YCM and vim-go both subprocess gopls as analysis backend respectively, but only one gopls intance is needed.

[rustyhu]

Use YCM with go support temporarily.
But vim-go has more features for go integrated development, it is preferable in the future.

[rustyhu]

Searched the vim-go manual, vim-go seems not to use gopls to do code flycheck, only to do auto-completion.

Adding vim-go option to disable gopls is one solution:
let g:go_gopls_enabled = 0