Your bug report

#30874: Displaying char \x274C with Dejavu Sans Mono gives "X protocol error: BadLength (poly request too large or internal Xlib length error) on protocol request 138"

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 30874@debbugs.gnu.org.

-- 
30874: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=30874
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