Merge branch 'maint-20' into maint

* maint-20:
  Updated OTP version
  Update release notes
  Update version numbers
  inets: Prepare for release
  inets: Add missing guard
  Avoid WindowBits=8 as per the manual
  Fix deflateParams on zlib 1.2.11
  Ignore empty binaries in enif_inspect_iovec
  Emasculate writable binaries on entering an iovec
  Only apply EOS behaviors if there's pending data
  Stop assuming that all schedulers are managed when updating msacc

3 files changed, 60 insertions, 41 deletions

diff --git a/erts/emulator/beam/erl_msacc.h b/erts/emulator/beam/erl_msacc.h
index d64ef8c8b9..3f6273f214 100644
--- a/erts/emulator/beam/erl_msacc.h
+++ b/erts/emulator/beam/erl_msacc.h
@@ -279,18 +279,32 @@ void erts_msacc_init_thread(char *type, int id, int liberty);
 #define ERTS_MSACC_PUSH_STATE_M()                         \
     ERTS_MSACC_DECLARE_CACHE();                           \
     ERTS_MSACC_PUSH_STATE_CACHED_M()
-#define ERTS_MSACC_PUSH_STATE_CACHED_M()                                \
-    __erts_msacc_state = ERTS_MSACC_IS_ENABLED_CACHED() ?    \
-        erts_msacc_get_state_m__(__erts_msacc_cache) : ERTS_MSACC_STATE_OTHER
+#define ERTS_MSACC_PUSH_STATE_CACHED_M() \
+    do { \
+        if (ERTS_MSACC_IS_ENABLED_CACHED()) { \
+            ASSERT(!__erts_msacc_cache->unmanaged); \
+            __erts_msacc_state = erts_msacc_get_state_m__(__erts_msacc_cache); \
+        } else { \
+            __erts_msacc_state = ERTS_MSACC_STATE_OTHER; \
+        } \
+    } while(0)
 #define ERTS_MSACC_SET_STATE_M(state)                   \
     ERTS_MSACC_DECLARE_CACHE();                         \
     ERTS_MSACC_SET_STATE_CACHED_M(state)
-#define ERTS_MSACC_SET_STATE_CACHED_M(state)            \
-    if (ERTS_MSACC_IS_ENABLED_CACHED())      \
-        erts_msacc_set_state_m__(__erts_msacc_cache, state, 1)
-#define ERTS_MSACC_POP_STATE_M()                                  \
-    if (ERTS_MSACC_IS_ENABLED_CACHED())                      \
-        erts_msacc_set_state_m__(__erts_msacc_cache, __erts_msacc_state, 0)
+#define ERTS_MSACC_SET_STATE_CACHED_M(state) \
+    do { \
+        if (ERTS_MSACC_IS_ENABLED_CACHED()) { \
+            ASSERT(!__erts_msacc_cache->unmanaged); \
+            erts_msacc_set_state_m__(__erts_msacc_cache, state, 1); \
+        } \
+    } while(0)
+#define ERTS_MSACC_POP_STATE_M() \
+    do { \
+        if (ERTS_MSACC_IS_ENABLED_CACHED()) { \
+            ASSERT(!__erts_msacc_cache->unmanaged); \
+            erts_msacc_set_state_m__(__erts_msacc_cache, __erts_msacc_state, 0); \
+        } \
+    } while(0)
 #define ERTS_MSACC_PUSH_AND_SET_STATE_M(state)                    \
     ERTS_MSACC_PUSH_STATE_M(); ERTS_MSACC_SET_STATE_CACHED_M(state)
 
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index ac4ecd77e5..3ade17b10d 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -3426,36 +3426,38 @@ static int examine_iovec_term(Eterm list, UWord max_length, iovec_slice_t *resul
         size = binary_size(binary);
         binary_header = binary_val(binary);
 
-        /* If we're a sub-binary we'll need to check our underlying binary to
-         * determine whether we're on-heap or not. */
-        if(thing_subtag(*binary_header) == SUB_BINARY_SUBTAG) {
-            ErlSubBin *sb = (ErlSubBin*)binary_header;
-
-            /* Reject bitstrings */
-            if((sb->bitoffs + sb->bitsize) > 0) {
-                return 0;
+        if (size > 0) {
+            /* If we're a sub-binary we'll need to check our underlying binary
+             * to determine whether we're on-heap or not. */
+            if (thing_subtag(*binary_header) == SUB_BINARY_SUBTAG) {
+                ErlSubBin *sb = (ErlSubBin*)binary_header;
+
+                /* Reject bitstrings */
+                if((sb->bitoffs + sb->bitsize) > 0) {
+                    return 0;
+                }
+
+                ASSERT(size <= binary_size(sb->orig));
+                binary_header = binary_val(sb->orig);
             }
 
-            ASSERT(size <= binary_size(sb->orig));
-            binary_header = binary_val(sb->orig);
-        }
-
-        if(thing_subtag(*binary_header) == HEAP_BINARY_SUBTAG) {
-            ASSERT(size <= ERL_ONHEAP_BIN_LIMIT);
+            if (thing_subtag(*binary_header) == HEAP_BINARY_SUBTAG) {
+                ASSERT(size <= ERL_ONHEAP_BIN_LIMIT);
 
-            result->iovec_len += 1;
-            result->onheap_size += size;
-        } else {
-            ASSERT(thing_subtag(*binary_header) == REFC_BINARY_SUBTAG);
+                result->iovec_len += 1;
+                result->onheap_size += size;
+            } else {
+                ASSERT(thing_subtag(*binary_header) == REFC_BINARY_SUBTAG);
 
-            result->iovec_len += 1 + size / MAX_SYSIOVEC_IOVLEN;
-            result->offheap_size += size;
+                result->iovec_len += 1 + size / MAX_SYSIOVEC_IOVLEN;
+                result->offheap_size += size;
+            }
         }
 
         result->sublist_length += 1;
         lookahead = CDR(cell);
 
-        if(result->sublist_length >= max_length) {
+        if (result->sublist_length >= max_length) {
             break;
         }
     }
@@ -3488,6 +3490,10 @@ static void inspect_raw_binary_data(Eterm binary, ErlNifBinary *result) {
     if (thing_subtag(*parent_header) == REFC_BINARY_SUBTAG) {
         ProcBin *pb = (ProcBin*)parent_header;
 
+        if (pb->flags & (PB_IS_WRITABLE | PB_ACTIVE_WRITER)) {
+            erts_emasculate_writable_binary(pb);
+        }
+
         ASSERT(pb->val != NULL);
         ASSERT(byte_offset < pb->size);
         ASSERT(&pb->bytes[byte_offset] >= (byte*)(pb->val)->orig_bytes);
@@ -3531,7 +3537,7 @@ static int fill_iovec_with_slice(ErlNifEnv *env,
 
         /* If this isn't a refc binary, copy its contents to the onheap buffer
          * and reference that instead. */
-        if (raw_data.ref_bin == NULL) {
+        if (raw_data.size > 0 && raw_data.ref_bin == NULL) {
             ASSERT(onheap_offset < onheap_data.size);
             ASSERT(slice->onheap_size > 0);
 
@@ -3542,12 +3548,11 @@ static int fill_iovec_with_slice(ErlNifEnv *env,
             raw_data.ref_bin = onheap_data.ref_bin;
         }
 
-        ASSERT(raw_data.ref_bin != NULL);
-
         while (raw_data.size > 0) {
             UWord chunk_len = MIN(raw_data.size, MAX_SYSIOVEC_IOVLEN);
 
             ASSERT(iovec_idx < iovec->iovcnt);
+            ASSERT(raw_data.ref_bin != NULL);
 
             iovec->iov[iovec_idx].iov_base = raw_data.data;
             iovec->iov[iovec_idx].iov_len = chunk_len;
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 1f8a756305..63e9275ac1 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -3417,7 +3417,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
     int thr_prgr_active = 1;
     erts_aint32_t flgs;
 #endif
-    ERTS_MSACC_PUSH_STATE_M();
+    ERTS_MSACC_PUSH_STATE();
 #ifdef ERTS_SMP
 
     ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
@@ -3542,9 +3542,9 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
 								     - 1) + 1;
 				} else
 				    timeout = -1;
-                                ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_SLEEP);
+                                ERTS_MSACC_SET_STATE_CACHED(ERTS_MSACC_STATE_SLEEP);
 				res = erts_tse_twait(ssi->event, timeout);
-                                ERTS_MSACC_POP_STATE_M();
+                                ERTS_MSACC_POP_STATE();
 				current_time = ERTS_SCHEDULER_IS_DIRTY(esdp) ? 0 :
 				    erts_get_monotonic_time(esdp);
 			    } while (res == EINTR);
@@ -3743,12 +3743,12 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
 
 	ASSERT(!erts_port_task_have_outstanding_io_tasks());
 
-	ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_CHECK_IO);
+	ERTS_MSACC_SET_STATE_CACHED(ERTS_MSACC_STATE_CHECK_IO);
         LTTNG2(scheduler_poll, esdp->no, 0);
 
 	erl_sys_schedule(0);
 
-	ERTS_MSACC_POP_STATE_M();
+	ERTS_MSACC_POP_STATE();
 
 	if (!ERTS_SCHEDULER_IS_DIRTY(esdp)) {
 	    ErtsMonotonicTime current_time = erts_get_monotonic_time(esdp);
@@ -10350,7 +10350,7 @@ Process *erts_schedule(ErtsSchedulerData *esdp, Process *p, int calls)
                                      | ERTS_PROC_LOCK_STATUS
                                      | ERTS_PROC_LOCK_TRACE));
 
-            ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_OTHER);
+            ERTS_MSACC_SET_STATE_CACHED(ERTS_MSACC_STATE_OTHER);
 
 #ifdef ERTS_SMP
             if (state & ERTS_PSFLG_FREE) {
@@ -10642,7 +10642,7 @@ Process *erts_schedule(ErtsSchedulerData *esdp, Process *p, int calls)
 	    case 0:			/* No process at all */
 	    default:
 		ASSERT(qmask == 0);
-                ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_OTHER);
+                ERTS_MSACC_SET_STATE_CACHED(ERTS_MSACC_STATE_OTHER);
 		goto check_activities_to_run;
 	    }
 
@@ -10766,7 +10766,7 @@ Process *erts_schedule(ErtsSchedulerData *esdp, Process *p, int calls)
 
 	}
 
-        ERTS_MSACC_SET_STATE_CACHED_M(ERTS_MSACC_STATE_EMULATOR);
+        ERTS_MSACC_SET_STATE_CACHED(ERTS_MSACC_STATE_EMULATOR);
 
 #ifdef ERTS_SMP