fix_share_tls_block

src/butil/iobuf.cpp

@@ -366,9 +366,13 @@ inline IOBuf::Block* share_tls_block() {
     }
     IOBuf::Block* new_block = NULL;
     if (b) {
-        new_block = b->portal_next;
-        b->dec_ref();
-        --tls_data.num_blocks;
+        new_block = b;
+        while (new_block && new_block->full()) {
+            IOBuf::Block* const saved_next = new_block->portal_next;
+            new_block->dec_ref();
+            --tls_data.num_blocks;
+            new_block = saved_next;
+        }
     } else if (!tls_data.registered) {
         tls_data.registered = true;
         // Only register atexit at the first time