Fix memory leaks on Netdata exit (#12511)

* Fix memory leaks in dimensions and charts

* Initialize superblock memory regions

* Clean up static threads

* Fix memory leaks in compression

* Fix memory leaks in rrdcaltemplate

* Fix memory leaks in health config

* Fix ACLK memory leaks

5 files changed, 14 insertions, 0 deletions

diff --git a/database/engine/datafile.c b/database/engine/datafile.c
index d423110790..46d7a8f101 100644
--- a/database/engine/datafile.c
+++ b/database/engine/datafile.c
@@ -159,6 +159,7 @@ int create_data_file(struct rrdengine_datafile *datafile)
     if (unlikely(ret)) {
         fatal("posix_memalign:%s", strerror(ret));
     }
+    memset(superblock, 0, sizeof(*superblock));
     (void) strncpy(superblock->magic_number, RRDENG_DF_MAGIC, RRDENG_MAGIC_SZ);
     (void) strncpy(superblock->version, RRDENG_DF_VER, RRDENG_VER_SZ);
     superblock->tier = 1;
diff --git a/database/engine/journalfile.c b/database/engine/journalfile.c
index ad5f7befc7..1541eb10aa 100644
--- a/database/engine/journalfile.c
+++ b/database/engine/journalfile.c
@@ -210,6 +210,7 @@ int create_journal_file(struct rrdengine_journalfile *journalfile, struct rrdeng
     if (unlikely(ret)) {
         fatal("posix_memalign:%s", strerror(ret));
     }
+    memset(superblock, 0, sizeof(*superblock));
     (void) strncpy(superblock->magic_number, RRDENG_JF_MAGIC, RRDENG_MAGIC_SZ);
     (void) strncpy(superblock->version, RRDENG_JF_VER, RRDENG_VER_SZ);
 
diff --git a/database/rrdcalctemplate.c b/database/rrdcalctemplate.c
index 67288e9dbb..9789f4beab 100644
--- a/database/rrdcalctemplate.c
+++ b/database/rrdcalctemplate.c
@@ -120,6 +120,9 @@ inline void rrdcalctemplate_free(RRDCALCTEMPLATE *rt) {
     freez(rt->name);
     freez(rt->exec);
     freez(rt->recipient);
+    freez(rt->classification);
+    freez(rt->component);
+    freez(rt->type);
     freez(rt->context);
     freez(rt->source);
     freez(rt->units);
diff --git a/database/rrddim.c b/database/rrddim.c
index f0514180df..df45363bc7 100644
--- a/database/rrddim.c
+++ b/database/rrddim.c
@@ -495,6 +495,7 @@ void rrddim_free_custom(RRDSET *st, RRDDIM *rd, int db_rotated)
         case RRD_MEMORY_MODE_RAM:
             debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
             freez((void *)rd->id);
+            freez((void *)rd->name);
             freez(rd->cache_filename);
             freez(rd->state);
             munmap(rd, rd->memsize);
@@ -505,6 +506,7 @@ void rrddim_free_custom(RRDSET *st, RRDDIM *rd, int db_rotated)
         case RRD_MEMORY_MODE_DBENGINE:
             debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
             freez((void *)rd->id);
+            freez((void *)rd->name);
             freez(rd->cache_filename);
             freez(rd->state);
             freez(rd);
diff --git a/database/rrdset.c b/database/rrdset.c
index 7b58d3780d..7a1ce74e1d 100644
--- a/database/rrdset.c
+++ b/database/rrdset.c
@@ -395,6 +395,13 @@ void rrdset_free(RRDSET *st) {
     netdata_rwlock_destroy(&st->state->labels.labels_rwlock);
 
     // free directly allocated members
+    freez((void *)st->name);
+    freez(st->type);
+    freez(st->family);
+    freez(st->title);
+    freez(st->units);
+    freez(st->context);
+    freez(st->cache_dir);
     freez(st->config_section);
     freez(st->plugin_name);
     freez(st->module_name);