`gcc -DMJS_MAIN mjs.c -fsanitize=address -ldl -g -o mjs-bin`

mjs-bin -f poc

AddressSanitizer:DEADLYSIGNAL
``` =================================================================
==239472==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x7f07ef24cdcd bp 0x7ffd13f032e8 sp 0x7ffd13f03298 T0)
==239472==The signal is caused by a READ memory access.
==239472==Hint: this fault was caused by a dereference of a high value address (see register values below).  Dissassemble the provided pc to learn which register was used.
    #0 0x7f07ef24cdcd in _IO_str_init_static_internal /build/glibc-LcI20x/glibc-2.31/libio/strops.c:46
    #1 0x7f07ef244f89 in __vsnprintf_internal /build/glibc-LcI20x/glibc-2.31/libio/vsnprintf.c:113
    #2 0x7f07ef40f30d in __interceptor___vsnprintf_chk ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1669
    #3 0x563cfda6f710 in vsnprintf /usr/include/x86_64-linux-gnu/bits/stdio2.h:80
    #4 0x563cfda6f710 in json_vprintf /home/lowry/Documents/HTFuzz/program/mjs/code/mjs.c:6275
    #5 0x563cfda723fe in json_printf /home/lowry/Documents/HTFuzz/program/mjs/code/mjs.c:6372
    #6 0x563cfda96a5e in mjs_jprintf /home/lowry/Documents/HTFuzz/program/mjs/code/mjs.c:14408
    #7 0x563cfda97250 in mjs_fprintf /home/lowry/Documents/HTFuzz/program/mjs/code/mjs.c:14445
    #8 0x563cfda97250 in mjs_print /home/lowry/Documents/HTFuzz/program/mjs/code/mjs.c:7995
    #9 0xfffa27e0867  (<unknown module>)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /build/glibc-LcI20x/glibc-2.31/libio/strops.c:46 in _IO_str_init_static_internal
==239472==ABORTING