From ccecdaf04411b65f5badbeaae36f50c9c216d37b Mon Sep 17 00:00:00 2001
From: Ivan Maidanski <ivmai@mail.ru>
Date: Mon, 3 Oct 2022 21:31:34 +0300
Subject: Fix missing lock while updating GC_in_thread_creation in
 GC_exit_check (fix of commit 8e6460052)

* misc.c [!DONT_USE_ATEXIT && THREADS] (GC_exit_check): Wrap each
update of GC_in_thread_creation into LOCK/UNLOCK (but not GC_gcollect
call); add comment.
---
 misc.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/misc.c b/misc.c
index 8b02f53e..b542819d 100644
--- a/misc.c
+++ b/misc.c
@@ -766,11 +766,19 @@ GC_API int GC_CALL GC_is_init_called(void)
   {
     if (GC_find_leak && !skip_gc_atexit) {
 #     ifdef THREADS
+        DCL_LOCK_STATE;
+
+        /* GC_in_thread_creation should always be updated holding the   */
+        /* lock even if we are about to exit.                           */
+        LOCK();
         GC_in_thread_creation = TRUE; /* OK to collect from unknown thread. */
-        GC_gcollect();
+        UNLOCK();
+#     endif
+      GC_gcollect();
+#     ifdef THREADS
+        LOCK();
         GC_in_thread_creation = FALSE;
-#     else
-        GC_gcollect();
+        UNLOCK();
 #     endif
     }
   }
-- 
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