diegorusso
diff --git a/‎Include/internal/pycore_mimalloc.h
Copy file name to clipboardExpand all lines: Include/internal/pycore_mimalloc.h
+1-1Lines changed: 1 addition & 1 deletion b/‎Include/internal/pycore_mimalloc.h
Copy file name to clipboardExpand all lines: Include/internal/pycore_mimalloc.h
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎Objects/mimalloc/alloc.c
Copy file name to clipboardExpand all lines: Objects/mimalloc/alloc.c
+3Lines changed: 3 additions & 0 deletions b/‎Objects/mimalloc/alloc.c
Copy file name to clipboardExpand all lines: Objects/mimalloc/alloc.c
+3Lines changed: 3 additions & 0 deletions
@@ -27,7 +27,7 @@ typedef enum {
 #  define MI_DEBUG_FREED      PYMEM_DEADBYTE
 #  define MI_DEBUG_PADDING    PYMEM_FORBIDDENBYTE
 #ifdef Py_DEBUG
-#  define MI_DEBUG 1
+#  define MI_DEBUG 2
 #else
 #  define MI_DEBUG 0
 #endif
 
@@ -609,7 +609,10 @@ bool _mi_free_delayed_block(mi_block_t* block) {
   // get segment and page
   const mi_segment_t* const segment = _mi_ptr_segment(block);
   mi_assert_internal(_mi_ptr_cookie(segment) == segment->cookie);
+#ifndef Py_GIL_DISABLED
+  // The GC traverses heaps of other threads, which can trigger this assert.
   mi_assert_internal(_mi_thread_id() == segment->thread_id);
+#endif
   mi_page_t* const page = _mi_segment_page_of(segment, block);
 
   // Clear the no-delayed flag so delayed freeing is used again for this page.