crash-handler: also disable dlopen(), just in case

src/core/crash-handler.c

@@ -7,6 +7,7 @@
 
 #include "constants.h"
 #include "crash-handler.h"
+#include "dlfcn-util.h"
 #include "exit-status.h"
 #include "format-util.h"
 #include "log.h"
@@ -70,6 +71,9 @@ _noreturn_ static void crash(int sig, siginfo_t *siginfo, void *context) {
          * memory allocation is not async-signal-safe anyway — see signal-safety(7) for details —, and thus
          * is not permissible in signal handlers.) */
 
+        block_dlopen(); /* paranoia: never end up doing dlopen() as side-effect from some call anymore from
+                         * here */
+
         if (getpid_cached() != 1)
                 /* Pass this on immediately, if this is not PID 1 */
                 propagate_signal(sig, siginfo);