💬 Not Sure the problem

Here is my env in my Centos7

• Linux 3.10.0-1127.19.1.el7.x86_64 Please accept this documentation update #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
• geckodriver version:
  geckodriver 0.26.0 (e9783a644016 2019-10-10 13:38 +0000)
• Firefox version:
  Failed to open connection to "session" message bus: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  Running without a11y support!
  Mozilla Firefox 68.12.0esr

I only use headless mode, here is the simple code:
require 'selenium-webdriver'
=> true
2.4.1 :002 > Selenium::WebDriver::Firefox::Service.driver_path = "/var/han/legal/HLP_Test/GoCD/firefox_driver/geckodriver"
=> "/var/han/legal/HLP_Test/GoCD/firefox_driver/geckodriver"
2.4.1 :003 > options = Selenium::WebDriver::Firefox::Options.new(args: ['-headless'],log_level: :info)
=> #<Selenium::WebDriver::Firefox::Options:0x0000000289f998 @Args=#<Set: {"-headless"}>, @binary=nil, @Profile=nil, @log_level=:info, @prefs={}, @options={}>
=>2.4.1 :004 > driver = Selenium::WebDriver.for(:firefox,options:options), it will take a long time to start the browser, normally just a few seconds and it consumes 100 % CPU and up to 5 or 6 GB RAM given my machine is 8GB during the startup
2.4.1 :006 > driver.navigate.to("https://www.baidu.com") It failed at this step! it return nil or Net::ReadTimeout: Net::ReadTimeout
2.4.1 :006 > driver.navigate.to("https://www.baidu.com")
=> nil
2.4.1 :009 > $driver.navigate.to("https://www.baidu.com")
Net::ReadTimeout: Net::ReadTimeout
from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/protocol.rb:176:in rbuf_fill' from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/protocol.rb:154:in readuntil'
from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/protocol.rb:164:in readline' from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http/response.rb:40:in read_status_line'
from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http/response.rb:29:in read_new' from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http.rb:1446:in block in transport_request'
from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http.rb:1443:in catch' from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http.rb:1443:in transport_request'
from /home/centos/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/net/http.rb:1416:in request' from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/http/default.rb:129:in response_for'
from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/http/default.rb:82:in request' from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/http/common.rb:64:in call'
from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/bridge.rb:167:in execute' from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/w3c/bridge.rb:567:in execute'
from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/remote/w3c/bridge.rb:59:in get' from /home/centos/.rvm/gems/ruby-2.4.1/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/common/navigation.rb:32:in to'
from (irb):9
from /home/centos/.rvm/rubies/ruby-2.4.1/bin/irb:11:in `

'
but my network to this website is :
PING baidu.com (220.181.38.148) 56(84) bytes of data.
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=1 ttl=44 time=3.87 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=2 ttl=44 time=3.91 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=3 ttl=44 time=3.85 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=4 ttl=44 time=3.93 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=5 ttl=44 time=3.85 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=6 ttl=44 time=3.83 ms
I only user headless mode, when I switch to non-headless, it then will say:
Selenium::WebDriver::Error::UnknownError: invalid argument: can't kill an exited process

What's wrong here, could anyone take a second to analyze??