Seeing this on GHA CI starting today

not ok 70 runc run --no-pivot must not expose bare /proc
# (in test file tests/integration/no_pivot.bats, line 20)
#   `[[ "$output" == *"mount: permission denied"* ]]' failed
# runc spec (status=0):
# 
# runc run --no-pivot test_no_pivot (status=1):
# unshare: write error: Operation not permitted

with no changes in the relevant code (e.g. in #3021)

Seeing the same on my machine (apparently for the first time).

This test that is now failing was originally added in PR #2654 and was picked by #2657.

I tried runc HEAD, v1.0.0 and v1.0.0-rc95, they all fail in the same way.

I suspect the reason is updated kernel. From the failed CI job logs I see

Virtual Environment
Environment: ubuntu-20.04
Version: 20210628.1
Included Software: https://github.com/actions/virtual-environments/blob/ubuntu20/20210628.1/images/linux/Ubuntu2004-README.md

and from that README I see

Linux kernel version: 5.8.0-1036-azure

Now, a non-failed job (from yesterday) has

Virtual Environment
Environment: ubuntu-20.04
Version: 20210614.1
Included Software: https://github.com/actions/virtual-environments/blob/ubuntu20/20210614.1/images/linux/Ubuntu2004-README.md

and the README says

Linux kernel version: 5.8.0-1033-azure