After the script “run_campaign.sh” is executed, the message "illegal instruction" is displayed

I followed the how-to guide to install in docker，but something wrong happend as fllow:
[GF] Automaton file passed:/root/grammars/ruby/source_automata.json
Final=6
Init=0
NumStates=20
[+] 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
[+] Power schedules from github.com/mboehme/aflfast
[+] Python Mutator and llvm_mode instrument file list from github.com/choller/afl
[+] MOpt Mutator from github.com/puppet-meteor/MOpt-AFL
[+] Loaded environment variable AFL_DISABLE_TRIM with value 1
[*] Getting to work...
[+] Using exploration-based constant power schedule (EXPLORE, default)
[+] You have 4 CPU cores and 1 runnable tasks (utilization: 25%).
[+] Try parallel jobs - see docs/parallel_fuzzing.md.
[*] Checking CPU core loadout...
[+] Found a free CPU core, try binding to #0.
[*] Checking core_pattern...
[!] WARNING: Could not check CPU scaling governor
[*] Setting up output directories...
[+] Output directory exists but deemed OK to reuse.
[*] Deleting old session data...
[+] Output dir cleanup successful.
[*] Loading custom mutator library from '/root/gramatron_src/afl-gf/custom_mutators/gramfuzz/gramfuzz-mutator.so'...
[*] optional symbol 'afl_custom_post_process' not found.
[*] optional symbol 'afl_custom_init_trim' not found.
[*] optional symbol 'afl_custom_trim' not found.
[*] optional symbol 'afl_custom_post_trim' not found.
[*] optional symbol 'afl_custom_havoc_mutation' not found.
[*] optional symbol 'afl_custom_havoc_mutation_probability' not found.
[+] Custom mutator '/root/gramatron_src/afl-gf/custom_mutators/gramfuzz/gramfuzz-mutator.so' installed successfully.

Read testcases executing[*] Scanning '/tmp/inputs'...
[+] No auto-generated dictionary tokens to reuse.
[*] Creating hard links for all input files...
[*] Validating target binary...
[*] Attempting dry run with 'id:000000,time:0,orig:001'...

Read length:288[*] Spinning up the fork server...
[+] All right - fork server is up.
[*] Target map size: 15680
./run_campaign.sh: line 34: 1607 Illegal instruction (core dumped) $FUZZ_MAIN -m none -a $AUTOMATON -i $INPUT_DIR -o $OUTPUT_DIR -- $RUNCMD

my host OS is
Linux ubun2004 5.4.0-92-generic #103-Ubuntu SMP Fri Nov 26 16:13:00 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Start at run_campaign.sh line 34 and reproduce the Docker how-to on the reported Ubuntu 20.04 x86_64 host. Inspect the dry run and fork-server stage around the illegal-instruction failure, then verify that the campaign proceeds without the crash; the issue is complete when the cause and a reproducible resolution are documented.

Written by the indexing model from the issue text.