init: Id "x" respawning too fast: disabled for 5 minutes

Problem:
when upgrade glib2.0-1.6 to glib2.0-2.4 mannully(override the raw libs),
Fedora crashed,when reboot system,cannot login x-window, and cannot input account & password,just as follows:
init: Id "x" respawning too fast: disabled for 5 minutes.
...
/etc/x11/prefdm
localhost login:
(no response when input anything)
...

Solution:
grub menu shows,enter e to edit boot entry;
select the line with kernel...,press e to edit it;
append " single" to the line(remove quote), press b to boot in single use mode;
after system booted, cd /root and check .bash_history to see history operation;
i just re-copy the new glib again and reboot to solve the problem.

 

It cost me a whole afternoon ^^,Good luck! Hope this will help u...