I have a script that does continuous installs using AGENT_E2E_TEST_SCENARIO=COMPACT_IPV4, just starting a new install after the previous one completes. What I'm seeing is that eventually I end up getting installation failures due to the container-images-available validation failure. What gets logged in wait-for bootstrap-complete is:

level=debug msg=Host master-0: New image status quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:0f6ddae72f6d730ca07a265691401571a8d8f7e62546f1bcda26c9a01628f4d6. result: failure. 

level=debug msg=Host master-0: validation 'container-images-available' that used to succeed is now failing
level=debug msg=Host master-0: updated status from preparing-for-installation to preparing-failed (Host failed to prepare for installation due to following failing validation(s): Failed to fetch container images needed for installation from quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:0f6ddae72f6d730ca07a265691401571a8d8f7e62546f1bcda26c9a01628f4d6. This may be due to a network hiccup. Retry to install again. If this problem persists, check your network settings to make sure you’re not blocked. ; Host couldn't synchronize with any NTP server)

Sometimes the image gets loaded onto the other masters OK and sometimes there are failures with more than one host. In either case the install stalls at this point.

When using a disconnected environment (MIRROR_IMAGES=true) I don't see this occurring.

Containers on host0
[core@master-0 ~]$ sudo podman ps
CONTAINER ID  IMAGE                                                                                                                   COMMAND               CREATED       STATUS           PORTS       NAMES
00a0eebb989c  localhost/podman-pause:4.2.0-1661537366                                                                                                       11 hours ago  Up 11 hours ago              cef65dd7f170-infra
5d0eced94979  quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:caa73897dcb9ff6bc00a4165f4170701f4bd41e36bfaf695c00461ec65a8d589  /bin/bash start_d...  11 hours ago  Up 11 hours ago              assisted-db
813bef526094  quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:caa73897dcb9ff6bc00a4165f4170701f4bd41e36bfaf695c00461ec65a8d589  /assisted-service     11 hours ago  Up 11 hours ago              service
edde1028a542  quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:e43558e28be8fbf6fe4529cf9f9beadbacbbba8c570ecf6cb81ae732ec01807f  next_step_runner ...  11 hours ago  Up 11 hours ago              next-step-runner

Some relevant logs from assisted-service for this container image:
time="2022-11-03T01:48:44Z" level=info msg="Submitting step <container-image-availability> id <container-image-availability-b72665b1> to infra_env <17c8b837-0130-4b8c-ad06-19bcd2a61dbf> host <df170326-772b-43b5-87ef-3dfff91ba1a9>  Arguments: <[{\"images\":[\"registry.ci.openshift.org/ocp/release:4.12.0-0.nightly-2022-10-25-210451\",\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:ca122ab3a82dfa15d72a05f448c48a7758a2c7b0ecbb39011235bcf0666fbc15\",\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:0f6ddae72f6d730ca07a265691401571a8d8f7e62546f1bcda26c9a01628f4d6\",\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:9e52a45b47cd9d70e7378811f4ba763fd43ec2580378822286c7115fbee6ef3a\"],\"timeout\":960}]>" func=github.com/openshift/assisted-service/internal/host/hostcommands.logSteps file="/src/internal/host/hostcommands/instruction_manager.go:285" go-id=841 host_id=df170326-772b-43b5-87ef-3dfff91ba1a9 infra_env_id=17c8b837-0130-4b8c-ad06-19bcd2a61dbf pkg=instructions request_id=47cc221f-4f47-4d0d-8278-c0f5af933567

time="2022-11-03T01:49:35Z" level=error msg="Received step reply <container-image-availability-9788cfa7> from infra-env <17c8b837-0130-4b8c-ad06-19bcd2a61dbf> host <845f1e3c-c286-4d2f-ba92-4c5cab953641> exit-code <2> stderr <> stdout <{\"images\":[

{\"name\":\"registry.ci.openshift.org/ocp/release:4.12.0-0.nightly-2022-10-25-210451\",\"result\":\"success\"}

,{\"download_rate\":159.65409925994226,\"name\":\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:ca122ab3a82dfa15d72a05f448c48a7758a2c7b0ecbb39011235bcf0666fbc15\",\"result\":\"success\",\"size_bytes\":523130669,\"time\":3.276650405},{\"name\":\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:0f6ddae72f6d730ca07a265691401571a8d8f7e62546f1bcda26c9a01628f4d6\",\"result\":\"failure\"},{\"download_rate\":278.8962416008878,\"name\":\"quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:9e52a45b47cd9d70e7378811f4ba763fd43ec2580378822286c7115fbee6ef3a\",\"result\":\"success\",\"size_bytes\":402688178,\"time\":1.443863767}]}>" func=github.com/openshift/assisted-service/internal/bminventory.logReplyReceived file="/src/internal/bminventory/inventory.go:3287" go-id=845 host_id=845f1e3c-c286-4d2f-ba92-4c5cab953641 infra_env_id=17c8b837-0130-4b8c-ad06-19bcd2a61dbf pkg=Inventory request_id=3a571ba6-5175-4bbe-b89a-20cdde30b884                         

time="2022-11-03T01:49:35Z" level=info msg="Adding new image status for quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:0f6ddae72f6d730ca07a265691401571a8d8f7e62546f1bcda26c9a01628f4d6 with status failure to host 845f1e3c-c286-4d2f-ba92-4c5cab953641" func="github.com/openshift/assisted-service/internal/host.(*Manager).UpdateImageStatus" file="/src/internal/host/host.go:805" pkg=host-state