bug#62711: Suspend-to-disk with LUKS-encrypted root doesn’t work

[Ludovic Courtès]

Hello!

Since my laptop’s battery died, I set up suspend-to-disk as documented
in the manual (info "(guix) Swap Space").  I use a swap file on top of
my LUKS-encrypted root partition, so I added:

     "resume=/swap"
     "resume_offset=OFFSET"

to my ‘kernel-arguments’ field, where OFFSET is given by ‘filefrag’.

However, when resuming, it looks as though the kernel is not even trying
to resume:

--8<---------------cut here---------------start------------->8---
Apr  7 14:29:47 localhost vmunix: [    0.000000] Linux version 6.2.9-gnu 
(guix@guix) (gcc (GCC) 10.3.0, GNU ld (GNU Binutils) 2.37) #1 SMP 
PREEMPT_DYNAMIC 1
Apr  7 14:29:47 localhost vmunix: [    0.000000] Command line: 
BOOT_IMAGE=/gnu/store/6441f00fkyg1r6jpj7f0qpa798svsggv-linux-libre-6.2.9/bzImage
 root=root gnu.system=/gnu/store/rsv7gc69ishn0cvd8151083i367zp0v2-system 
gnu.load=/gnu/store/rsv7gc69ishn0cvd8151083i367zp0v2-system/boot 
modprobe.blacklist=usbmouse,usbkbd,iwlwifi resume=/swap resume_offset=118786729 
quiet
Apr  7 14:29:47 localhost vmunix: [    0.000000] KERNEL supported cpus:
Apr  7 14:29:47 localhost vmunix: [    0.000000]   Intel GenuineIntel
Apr  7 14:29:47 localhost vmunix: [    0.000000]   AMD AuthenticAMD

[...]

Apr  7 14:29:47 localhost vmunix: [    0.043725] smpboot: Allowing 4 CPUs, 0 
hotplug CPUs
Apr  7 14:29:47 localhost vmunix: [    0.043748] PM: hibernation: Registered 
nosave memory: [mem 0x00000000-0x00000fff]
Apr  7 14:29:47 localhost vmunix: [    0.043750] PM: hibernation: Registered 
nosave memory: [mem 0x00058000-0x00058fff]
Apr  7 14:29:47 localhost vmunix: [    0.043753] PM: hibernation: Registered 
nosave memory: [mem 0x0009e000-0x0009efff]
Apr  7 14:29:47 localhost vmunix: [    0.043755] PM: hibernation: Registered 
nosave memory: [mem 0x000a0000-0x000fffff]
Apr  7 14:29:47 localhost vmunix: [    0.043757] PM: hibernation: Registered 
nosave memory: [mem 0xb8a36000-0xb8a3dfff]
Apr  7 14:29:47 localhost vmunix: [    0.043759] PM: hibernation: Registered 
nosave memory: [mem 0xc70fb000-0xc75fafff]
Apr  7 14:29:47 localhost vmunix: [    0.043760] PM: hibernation: Registered 
nosave memory: [mem 0xc75fb000-0xc7c7efff]
Apr  7 14:29:47 localhost vmunix: [    0.043761] PM: hibernation: Registered 
nosave memory: [mem 0xc7c7f000-0xc7e7efff]
Apr  7 14:29:47 localhost vmunix: [    0.043762] PM: hibernation: Registered 
nosave memory: [mem 0xc7e7f000-0xc7efefff]
Apr  7 14:29:47 localhost vmunix: [    0.043764] PM: hibernation: Registered 
nosave memory: [mem 0xc7f00000-0xcc7fffff]
Apr  7 14:29:47 localhost vmunix: [    0.043765] PM: hibernation: Registered 
nosave memory: [mem 0xcc800000-0xf80f9fff]
Apr  7 14:29:47 localhost vmunix: [    0.043766] PM: hibernation: Registered 
nosave memory: [mem 0xf80fa000-0xf80fafff]
Apr  7 14:29:47 localhost vmunix: [    0.043767] PM: hibernation: Registered 
nosave memory: [mem 0xf80fb000-0xf80fcfff]
Apr  7 14:29:47 localhost vmunix: [    0.043768] PM: hibernation: Registered 
nosave memory: [mem 0xf80fd000-0xf80fdfff]
Apr  7 14:29:47 localhost vmunix: [    0.043768] PM: hibernation: Registered 
nosave memory: [mem 0xf80fe000-0xfdffffff]
Apr  7 14:29:47 localhost vmunix: [    0.043769] PM: hibernation: Registered 
nosave memory: [mem 0xfe000000-0xfe010fff]
Apr  7 14:29:47 localhost vmunix: [    0.043770] PM: hibernation: Registered 
nosave memory: [mem 0xfe011000-0xffffffff]
Apr  7 14:29:47 localhost vmunix: [    0.043772] [mem 0xcc800000-0xf80f9fff] 
available for PCI devices
Apr  7 14:29:47 localhost vmunix: [    0.043773] Booting paravirtualized kernel 
on bare hardware
Apr  7 14:29:47 localhost vmunix: [    0.043775] clocksource: refined-jiffies: 
mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns
Apr  7 14:29:47 localhost vmunix: [    0.043785] setup_percpu: NR_CPUS:256 
nr_cpumask_bits:4 nr_cpu_ids:4 nr_node_ids:1
Apr  7 14:29:47 localhost vmunix: [    0.044150] percpu: Embedded 57 pages/cpu 
s194792 r8192 d30488 u524288
Apr  7 14:29:47 localhost vmunix: [    0.044189] Fallback order for Node 0: 0 
Apr  7 14:29:47 localhost vmunix: [    0.044192] Built 1 zonelists, mobility 
grouping on.  Total pages: 4098520
Apr  7 14:29:47 localhost vmunix: [    0.044193] Policy zone: Normal
Apr  7 14:29:47 localhost vmunix: [    0.044194] Kernel command line: 
BOOT_IMAGE=/gnu/store/6441f00fkyg1r6jpj7f0qpa798svsggv-linux-libre-6.2.9/bzImage
 root=root gnu.system=/gnu/store/rsv7gc69ishn0cvd8151083i367zp0v2-system 
gnu.load=/gnu/store/rsv7gc69ishn0cvd8151083i367zp0v2-system/boot 
modprobe.blacklist=usbmouse,usbkbd,iwlwifi resume=/swap resume_offset=118786729 
quiet
Apr  7 14:29:47 localhost vmunix: [    0.044318] Unknown kernel command line 
parameters 
"BOOT_IMAGE=/gnu/store/6441f00fkyg1r6jpj7f0qpa798svsggv-linux-libre-6.2.9/bzImage",
 will be passed to user space.
Apr  7 14:29:47 localhost vmunix: [    0.044342] random: crng init done

[...]

Apr  7 14:29:47 localhost vmunix: [    0.946203] sd 2:0:0:0: Attached scsi 
generic sg0 type 0
Apr  7 14:29:47 localhost vmunix: [    0.946436] sd 2:0:0:0: [sda] 1000215216 
512-byte logical blocks: (512 GB/477 GiB)
Apr  7 14:29:47 localhost vmunix: [    0.946447] sd 2:0:0:0: [sda] 4096-byte 
physical blocks
Apr  7 14:29:47 localhost vmunix: [    0.946490] sd 2:0:0:0: [sda] Write 
Protect is off
Apr  7 14:29:47 localhost vmunix: [    0.946722] sd 2:0:0:0: [sda] Write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA
Apr  7 14:29:47 localhost vmunix: [    0.946873] sd 2:0:0:0: [sda] Preferred 
minimum I/O size 4096 bytes
Apr  7 14:29:47 localhost vmunix: [    0.969038]  sda: sda1 sda2 sda3
Apr  7 14:29:47 localhost vmunix: [    0.969435] sd 2:0:0:0: [sda] Attached 
SCSI disk
Apr  7 14:29:47 localhost vmunix: [    0.974847] usbcore: registered new 
interface driver usb-storage

[...]

Apr  7 14:29:47 localhost vmunix: [    2.106128] usb 1-9: Manufacturer: Generic
Apr  7 14:29:47 localhost vmunix: [    2.106132] usb 1-9: SerialNumber: 
200901010001
Apr  7 14:29:47 localhost vmunix: [   13.073755] EXT4-fs (dm-0): mounted 
filesystem d25675c9-c26a-487d-a6e4-0bab06b2474b with ordered data mode. Quota 
mode: none.
Apr  7 14:29:47 localhost vmunix: [   14.350824] shepherd[1]: Starting service 
root...
Apr  7 14:29:47 localhost vmunix: [   14.351331] shepherd[1]: Service root 
started.
Apr  7 14:29:47 localhost vmunix: [   14.351787] shepherd[1]: Service root 
running with value #t.
Apr  7 14:29:47 localhost vmunix: [   14.353268] shepherd[1]: Service root has 
been started.
Apr  7 14:29:47 localhost vmunix: [   14.806435] shepherd[1]: starting 
services...
Apr  7 14:29:47 localhost vmunix: [   14.810401] shepherd[1]: Starting service 
user-file-systems...
Apr  7 14:29:47 localhost vmunix: [   14.813909] shepherd[1]: Starting service 
root-file-system...
Apr  7 14:29:47 localhost vmunix: [   14.814404] shepherd[1]: Starting service 
host-name...
Apr  7 14:29:47 localhost vmunix: [   14.815015] shepherd[1]: Starting service 
sysctl...
Apr  7 14:29:47 localhost vmunix: [   14.815373] shepherd[1]: Starting service 
loopback...
--8<---------------cut here---------------end--------------->8---

Hibernation (with ‘echo disk > /sys/power/state’) did seem to succeed,
with this one message:

--8<---------------cut here---------------start------------->8---
Apr  7 12:39:30 localhost vmunix: [14219.893014] PM: hibernation: hibernation 
entry
--8<---------------cut here---------------end--------------->8---

Am I missing something?

Thanks,
Ludo’.