From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Subject: bug#39708: nfs-service-type broken: rpc.mountd respawns too quickly
Date: Sat, 07 Mar 2020 23:03:44 -0500
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 39708@debbugs.gnu.org

I think I've gathered a clue!

scheme@(guix-user)> ,m (shepherd service)
scheme@(shepherd service)> (system "pidof rpc.mountd")
413 408 406 404 399 389 387
$1 = 0
scheme@(shepherd service)> (system "killall rpc.mountd")
$2 = 0
scheme@(shepherd service)> (system "pidof rpc.mountd")
$3 = 256
[...]
scheme@(shepherd service)> (make-forkexec-constructor
  (list "/gnu/store/qyz1bncxlkxv44c03sva2akfsyqzkzh5-nfs-utils-2.4.2/sbin/rpc.mountd" "--debug" "all"))
$5 = #<procedure 7f67f82862a0 at shepherd/service.scm:930:8 args>
scheme@(shepherd service)> ($5)
$6 = 816
scheme@(shepherd service)> (system "pidof rpc.mountd")
warning: 'waitpid' -1 failed unexpectedly: No child processes
817
warning: 'waitpid' -1 failed unexpectedly: No child processes
$7 = 0

[...]

scheme@(shepherd service)> (system "pgrep rpc.mountd")
817
warning: 'waitpid' -1 failed unexpectedly: No child processes
$10 = 0
scheme@(shepherd service)>

That warning thrown by Guile/Shepherd is our clue.  To be continued :-).

Maxim