I just pull and configured my system and get the same problem.
New session c1 of user gdm.
Removed session c1.
"/var/log/messages" shows the following messages between some ntpd messages:
Apr 15 22:31:06 localhost gdm: Child process -537 was already dead.
Apr 15 22:35:29 localhost gdm: Child process -558 was already dead.
Apr 15 22:39:14 localhost gdm: Child process -538 was already dead.
$ guix describe
Generation 71 Apr 15 2020 21:34:09 (current)
sirgazil-x 66d4b67
repository URL: https://gitlab.com/sirgazil/guix-channel-x.git
branch: master
commit: 66d4b677875c84d0b7a946376cd4885f202094eb
guix 8080c03
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 8080c03d14ccdd7897a902966ea4aeea8dbfd359
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https://sirgazil.bitbucket.io/
