Parameters that expect integer values:

$ ./john --test=2--format=sunmd5
Will run 8 OpenMP threads
Benchmarking: descrypt, traditional crypt(3) [DES 128/128 AVX-16]... (8xOMP) DONE
Many salts: 15040K c/s real, 1888K c/s virtual
Only one salt:  11911K c/s real, 1498K c/s virtual

Benchmarking: bsdicrypt, BSDI crypt(3) ("_J9..", 725 iterations) [DES 128/128 AVX-16]... (8xOMP) DONE
Many salts: 467968 c/s real, 58605 c/s virtual
Only one salt:  399410 c/s real, 50333 c/s virtual

Benchmarking: md5crypt, crypt(3) $1$ [MD5 128/128 AVX 4x3]... (8xOMP) DONE
Raw:    116736 c/s real, 14619 c/s virtual

Benchmarking: bcrypt ("$2a$05", 32 iterations) [Blowfish 32/64 X2]... (8xOMP) ^CWait...
Session aborted

Accidentally, I forgot a space between --test=2 and --format=sunmd5, and got what I didn't intend.

I can reproduce on master, will post this to john-dev as well:

$ ./john --test=1--format=md5crypt
Benchmarking: descrypt, traditional crypt(3) [DES 128/128 AVX-16]... DONE
Many salts: 4476K c/s real, 4476K c/s virtual
Only one salt:  4596K c/s real, 4596K c/s virtual

Benchmarking: bsdicrypt, BSDI crypt(3) ("_J9..", 725 iterations) [DES 128/128 AVX-16]... DONE
Many salts: 172160 c/s real, 172160 c/s virtual
Only one salt:  167808 c/s real, 167808 c/s virtual

Benchmarking: md5crypt [MD5 32/64 X2]... DONE
Raw:    13086 c/s real, 13086 c/s virtual

Benchmarking: bcrypt ("$2a$05", 32 iterations) [Blowfish 32/64 X2]... ^CWait...
Session aborted