Remove client from list of unblocked clients when it is free'd

src/networking.c

@@ -456,6 +456,13 @@ void freeClient(redisClient *c) {
     ln = listSearchKey(server.clients,c);
     redisAssert(ln != NULL);
     listDelNode(server.clients,ln);
+    /* When client was just unblocked because of a blocking operation,
+     * remove it from the list with unblocked clients. */
+    if (c->flags & REDIS_UNBLOCKED) {
+        ln = listSearchKey(server.unblocked_clients,c);
+        redisAssert(ln != NULL);
+        listDelNode(server.unblocked_clients,ln);
+    }
     /* Remove from the list of clients waiting for swapped keys, or ready
      * to be restarted, but not yet woken up again. */
     if (c->flags & REDIS_IO_WAIT) {

src/redis.c

@@ -688,6 +688,7 @@ void beforeSleep(struct aeEventLoop *eventLoop) {
         redisAssert(ln != NULL);
         c = ln->value;
         listDelNode(server.unblocked_clients,ln);
+        c->flags &= ~REDIS_UNBLOCKED;
 
         /* Process remaining data in the input buffer. */
         if (c->querybuf && sdslen(c->querybuf) > 0)

src/redis.h

@@ -136,6 +136,8 @@
 #define REDIS_IO_WAIT 32    /* The client is waiting for Virtual Memory I/O */
 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 #define REDIS_CLOSE_AFTER_REPLY 128 /* Close after writing entire reply. */
+#define REDIS_UNBLOCKED 256 /* This client was unblocked and is stored in
+                               server.unblocked_clients */
 
 /* Client request types */
 #define REDIS_REQ_INLINE 1

src/t_list.c

@@ -773,7 +773,8 @@ void unblockClientWaitingData(redisClient *c) {
     zfree(c->bpop.keys);
     c->bpop.keys = NULL;
     c->bpop.target = NULL;
-    c->flags &= (~REDIS_BLOCKED);
+    c->flags &= ~REDIS_BLOCKED;
+    c->flags |= REDIS_UNBLOCKED;
     server.bpop_blocked_clients--;
     listAddNodeTail(server.unblocked_clients,c);
 }