Merge branch 'tor-github/pr/1346'

diff --cc src/app/config/config.c
index 6ee818ab0c68ec16d6147c72dfbd4c5e5ceeacd6,2416da2b26eaa38237f5a5284823d0572bb7b085..451593a5fa4194d74af2fc25f6e942657a115881
--- 1/src/app/config/config.c
--- 2/src/app/config/config.c
+++ b/src/app/config/config.c
@@@ -1197,9 -1187,28 +1197,13 @@@ init_protocol_warning_severity_level(vo
  static void
  cleanup_protocol_warning_severity_level(void)
  {
-    atomic_counter_destroy(&protocol_warning_severity_level);
+   /* Destroying a locked mutex is undefined behaviour. This mutex may be
+    * locked, because multiple threads can access it. But we need to destroy
+    * it, otherwise re-initialisation will trigger undefined behaviour.
+    * See #31735 for details. */
+   atomic_counter_destroy(&protocol_warning_severity_level);
  }
  
 -/** List of default directory authorities */
 -
 -static const char *default_authorities[] = {
 -#include "auth_dirs.inc"
 -  NULL
 -};
 -
 -/** List of fallback directory authorities. The list is generated by opt-in of
 - * relays that meet certain stability criteria.
 - */
 -static const char *default_fallbacks[] = {
 -#include "fallback_dirs.inc"
 -  NULL
 -};
 -
  /** Add the default directory authorities directly into the trusted dir list,
   * but only add them insofar as they share bits with <b>type</b>.
   * Each authority's bits are restricted to the bits shared with <b>type</b>.

diff --cc src/feature/relay/router.c
Simple merge

diff --cc src/lib/crypt_ops/crypto_openssl_mgt.c
Simple merge

diff --cc src/lib/thread/compat_threads.c
Simple merge