expand_stack is only protected with down_read(&mmap_sem), and thus 2
thread could grow a vma at the same time.
I think the spin_lock(&page_table_lock) should be moved up before the
calculation of grow.
And map_user_kiobuf() doesn't honor VM_LOCKED for VM_GROWSDOWN segments.
Probably it should be switched to find_extend_vma instead of the
do-it-yourself implementation.
--
Manfred
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