bug#44927: Guix reboot stops with some errors

[znavko--- via Bug reports for GNU Guix <bug-guix@gnu.org>]

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Hello!
I have a trouble that I cannot solve and did not have such before.
When I reboot or power off my pc the process of shutdown stops with lines of 'call trace' (in attach).
It happened today after hundreds of tries of update with network errors (from guix server as I think)
https://lists.gnu.org/archive/html/help-guix/2020-11/msg00220.html

I just added another disk to my system, it works fine.
But something happened.
Please where to dig?

Config is in attach.

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;-*- mode: Scheme; -*-
;;this is znavko's cute config
;; for lightweight xfce4 desktop
;; without networkmanager but wpa_supplicant + dhcp-client instead
;; notebok settings: disabling sleep on closing lid
;; disabling pc-speaker, lenovo wifi blocking solution
;; enabling touchpad tapping

(use-modules (gnu) (gnu system nss)
	     (gnu system locale) ;;for locale-definition
	     (gnu services desktop)
	     (srfi srfi-1)	       ;;for remove function
	     (gnu services networking) ;;for remove ntp
	     (gnu services avahi)      ;;for remove avahi
	     (gnu services xorg)
	     (gnu packages admin) ;;for wpa_supplicant
	     )

(use-service-modules desktop)
(use-package-modules certs gnome)

(operating-system (host-name "antelope") (timezone "Europe/Moscow") (locale "en_US.utf8")
		  (bootloader (bootloader-configuration (bootloader grub-efi-bootloader) (target "/boot/efi")))
		  (file-systems (cons* 
					(file-system (device "/dev/sda1") (mount-point "/boot/efi") (type "vfat"))
					(file-system (device "/dev/sda2") (mount-point "/") (type "ext4")) 
					(file-system (device "/dev/sdb1") (mount-point "/home/bob/disk1") (type "ext4"))
					(file-system (device "/dev/sdc1") (mount-point "/home/bob/disk2") (type "ext4")) 
				%base-file-systems))

		  (swap-devices '("/dev/sda3"))

		  (users (cons* (user-account (name "bob") (group "users")
					      (supplementary-groups '("wheel" "netdev" "audio" "video"))
					      (home-directory "/home/bob"))
				(user-account (name "mom") (group "users")
					      (supplementary-groups '("wheel" "netdev" "audio" "video"))
					      (home-directory "/home/mom"))
				%base-user-accounts))

		  ;; This is where we specify system-wide packages.
		  (packages (cons* nss-certs ;for HTTPS access
				   gvfs	     ;for user mounts
				   wpa-supplicant
				   %base-packages))

		  (services (cons* 
			     ;; xfce4 desktop, dhcp-client, slim
			     (service xfce-desktop-service-type)
			     (service dhcp-client-service-type)
			     (service slim-service-type)

			     (modify-services      
			      ;; removing unnecessary services
			      (remove (lambda (service)
					(member (service-kind service)
						(list ntp-service-type avahi-service-type 
						      bluetooth-service network-manager-service-type
						      gdm-service-type)))
				      %desktop-services) ;end of remove lambda services

			      ;; wpa_supplicant + dhcp-client (above) instead of networkmanager
			      (wpa-supplicant-service-type config =>
							   (wpa-supplicant-configuration
							    (interface "wlp0s20f0u1")
							    (config-file "/etc/wpa_supplicant/wpa_supplicant.conf")))

			      )	;;end of modify-services
			     ))	;;end of services

		  ;; Allow resolution of '.local' host names with mDNS.
		  (name-service-switch %mdns-host-lookup-nss)

		  ;;blacklist ugly sound speaker, blacklist ideapad_laptop for prevent soft blocking wlan
		  (kernel-arguments '("modprobe.blacklist=pcspkr,snd_pcsp,bluetooth"))

		  ) ;;end of operating-system