurs at vmalloced kernel address
because of VHPT pre-fetching.

Ignore the page_not_present fault in ia64_do_page_fault() before
jumping into exception handlers.

diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c

file:a949a83e0dccbb34531dea37145fee9ab3ea6895 ->
file:ee85e28e2ec5f05486b25265ce2a9568590ea7af
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -206,9 +206,6 @@ ia64_do_page_fault (unsigned long addres
               return;
       }

-       if (done_with_exception(regs))
-               return;
-
       /*
        * Since we have no vma's for region 5, we might get here even if the
address is
        * valid, due to the VHPT walker inserting a non present translation that
becomes
@@ -219,6 +216,9 @@ ia64_do_page_fault (unsigned long addres
       if (REGION_NUMBER(address) == 5 && mapped_kernel_page_is_present(address))
               return;

+       if (done_with_exception(regs))
+               return;
+
       /*
        * Oops. The kernel tried to access some bad page. We'll have to
terminate things
        * with extreme prejudice.

In answer to comment #10, the fix is queued for the next U7 build, which
will probably occur tomorrow night.

A fix for this problem has just been committed to the RHEL3 U7
patch pool this evening (in kernel version 2.4.21-37.12.EL).

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2006-0144.html