Enable sysrq for debugging.

common/cifs-client.nix

@@ -1,7 +1,7 @@
 { pkgs, ... }:
 let
   # this line prevents hanging on network split
-  automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.mount-timeout=5s";
+  automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.mount-timeout=5s,nobrl";
 in
 {
   environment.systemPackages = [ pkgs.cifs-utils ];

hosts/beefy/default.nix

@@ -18,4 +18,7 @@
   networking.hostName = "beefy";
   networking.cluster.primaryInterface = "enp1s0";
   services.tailscaleAutoconnect.authkey = "tskey-auth-k79UsDTw2v11CNTRL-oYqji35BE9c7CqM89Dzs9cBF14PmqYsi";
+
+  # Enable all SysRq functions for debugging hangs
+  boot.kernel.sysctl."kernel.sysrq" = 1;
 }