[centos7] Test{,Systemd}Freeze FAIL: unexpected error: unable to freeze

[kolyshkin]

Hmm, we are getting this a lot lately :-\

Last example is from https://github.com/opencontainers/runc/pull/2868/checks?check_run_id=2299195550

=== RUN   TestSystemdFreeze
    utils_test.go:86: exec_test.go:539: unexpected error: unable to freeze
        
--- FAIL: TestSystemdFreeze (1.17s)

[kolyshkin]

A few more past failures

• 8 days old: https://github.com/opencontainers/runc/runs/2272440180?check_suite_focus=true
• 11 days old: https://github.com/opencontainers/runc/runs/2254259869?check_suite_focus=true
• 12 days old: https://github.com/opencontainers/runc/runs/2252814238?check_suite_focus=true

[kolyshkin]

• 14 days old: https://github.com/opencontainers/runc/runs/2230249911?check_suite_focus=true
• 14 days old this one is without systemd: https://github.com/opencontainers/runc/runs/2228626065?check_suite_focus=true
• Mar 9: https://github.com/opencontainers/runc/runs/2073456610?check_suite_focus=true
• Mar 4: https://github.com/opencontainers/runc/runs/2034186723?check_suite_focus=true

this ^^^ seems to be the first one; no failures found before that (checked up to Jan 26).

[kolyshkin]

Might be a regression caused by either #2774 (merged Feb 1) #2791 (merged Feb 7). Not sure what to do with it though...

[kolyshkin]

Another one from May 2: https://github.com/opencontainers/runc/pull/2929/checks?check_run_id=2488750446

=== RUN   TestFreeze
    utils_test.go:86: exec_test.go:539: unexpected error: unable to freeze
        
--- FAIL: TestFreeze (0.62s)