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-rw-r--r--src/script/cpp_api/s_env.cpp4
-rw-r--r--src/script/lua_api/l_env.cpp4
2 files changed, 7 insertions, 1 deletions
diff --git a/src/script/cpp_api/s_env.cpp b/src/script/cpp_api/s_env.cpp
index 82d0d4f0e..913d8539d 100644
--- a/src/script/cpp_api/s_env.cpp
+++ b/src/script/cpp_api/s_env.cpp
@@ -212,11 +212,13 @@ void ScriptApiEnv::on_emerge_area_completion(
{
Server *server = getServer();
+ // This function should be executed with envlock held.
+ // The caller (LuaEmergeAreaCallback in src/script/lua_api/l_env.cpp)
+ // should have obtained the lock.
// Note that the order of these locks is important! Envlock must *ALWAYS*
// be acquired before attempting to acquire scriptlock, or else ServerThread
// will try to acquire scriptlock after it already owns envlock, thus
// deadlocking EmergeThread and ServerThread
- MutexAutoLock envlock(server->m_env_mutex);
SCRIPTAPI_PRECHECKHEADER
diff --git a/src/script/lua_api/l_env.cpp b/src/script/lua_api/l_env.cpp
index f6ea23e95..68d10308c 100644
--- a/src/script/lua_api/l_env.cpp
+++ b/src/script/lua_api/l_env.cpp
@@ -137,6 +137,10 @@ void LuaEmergeAreaCallback(v3s16 blockpos, EmergeAction action, void *param)
assert(state->script != NULL);
assert(state->refcount > 0);
+ // state must be protected by envlock
+ Server *server = state->script->getServer();
+ MutexAutoLock envlock(server->m_env_mutex);
+
state->refcount--;
state->script->on_emerge_area_completion(blockpos, action, state);