操作系统具体版本，Oracle具体版本？
可以看看更详细的日志吗？

之前遇到过一次是RHEL 7.3，需要安装patch 25078431
刚查询了一下，这个报错也有其他情况，需要结合日志跟具体版本判断。

Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Linux x86-64
Description
Execution of root.sh while installing Grid Infrastructure on RedHat Linux or Oracle Linux with RedHat Compatible Kernel (RHCK) 7 fails with the following error:
CLSRSC-400: A system reboot is required to continue installing.
This applies to both clustered and standalone Grid Infrastructure installations.
Occurrence
This will affect all new installations of Grid Infrastructure 12.2.0.1 on RedHat Linux or Oracle Linux with RedHat Compatible Kernel (RHCK) 7
Symptoms
While executing root.sh, the script will fail with the following message:
CLSRSC-400: A system reboot is required to continue installing.
Workaround
 A) If Grid Infrastructure installation has not yet commenced:
Apply the interim patch 25078431 using the below procedure.
1. Unzip Grid Infrastructure Gold Image on local node as 'grid' user
2. Apply the patch by running:
/gridSetup.sh -applyOneOffs patch location
An example is:
$ ./gridSetup.sh -applyOneOffs /u01/patch/25078431/
Preparing the home to patch...
Applying the patch /u01/patch/25078431/...
Successfully applied the patch.
(Any warnings about X11 that are displayed may safely be ignored)
3. Follow the normal install process, including running gridSetup.sh. Upon completion of the installation process, 'opatch lspatches' should show the patch is applied:
$ ./opatch lspatches
25078431;ACFS Interim patch for 25078431
OPatch succeeded.
B) If the Installation of Grid Infrastructure has failed during the execution of root.sh:
While it is possible to continue from a failed root.sh execution after performing manual steps for patching, the steps can be error prone and complex so we recommend the process outlined below:
1.  Clean up the partially installed Grid Infrastructure Home. Refer to the document:  How to Deinstall Oracle Clusterware Home Manually Document 1364419.1 for the steps
2.  Apply the patch as outlined in section A) here above and continue with the install process
Patches
 Interim patch 25078431 is required before installing 12.2 GI on Linux 7.3 (RedHat and OL7 with RHCK).
History
07-July-2017 Creation of Document
14-July-2017 Updated reasoning on point (B) and link for the clean up document
14-July-2017 Published External

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感谢指导