yamt@mwd.biglobe.ne.jp (YAMAMOTO Takashi) writes:
> 
> UVM_OBJ_NEEDS_WRITEFAULT is for it.
> ah, ubc_fault seems missing the check.  it's a bug.
> the attached patch should fix it. (not tested)

This patch does address the problem I was seeing, and appears
to be working ok.  I will let you know if I see anything
else unusual.

Thank you,
Darrin