NixOS
diff --git a/nixos/modules/system/boot/kexec.nix b/nixos/modules/system/boot/kexec.nix
@@ -13,8 +13,18 @@
         path = [ pkgs.kexectools ];
         script =
           ''
+            # Don't load the current system profile if we already have a kernel loaded
+            if [[ 1 = "$(</sys/kernel/kexec_loaded)" ]] ; then
+              echo "kexec kernel has already been loaded, prepare-kexec skipped"
+              exit 0
+            fi
+
             p=$(readlink -f /nix/var/nix/profiles/system)
-            if ! [ -d $p ]; then exit 1; fi
+            if ! [[ -d $p ]]; then
+              echo "Could not find system profile for prepare-kexec"
+              exit 1
+            fi
+            echo "Loading NixOS system via kexec."
             exec kexec --load $p/kernel --initrd=$p/initrd --append="$(cat $p/kernel-params) init=$p/init"
           '';
       };

diff --git a/pkgs/applications/audio/flacon/default.nix b/pkgs/applications/audio/flacon/default.nix
@@ -5,13 +5,13 @@
 
 stdenv.mkDerivation rec {
   name = "flacon-${version}";
-  version = "5.2.0";
+  version = "5.4.0";
 
   src = fetchFromGitHub {
     owner = "flacon";
     repo = "flacon";
     rev = "v${version}";
-    sha256 = "0vmbwpfjq66qv3zp7mss3hsxy6dxjybqfm7k2xyc0w181qclg1ya";
+    sha256 = "1j8gzk92kn10yb7rmvrnyq0ipda2swnkmsavqsk5ws0z600p3k93";
   };
 
   nativeBuildInputs = [ cmake pkgconfig makeWrapper ];