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Description of problem:
Podman throws an error "Error: container create failed: cannot specify gid= mount options for unmapped gid in rootless containers
: internal libpod error" when try to run podman image as non-root (rootless mode) 

Version-Release number of selected component (if applicable):
Podman: 1.3.2
Go: go1.10.3
OS/Arch: linux/amd64

How reproducible:
100%

Steps to Reproduce:
1. yum install -y podman
2. curl -o /etc/yum.repos.d/rhel7.6-rootless-preview.repo https://copr.fedorainfracloud.org/coprs/vbatts/shadow-utils-newxidmap/repo/epel-7/vbatts-shadow-utils-newxidmap-epel-7.repo
3. yum install -y shadow-utils46-newxidmap slirp4netns 
4. useradd randomuser
5. passwd randomuser
6. echo "randomuser:100000:65536" >> /etc/subuid
7. echo "randomuser:100000:65536" >> /etc/subgid
8. podman run --rm -it alpine sh

Actual results:
Error: container create failed: cannot specify gid= mount options for unmapped gid in rootless containers
: internal libpod error

Expected results:
/ # 

Additional info:
Tried on Scientific Linux 7.6 and CentOS 7

Closing the bug as rootless containers are not supported on 7.6

The issue is in the version of runc available on 7.6, it has a bug that prevents rootless containers for working (it lacks upstream patch cbcc85d311725031e5957385f3ad43acfc0b66f2).  You'd need an updated runc binary.

*** This bug has been marked as a duplicate of bug 1719452 ***