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Compile the following t.el file: (require 'cl-lib) (put 's 'buf "abcd") (cl-callf2 cl-concatenate 'string (get 's 'buf) "efg") (provide 't) 2. Load the compiled t.elc file Crash on centos7: Fatal error 11: Segmentation fault Backtrace: emacs[0x80e40be] emacs[0x80ccbfd] emacs[0x80e2c67] emacs[0x80e2ebe] emacs[0x80e2ee6] [0xf77e0410] emacs[0x813a17a] emacs[0x816bffe] emacs[0x816ddc7] emacs[0x8139908] emacs[0x815afc8] emacs[0x815b42e] emacs[0x813b1f4] emacs[0x813a2ac] emacs[0x816bffe] emacs[0x8139ebb] emacs[0x813a22b] emacs[0x816bffe] emacs[0x8139ebb] emacs[0x813a22b] emacs[0x816bffe] emacs[0x8139ebb] emacs[0x813a22b] emacs[0x81364fb] emacs[0x813a2ac] emacs[0x8136e9f] emacs[0x813a2ac] emacs[0x816bffe] emacs[0x8139fdd] emacs[0x813a22b] emacs[0x813a387] emacs[0x80d9b72] emacs[0x8138afe] emacs[0x80ccfa4] emacs[0x8138abb] emacs[0x80ccf61] emacs[0x80d116e] emacs[0x80d146c] emacs[0x804cc03] /lib/libc.so.6(__libc_start_main+0xf3)[0xf75869a3] emacs[0x804db03] ... Segmentation fault