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Hello Red Hat, there is a test BUG for your 7 products, the content is Chinese, please understand 问题复现: 首先 useradd ttt 创建一个账号 然后 su - ttt 进入账户 这里注意 直接 su 输入密码 进入管理员 (这里就会留下一个BASH的进程) 当 userdel -r ttt 时 就会报错 提示有进程正在使用 解决方案是 ps -ef |grep 报错的PID 查到PID 然后kill -9 PID 但是这样 内核就会崩溃 然后现在用的BASH也不好使了 就是输入不了命令 都是空格 想问下这个问题是什么原因造成的 还是是系统的BUG原理是什么 以下是演示截图: go to annex! PS:正常如果 su - ttt 然后 logout 然后再操作userdel -r ttt是没有问题的 第二次测试的时候 虚拟机 也死了 很恐怖 自己输入了exit 然后就没了~ bash 终端就被关闭了 再打开就可以了 annex: 1.20190723225059Thinkmail@377972706.png https://p13.zdusercontent.com/attachment/329667/yFzfdr4tjNBPN8iGY1rtpba8v?token=eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..HAhY_83QYbMuv5ld7Q8NWg.9UPrZS-J5aX7WOt20Ag_Ds2VMUp3pKe6V-AxbZgxX36oYPLObvNpU_ZY9hw1hd0iWwF4FrefeJwip_UlTklSAhH6ctocW3lSZpNyegppoIOgpw_1B4cNINey_mu_lGchknT-omAKFWU-5I_TPEtbo6Twp95R_I4ELAFSrD33uX4rnyjpU8qIQIJq7TKNM1fVcVqO0NoLZ8QjoPpfJcZHpv7Kcwmau0_t6xyJEb9xnPS5nzGY6y49RPONqTb0CFUMONdPxet_KJTBHwrddn1HSQ.BGOaJnqYycmcjFiTFO8tQg 2.20190723225059Thinkmail@377972835.png https://p13.zdusercontent.com/attachment/329667/bV3BFNHGfbQMTPVBKpIDzoEM9?token=eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..ZXz901xpqD8Pm9201JglJQ.MVJubF72ZvpDnGXsS1iPLSLjQlLeRIXnCkVlN7vQWyA3sl9FbWi1ZLOL_TbWzDi67t5LjDKap2a2x-ipJS0nsUVOBLog2D2x9L9DsEKqK73-3lwfipgFO7Cx9ZslCPsdosBBLtghbmE9B1P04Ex1dRkTKfyvyrAjYjJwVfUld95es3LWxKX_NUyEURfpSNzhNr9sqxkMgxhNGwunqUIaDkynW5d3NbcWNyqIXGR_3ORQaMvy79y7QLfy8GDGSUlNz7B4lw88cLs_wqexLRzYBw.pI7x3Ud4vMZD5IVJjIn07g 3.20190723225059Thinkmail@377973169.png https://p13.zdusercontent.com/attachment/329667/fn2EVMk474xqgGRwSHL7XboS4?token=eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..qeDGIHG-4Ldyp4vtL3mXcQ.rD463STa8zYXKXbDGyDcQ4Q-r9B7RwxBbHKm4wPibCGyw5YLq5pB6AGnc7uLFwu6BO6Fj3gBPMbbfgfMnt3fCUT1DkymlowkAYK47dJEFIyqog_qDW8FKHTH6CCwVCcbIKSiRsEL50UVPik5hm-X1LIZ_6x464AQQqOfrlaFqVvOB9O2blsFhWBDBVuiQdzROCoEUcZYDO7Y8Z5XkVSOMeJuowGSQ6RwIf5qnrCQNbLVnlUfWWgPj8JH2vkwQ1eE4933ZTbhrD4JHonn7qQbBQ.KlZZ4nkqGvv0eOPEdDWBmQ The attachment is the first time that the connection is automatically sent to the customer service via email. Problem recurrence: First useradd ttt create an account Then su - ttt enters the account Note here directly su Enter the password Enter the administrator (here will leave a BASH process) When userdel -r ttt will report an error, indicating that a process is in use. The solution is ps -ef |grep error PID found PID Then kill -9 PID But the kernel will crash, and the BASH that is used now is not good. It is impossible to enter the command. I want to ask what is the cause of this problem or what is the principle of the system BUG? The following is a demo screenshot: PS: Normal if su - ttt then logout and then operate userdel -r ttt is no problem The second test, the virtual machine is also dead, very scary, I entered the exit and then it is gone~ the bash terminal is closed, and then it can be opened.