shutdown: unregister all binfmt_misc entries before entering shutdown loop

Apparently if the new "F" flag is used they might pin files, which
blocks us from unmounting things. Let's hence clear this up explicitly.
Before entering our umount loop.

Fixes: #14981

diff --git a/src/shutdown/shutdown.c b/src/shutdown/shutdown.c
index f2ad23d05570e82e9e96b3bc2fea158184a960bb..be8ae75e04ab72488d7703cf68a05cdd8bdd679a 100644 (file)
--- a/src/shutdown/shutdown.c
+++ b/src/shutdown/shutdown.c
@@ -16,6 +16,7 @@
 
 #include "alloc-util.h"
 #include "async.h"
+#include "binfmt-util.h"
 #include "cgroup-setup.h"
 #include "cgroup-util.h"
 #include "def.h"
@@ -386,6 +387,7 @@ int main(int argc, char *argv[]) {
                 sync_with_progress();
 
         disable_coredumps();
+        disable_binfmt();
 
         log_info("Sending SIGTERM to remaining processes...");
         broadcast_signal(SIGTERM, true, true, arg_timeout);