On 11/06/2018 12:41 PM, Pat Riehecky wrote:
> Updated packages have been posted for testing:
> 
> https://urldefense.proofpoint.com/v2/url?u=ftp-3A__ftp.scientificlinux.org_linux_scientific_7rolling_testing_x86-5F64_&d=DwID-g&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbBYBgsCHS7vSr83lHQ-aa58eXICk1KkzZlAHgohLRRrX&m=oJ6vWa_-lurfZaPrj8HhUDh7SYKse7po0jdrTOGEGos&s=G4mlpgyw1vUEwr51XcvbIP1WtMz3CGmaqftTuqpPFqw&e=
> 
> Most of the SL7.6 security errata is now published in the sl-testing repo.
> 
> Additional packages will be added as the become available.
> 
> Currently there are over 1200 binary packages to test.
> 
> Unless a critical bug is reported these will be published to all SL7 
> releases on : November 26 2018
> 
> You can install this update for testing via the sl-testing repo on
> your SL system:
>    yum --enablerepo=sl-testing update <package you wish to test>

Looks like you're missing the selinux updates:

--> Running transaction check
---> Package kernel.x86_64 0:3.10.0-862.9.1.el7 will be erased
--> Processing Conflict: kernel-3.10.0-957.el7.x86_64 conflicts 
selinux-policy-targeted < 3.13.1-201
--> Finished Dependency Resolution
Error: kernel conflicts with 
selinux-policy-targeted-3.13.1-192.el7_5.6.noarch


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