Backtrace:
In ice-9/boot-9.scm:
1724: 19 [%start-stack load-stack ...]
1729: 18 [#<procedure 151cea0 ()>]
In unknown file:
   ?: 17 [primitive-load "/home/leo/work/guix/scripts/guix"]
In guix/ui.scm:
1201: 16 [run-guix-command system "vm" "/home/leo/tmp/bare-bones.scm"]
In ice-9/boot-9.scm:
 157: 15 [catch srfi-34 #<procedure 31d2e20 at guix/ui.scm:425:2 ()> ...]
 157: 14 [catch system-error ...]
In guix/scripts/system.scm:
 882: 13 [#<procedure 3f1f7b0 at guix/scripts/system.scm:874:2 ()>]
 788: 12 [process-action vm ("/home/leo/tmp/bare-bones.scm") ...]
In guix/store.scm:
1163: 11 [run-with-store # ...]
In guix/scripts/system.scm:
 800: 10 [#<procedure 3f72660 at guix/scripts/system.scm:792:8 (state)> #]
 564: 9 [perform-action vm # # ...]
In gnu/system/vm.scm:
 496: 8 [system-qemu-image/shared-store-script # # # ...]
In gnu/system.scm:
 601: 7 [operating-system-derivation # # #f]
In gnu/services.scm:
 573: 6 [loop #]
In srfi/srfi-1.scm:
 578: 5 [map #<procedure loop (sink)> (# # #)]
In gnu/services.scm:
 573: 4 [loop #<<service> type: # parameters: #>]
In srfi/srfi-1.scm:
 578: 3 [map #<procedure loop (sink)> (# # #)]
In gnu/services.scm:
 573: 2 [loop #<<service> type: # parameters: ()>]
In srfi/srfi-1.scm:
 578: 1 [map #<procedure 2dbfcc0 at gnu/services.scm:562:4 (service)> (# # # # ...)]
In gnu/services/base.scm:
1217: 0 [urandom-seed-shepherd-service #f]

gnu/services/base.scm:1217:0: In procedure urandom-seed-shepherd-service:
gnu/services/base.scm:1217:0: Wrong number of arguments to #<procedure urandom-seed-shepherd-service ()>