I newly installed Fedora 30 on a machine then I installed Oracle Database 12c and restored a really big dump (took two days). Then, I installed samba server and shared a folder with that.

After that, I rebooted the system for the first time, but it didn't boot up saying:

[!!!!!!] Failed to start up manager

and nothing else (the system freezes and doesn't respond to any key).

I can currently get a root shell by using rd.break kernel parameter and chrroting to sysroot, but I don't have networking and I can't use systemctl.

I also ran fsck on the computer's disk (using live os) and it says there is no error in filesystem.

I also found the code generating this error in systemd source code here.

How can I boot my system normally, get networking and systemctl working

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