In boot stage , my kernel get into loop restart due to page_fault. I have catched the source . here is the backtrace : #3 0xc01c686e in new_inode (sb=0xc8df5800) at fs/inode.c:551 #4 0xc01d076d in get_sb_pseudo (fs_type=0xc02e1d00, name=0xc02c3747 "futex", ops=0x0, magic=195894762) at fs/libfs.c:201 #5 0xc015cbbf in futexfs_get_sb (fs_type=0xc02e1d00, flags=0, dev_name=0xc02c374d "futexfs", data=0x0) at kernel/futex.c:679 #6 0xc01a62c5 in do_kern_mount (fstype=0xc02c374d "futexfs", flags=0, name=0xc02c374d "futexfs", data=0x0) at fs/super.c:718 code at the frame 3 is : struct inode *root = new_inode(s); after return from the new_inode , the root->i_dentry=(0x1,0x3). then calling the function d_instantiate(entry, root),here entry is of type struct entry*, this calls do list_add(&entry->d_alias, root->i_dentry), Obviously,this need to address the inode->i_dentry->next,which is ox3, but 0x3 is low address ,addressing to it causes a page_fault ,then make system restart . I doubt that the returned root inode need to be initialized using a applicable i_dentry . If so ,what value can be used ? If not , where am I wrong? thanks!