···

       
18
       
18
       
 
       
          default = false;

     

       
19
       
19
       
 
       
          description = ''

     

       
20
       
20
       
 
       
            If enabled, NixOS will set up a kernel that will

     

       
21
       
21
       
-
       
            boot on crash, and leave the user to a stage1 debug1devices

     

       
22
       
22
       
-
       
            interactive shell to be able to save the crashed kernel dump.

     

       
21
       
21
       
+
       
            boot on crash, and leave the user in systemd rescue

     

       
22
       
22
       
+
       
            to be able to save the crashed kernel dump at

     

       
23
       
23
       
+
       
            /proc/vmcore.

     

       
23
       
24
       
 
       
            It also activates the NMI watchdog.

     

       
24
       
25
       
 
       
          '';

     

       
25
       
26
       
 
       
        };

     

       
26
       
26
       
-
       
        kernelPackages = mkOption {

     

       
27
       
27
       
-
       
          type = types.package;

     

       
28
       
28
       
-
       
          default = pkgs.linuxPackages;

     

       
29
       
29
       
-
       
          # We don't want to evaluate all of linuxPackages for the manual

     

       
30
       
30
       
-
       
          # - some of it might not even evaluate correctly.

     

       
31
       
31
       
-
       
          defaultText = "pkgs.linuxPackages";

     

       
32
       
32
       
-
       
          example = literalExample "pkgs.linuxPackages_2_6_25";

     

       
27
       
27
       
+
       
        reservedMemory = mkOption {

     

       
28
       
28
       
+
       
          default = "128M";

     

       
33
       
29
       
 
       
          description = ''

     

       
34
       
34
       
-
       
            This will override the boot.kernelPackages, and will add some

     

       
35
       
35
       
-
       
            kernel configuration parameters for the crash dump to work.

     

       
30
       
30
       
+
       
            The amount of memory reserved for the crashdump kernel.

     

       
31
       
31
       
+
       
            If you choose a too high value, dmesg will mention

     

       
32
       
32
       
+
       
            "crashkernel reservation failed".

     

       
36
       
33
       
 
       
          '';

     

       
37
       
34
       
 
       
        };

     

       
38
       
35
       
 
       
        kernelParams = mkOption {

     

       
39
       
36
       
 
       
          type = types.listOf types.str;

     

       
40
       
40
       
-
       
          default = [ "debug1devices" ];

     

       
37
       
37
       
+
       
          default = [ "1" "boot.shell_on_fail" ];

     

       
41
       
38
       
 
       
          description = ''

     

       
42
       
39
       
 
       
            Parameters that will be passed to the kernel kexec-ed on crash.

     

       
43
       
40
       
 
       
          '';

     
···

       
51
       
48
       
 
       
  config = mkIf crashdump.enable {

     

       
52
       
49
       
 
       
    boot = {

     

       
53
       
50
       
 
       
      postBootCommands = ''

     

       
51
       
51
       
+
       
        echo "loading crashdump kernel...";

     

       
54
       
52
       
 
       
        ${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \

     

       
55
       
53
       
 
       
        --initrd=/run/current-system/initrd \

     

       
56
       
56
       
-
       
        --append="init=$(readlink -f /run/current-system/init) system=$(readlink -f /run/current-system) irqpoll maxcpus=1 reset_devices ${kernelParams}" --reset-vga --console-vga

     

       
54
       
54
       
+
       
        --reset-vga --console-vga \

     

       
55
       
55
       
+
       
        --command-line="systemConfig=$(readlink -f /run/current-system) init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"

     

       
57
       
56
       
 
       
      '';

     

       
58
       
57
       
 
       
      kernelParams = [

     

       
59
       
59
       
-
       
       "crashkernel=64M"

     

       
58
       
58
       
+
       
       "crashkernel=${crashdump.reservedMemory}"

     

       
60
       
59
       
 
       
       "nmi_watchdog=panic"

     

       
61
       
60
       
 
       
       "softlockup_panic=1"

     

       
62
       
61
       
 
       
       "idle=poll"

     

       
63
       
62
       
 
       
      ];

     

       
64
       
64
       
-
       
      kernelPackages = mkOverride 50 (crashdump.kernelPackages // {

     

       
65
       
65
       
-
       
        kernel = crashdump.kernelPackages.kernel.override 

     

       
66
       
66
       
-
       
          (attrs: {

     

       
67
       
67
       
-
       
            extraConfig = (optionalString (attrs ? extraConfig) attrs.extraConfig) +

     

       
68
       
68
       
-
       
              ''

     

       
63
       
63
       
+
       
      kernelPatches = [ {

     

       
64
       
64
       
+
       
        name = "crashdump-config";

     

       
65
       
65
       
+
       
        patch = null;

     

       
66
       
66
       
+
       
        extraConfig = ''

     

       
69
       
67
       
 
       
                CRASH_DUMP y

     

       
70
       
68
       
 
       
                DEBUG_INFO y

     

       
71
       
69
       
 
       
                PROC_VMCORE y

     

       
72
       
70
       
 
       
                LOCKUP_DETECTOR y

     

       
73
       
71
       
 
       
                HARDLOCKUP_DETECTOR y

     

       
74
       
72
       
 
       
              '';

     

       
75
       
75
       
-
       
          });

     

       
76
       
76
       
-
       
      });

     

       
73
       
73
       
+
       
        } ];

     

       
77
       
74
       
 
       
    };

     

       
78
       
75
       
 
       
  };

     

       
79
       
76
       
 
       
}