Segmentation fault when dealing with hex-ANSII conversion about grammar-mutator HOT 12 CLOSED

(gdb) bt
#0  __memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:384
#1  0x00007fffeec9c4be in _node_deserialize () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#2  0x00007fffeec9c524 in _node_deserialize () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#3  0x00007fffeec9c524 in _node_deserialize () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#4  0x00007fffeec9c524 in _node_deserialize () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#5  0x00007fffeec9c524 in _node_deserialize () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#6  0x00007fffeec9a78a in gen_node_start () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#7  0x00007fffeec9d106 in subtree_trimming () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#8  0x00007fffeec9ad5c in afl_custom_trim () from /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
#9  0x000055555556a644 in trim_case_custom (mutator=0x5555555de9a0, in_buf=0x55555560cf60 "hex: Z", q=<optimized out>, 
    afl=0x7ffff7559010) at src/afl-fuzz-mutators.c:393
#10 trim_case (afl=0x7ffff7559010, q=0x555555607ee0, in_buf=0x55555560cf60 "hex: Z") at src/afl-fuzz-run.c:795
#11 0x0000555555589637 in fuzz_one_original (afl=0x7ffff7559010) at src/afl-fuzz-one.c:509
#12 0x000055555555fcd0 in fuzz_one (afl=<optimized out>) at src/afl-fuzz-one.c:5583
#13 main (argc=<optimized out>, argv_orig=<optimized out>, envp=<optimized out>) at src/afl-fuzz.c:2455

(gdb) run            
Starting program: /usr/local/bin/afl-fuzz -m 1000 -i ./seeds/ -o out ./test_message_parse
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so1".
[+] Loaded environment variable AFL_CUSTOM_MUTATOR_ONLY with value 1
[+] Loaded environment variable AFL_SKIP_CPUFREQ with value 1
[+] Loaded environment variable AFL_CUSTOM_MUTATOR_LIBRARY with value /home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so
[+] Loaded environment variable AFL_NO_AFFINITY with value 1 
afl-fuzz++4.01a based on afl by Michal Zalewski and a large online community  
[+] afl++ is maintained by Marc "van Hauser" Heuse, Heiko "hexcoder" Eißfeldt, Andrea Fioraldi and Dominik Maier
[+] afl++ is open source, get it at https://github.com/AFLplusplus/AFLplusplus      
[+] NOTE: This is v3.x which changes defaults and behaviours - see README.md
[+] No -M/-S set, autoconfiguring for "-S default"
[*] Getting to work...
[+] Using exponential power schedule (FAST)
[+] Enabled testcache with 50 MB
[+] Generating fuzz data with a a length of min=1 max=1048576    
[*] Checking core_pattern...                     
[+] You have 32 CPU cores and 8 runnable tasks (utilization: 25%).    
[+] Try parallel jobs - see /usr/local/share/doc/afl/parallel_fuzzing.md.      
[*] Setting up output directories...                                           
[+] Output directory exists but deemed OK to reuse.                            
[*] Deleting old session data...                                               
[+] Output dir cleanup successful.                                             
[!] WARNING: Not binding to a CPU core (AFL_NO_AFFINITY set).                  
[*] Loading custom mutator library from '/home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so'...                                
[*] optional symbol 'afl_custom_post_process' not found.                       
[*] optional symbol 'afl_custom_havoc_mutation' not found.                     
[*] optional symbol 'afl_custom_havoc_mutation_probability' not found.         
[*] Symbol 'afl_custom_describe' not found.                                    
[+] Custom mutator '/home/test/proj2/Grammar-Mutator/libgrammarmutator-test.so' installed successfully.                                
[*] Scanning './seeds/'...                                                     
[+] Loaded a total of 100 seeds.                                               
[*] Creating hard links for all input files...                                 
[*] Validating target binary...                                                
[+] Persistent mode binary detected.                                           
[*] Spinning up the fork server...                                             
[Detaching after fork from child process 3670243]                              
[+] All right - fork server is up.                                             
[*] Target map size: 65536                                                     
[*] No auto-generated dictionary tokens to reuse.                              
[*] Attempting dry run with 'id:000000,time:0,execs:0,orig:99'...              
[!] WARNING: instability detected during calibration                           
    len = 7, map size = 172, exec speed = 113 us                               
[!] WARNING: Instrumentation output varies across runs.                        
[*] Attempting dry run with 'id:000001,time:0,execs:0,orig:98'...              
    len = 7, map size = 172, exec speed = 26 us                                
[!] WARNING: No new instrumentation output, test case may be useless.          
[*] Attempting dry run with 'id:000002,time:0,execs:0,orig:97'...              
    len = 7, map size = 172, exec speed = 25 us                                
[!] WARNING: No new instrumentation output, test case may be useless.
[*] Attempting dry run with 'id:000099,time:0,execs:0,orig:0'...
    len = 7, map size = 172, exec speed = 25 us
[!] WARNING: No new instrumentation output, test case may be useless.
[+] All test cases processed.
[!] WARNING: Some test cases look useless. Consider using a smaller set.
[!] WARNING: You have lots of input files; try starting small.
[+] Here are some useful stats:

    Test case count : 1 favored, 1 variable, 98 ignored, 100 total
       Bitmap range : 172 to 172 bits (average: 172.00 bits)
        Exec timing : 26 to 113 us (average: 28 us)

[*] No -t option specified, so I'll use an exec timeout of 20 ms.
[+] All set and ready to roll!

Program received signal SIGSEGV, Segmentation fault.
__memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:384
384     ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file or directory.
(gdb)