I just came across this after upgrading to 16.2.6 from octopus on centos8-stream
None of my OSDs would start after the host had been rebooted post upgrade

In systemctl log

Error: container_linux.go:380: starting container process caused: 
process_linux.go:545: container init caused: rootfs_linux.go:76: mounting 
"/var/lib/ceph/d786756e-0b2e-11ec-ac53-f4ce46b6224c/selinux" to rootfs at 
"/sys/fs/selinux" caused: mkdir 
/var/lib/containers/storage/overlay/d208c960f34cd2493ec0e4ca947ae04acd2ab9ace6b5418f53daa12076e083d0/merged/sys/fs/selinux:
 operation not permitted: OCI permission denied

This was caused by SELINUX being disabled, setting to permissive or enforced 
fixes the issue and allows the OSDs to start.

I couldn't find any info about this online, so posting here in case anyone sees 
the same issue.

Thanks


Adam

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