The can_roll function fails inappropriately in stale_work.

main.c

@@ -1289,15 +1289,18 @@ static bool workio_get_work(struct workio_cmd *wc)
 	return true;
 }
 
-static bool stale_work(struct work *work)
+static bool stale_work(struct work *work, bool rolling)
 {
-	struct timeval now;
 	bool ret = false;
 	char *hexstr;
 
-	gettimeofday(&now, NULL);
-	if ((now.tv_sec - work->tv_staged.tv_sec) > opt_scantime)
-		return true;
+	if (!rolling) {
+		struct timeval now;
+
+		gettimeofday(&now, NULL);
+		if ((now.tv_sec - work->tv_staged.tv_sec) > opt_scantime)
+			return true;
+	}
 
 	/* Only use the primary pool for determination as the work may
 	 * interleave at times of new blocks */
@@ -1326,7 +1329,7 @@ static void *submit_work_thread(void *userdata)
 
 	pthread_detach(pthread_self());
 
-	if (stale_work(work)) {
+	if (stale_work(work, false)) {
 		applog(LOG_WARNING, "Stale share detected, discarding");
 		total_stale++;
 		pool->stale_shares++;
@@ -1335,7 +1338,7 @@ static void *submit_work_thread(void *userdata)
 
 	/* submit solution to bitcoin via JSON-RPC */
 	while (!submit_upstream_work(work)) {
-		if (stale_work(work)) {
+		if (stale_work(work, false)) {
 			applog(LOG_WARNING, "Stale share detected, discarding");
 			total_stale++;
 			pool->stale_shares++;
@@ -2412,7 +2415,7 @@ static void flush_requests(void)
 
 static inline bool can_roll(struct work *work)
 {
-	return (work->pool && !stale_work(work) && work->pool->has_rolltime &&
+	return (work->pool && !stale_work(work, true) && work->pool->has_rolltime &&
 		work->rolls < 11 && !work->clone);
 }
 
@@ -2520,7 +2523,7 @@ retry:
 		goto retry;
 	}
 
-	if (stale_work(work_heap)) {
+	if (stale_work(work_heap, false)) {
 		dec_queued();
 		discard_work(work_heap);
 		goto retry;
@@ -2826,7 +2829,7 @@ static void *miner_thread(void *userdata)
 			decay_time(&hash_divfloat , (double)((MAXTHREADS / total_hashes) ? : 1));
 			hash_div = hash_divfloat;
 			needs_work = true;
-		} else if (work_restart[thr_id].restart || stale_work(work) ||
+		} else if (work_restart[thr_id].restart || stale_work(work, false) ||
 			work->blk.nonce >= MAXTHREADS - hashes_done)
 				needs_work = true;
 	}
@@ -3051,7 +3054,7 @@ static void *gpuminer_thread(void *userdata)
 		if (diff.tv_sec > opt_scantime ||
 		    work->blk.nonce >= MAXTHREADS - hashes ||
 		    work_restart[thr_id].restart ||
-		    stale_work(work)) {
+		    stale_work(work, false)) {
 			/* Ignore any reads since we're getting new work and queue a clean buffer */
 			status = clEnqueueWriteBuffer(clState->commandQueue, clState->outputBuffer, CL_FALSE, 0,
 					BUFFERSIZE, blank_res, 0, NULL, NULL);