master: Add an assertion

The branch "master" has been updated in SBCL:
       via  d21baee18414dab4cb86d28dbcb8672f7a177c95 (commit)
      from  6fcc8d928b91ee5fbee5ab8453f80aa16e0b3d31 (commit)

- Log -----------------------------------------------------------------
commit d21baee18414dab4cb86d28dbcb8672f7a177c95
Author: Stas Boukarev <[email protected]>
Date:   Tue Aug 25 03:58:14 2026 +0300

    Add an assertion
---
 src/runtime/stop-the-world.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/runtime/stop-the-world.c b/src/runtime/stop-the-world.c
index 7b6876050..4b27cb5c8 100644
--- a/src/runtime/stop-the-world.c
+++ b/src/runtime/stop-the-world.c
@@ -123,8 +123,11 @@ sig_stop_for_gc_handler(int __attribute__((unused)) signal,
 #ifdef LISP_FEATURE_NONSTOP_FOREIGN_CALL
     /* The stop signal was already processed by
        handle_foreign_call_trigger */
-    if (!atomic_load(&stopping_the_world))
+    if (!atomic_load(&stopping_the_world)) {
+        gc_assert(read_TLS(STOP_FOR_GC_PENDING, get_sb_vm_thread()) == NIL);
+        gc_assert(read_TLS(GC_PENDING, get_sb_vm_thread()) == NIL);
         return;
+    }
 #endif
 
     struct thread *thread = get_sb_vm_thread();

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