> > Well looking a little more closely than I did last night it looks like
> > access_process_vm (called from ptrace) can cause what amounts to a
> > page fault at pretty arbitrary times.
>
> It's also used for several /proc/<pid> files.
>
> I remember that I got crashes with concurrent exec+cat
> /proc/<pid>/cmdline until down(mmap_sem) was added into
> setup_arg_pages().
O.k. Then the race I'm catching is real though because it is confined
to bss sections, we are quite unlikely to trigger it.
Eric
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