1 files changed, 4 insertions, 0 deletions
diff --git a/infra/libkookie/nixpkgs/nixos/modules/security/hidepid.nix b/infra/libkookie/nixpkgs/nixos/modules/security/hidepid.nix
index 55a48ea3c9c6..4953f517e93b 100644
--- a/infra/libkookie/nixpkgs/nixos/modules/security/hidepid.nix
+++ b/infra/libkookie/nixpkgs/nixos/modules/security/hidepid.nix
@@ -23,5 +23,9 @@ with lib;
 
     boot.specialFileSystems."/proc".options = [ "hidepid=2" "gid=${toString config.ids.gids.proc}" ];
     systemd.services.systemd-logind.serviceConfig.SupplementaryGroups = [ "proc" ];
+
+    # Disable cgroupsv2, which doesn't work with hidepid.
+    # https://github.com/NixOS/nixpkgs/pull/104094#issuecomment-729996203
+    systemd.enableUnifiedCgroupHierarchy = false;
   };
 }