On Tue, 31 Oct 2017, Waiman Long wrote:

>+void dlock_lists_del(struct dlock_list_node *node)
>+{
>+	struct dlock_list_head *head;
>+	bool retry;
>+
>+	do {
>+		head = READ_ONCE(node->head);

Boqun had previously pointed this out; you need to WRITE_ONCE() node->head too.

Thanks,
Davidlohr