diff options
Diffstat (limited to 'nixos/modules/misc/crashdump.nix')
-rw-r--r-- | nixos/modules/misc/crashdump.nix | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/nixos/modules/misc/crashdump.nix b/nixos/modules/misc/crashdump.nix new file mode 100644 index 000000000000..6e71baa9a431 --- /dev/null +++ b/nixos/modules/misc/crashdump.nix @@ -0,0 +1,78 @@ +{pkgs, config, ...}: + +with pkgs.lib; + +let + crashdump = config.boot.crashDump; + + kernelParams = concatStringsSep " " crashdump.kernelParams; + +in +###### interface +{ + options = { + boot = { + crashDump = { + enable = mkOption { + type = types.bool; + default = false; + description = '' + If enabled, NixOS will set up a kernel that will + boot on crash, and leave the user to a stage1 debug1devices + interactive shell to be able to save the crashed kernel dump. + It also activates the NMI watchdog. + ''; + }; + kernelPackages = mkOption { + default = pkgs.linuxPackages; + # We don't want to evaluate all of linuxPackages for the manual + # - some of it might not even evaluate correctly. + defaultText = "pkgs.linuxPackages"; + example = "pkgs.linuxPackages_2_6_25"; + description = '' + This will override the boot.kernelPackages, and will add some + kernel configuration parameters for the crash dump to work. + ''; + }; + kernelParams = mkOption { + type = types.listOf types.str; + default = [ "debug1devices" ]; + description = '' + Parameters that will be passed to the kernel kexec-ed on crash. + ''; + }; + }; + }; + }; + +###### implementation + + config = mkIf crashdump.enable { + boot = { + postBootCommands = '' + ${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \ + --initrd=/run/current-system/initrd \ + --append="init=$(readlink -f /run/current-system/init) system=$(readlink -f /run/current-system) irqpoll maxcpus=1 reset_devices ${kernelParams}" --reset-vga --console-vga + ''; + kernelParams = [ + "crashkernel=64M" + "nmi_watchdog=panic" + "softlockup_panic=1" + "idle=poll" + ]; + kernelPackages = mkOverride 50 (crashdump.kernelPackages // { + kernel = crashdump.kernelPackages.kernel.override + (attrs: { + extraConfig = (optionalString (attrs ? extraConfig) attrs.extraConfig) + + '' + CRASH_DUMP y + DEBUG_INFO y + PROC_VMCORE y + LOCKUP_DETECTOR y + HARDLOCKUP_DETECTOR y + ''; + }); + }); + }; + }; +} |