commit 4c2509882fd9768a067ce8cb7cb40394e1cf3862
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Aug 18 13:52:02 2025 +0200

    elf: Preserve _rtld_global layout for the release branch
    
    Backporting commit 97017da5ef946c6d38c252f56c8cb7c205b732fa
    ("elf: Introduce _dl_debug_change_state") removed the
    _ns_debug member.  Keep it to preseve struct layout.

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 043abd369700ad58..b4c6e6d2ca7a1fec 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -350,6 +350,8 @@ struct rtld_global
       size_t n_elements;
       void (*free) (void *);
     } _ns_unique_sym_table;
+    /* Keep track of changes to each namespace' list.  */
+    struct r_debug_extended _ns_debug_unused;
   } _dl_ns[DL_NNS];
   /* One higher than index of last used namespace.  */
   EXTERN size_t _dl_nns;