VM_BUG_ON_MM      673 kernel/fork.c  	VM_BUG_ON_MM(mm->pmd_huge_pte, mm);
VM_BUG_ON_MM     1214 mm/gup.c       	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
VM_BUG_ON_MM      441 mm/khugepaged.c 	VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
VM_BUG_ON_MM      424 mm/mmap.c      	VM_BUG_ON_MM(bug, mm);