VMware ESXi 8.0 (Broadcom)

NOT_IMPLEMENTED world.c on VMware ESXi, what causes it and how to fix

By Sai Kiran Pandrala · Last verified: 2026-05-31 · Source: community Q&A, official OS documentation, distro forums (Ubuntu Discourse, Fedora Discussion, Arch BBS, Reddit r/linux, ServerFault, Unix StackExchange)

At a glance

OS / Distro	VMware ESXi 8.0 (Broadcom)
Category	Operating Systems
Guide type	Procedure
Skill level	Intermediate to advanced
Time	15 - 60 minutes including verification

If you hit NOT_IMPLEMENTED world.c on VMware ESXi, what causes it and how to fix on VMware ESXi 8.0 (Broadcom) in production, the steps below are the path most sysadmins take in 2026. None of them require opening a vendor case unless you are running a paid enterprise distro.

What not_implemented world.c on vmware esxi, what causes it and how to fix actually involves on VMware ESXi 8.0 (Broadcom)

The NOT_IMPLEMENTED world.c error on VMware ESXi typically surfaces with the message "NOT_IMPLEMENTED bora/vmkernel/main/world.c:2307". The exact code or signature line is what you grep for in the distro forum, ServerFault, or Unix StackExchange, not the human-readable sentence next to it.

On VMware ESXi this most often comes from one of three causes: a configuration file or unit override that drifted, a missing package or kernel module, or a resource limit (disk, RAM, file handles, inodes). The fix path differs by which.

The rest of this page is the structured fix path. Start with diagnose, then remediation, then the automation options so you do not have to do this by hand the next time it surfaces. Verify and safety sections at the end are the discipline that keeps the fix from regressing in production.

Diagnose first, fix second

Confirm identity and privilege. Run id, sudo -l, getent passwd $USER, and on systems with SSSD run sssctl user-checks $USER. About one in five 'why does this not work' tickets are actually 'I am in the wrong account', 'my Kerberos ticket expired', or 'I am hitting a sudoers rule I did not know about'.

Diff against last known good. The last config change you made is the cause about three quarters of the time, even when the change should not have mattered. Use etckeeper log, snapper diff, ZFS snapshot diff, or your Git history on /etc to see the actual delta between the state when it worked and when it broke. The change you remember is rarely the only change that happened.

Check service journal for the calling unit. journalctl -u <service> --since today --no-pager shows the full unit timeline. Add -p err to filter to errors only. Use journalctl -u <service> -f in another terminal while you reproduce; the bug usually surfaces in the live log within seconds.

Solution-focused remediation path

If the issue points at packages, do not start by force-removing them. Run apt --fix-broken install on Debian family, dnf check + dnf distro-sync on RHEL family, zypper verify + zypper dup on openSUSE, pacman -Syu on Arch. Force-removing a held-back package is the fastest way to break apt or dnf so badly the next boot lands in single-user mode.

If networking is suspect, use the structured tools, not ping alone. ip addr + ip route + ss -tunlp + nmcli device show + resolvectl status cover layer 2-5 in five commands. mtr -rwc 50 <target> tells you where the packet loss starts. tcpdump -i any -nn 'port 53' answers the DNS question definitively in 10 seconds. NetworkManager logs to journalctl -u NetworkManager.

For boot issues, the right primitive is the rescue console. UEFI dropdown to the firmware setup, boot from the install ISO, mount the root filesystem, and chroot into it. Once chrooted you can reinstall the bootloader (grub-install + update-grub on Debian family, grub2-install + grub2-mkconfig on RHEL family, bootctl install for systemd-boot), regenerate initramfs (update-initramfs -u -k all, dracut --force --regenerate-all, mkinitcpio -P), and reset the root password (passwd).

Automate this fix so you do not do it twice

Codify the fix as a systemd timer or cron job for unattended remediation

For workflows that need to run unattended (clear a stuck cache, rotate logs, fail over a service, rebuild an index) a systemd timer or a cron job is the right place. Timers can fire on boot, on schedule, or after a dependency unit reaches an active state. systemctl list-timers shows the next-fire time for every active timer. For interactive helper workflows, a wrapper shell script in /usr/local/bin/ documented in MOTD or the team wiki keeps the institutional knowledge accessible.

Add a Prometheus alert or Zabbix trigger so you catch the next occurrence

The cheapest way to never see the same incident twice is a monitoring rule that watches for the symptom (a specific log line, a metric threshold, a service state) and fires into Slack, PagerDuty, or a webhook when it trips. For VMware ESXi 8.0 (Broadcom) the relevant signals come from journalctl filters fed to a log shipper, Prometheus exporters such as node_exporter or blackbox_exporter or a service-specific exporter, and structured log forwarders such as Fluent Bit, Vector, or syslog-ng. Set thresholds against observed normal range, not round numbers.

Add a manual-approval gate with sudo and auditd for risky fixes

For multi-step fixes that include a destructive action (drop a database, delete a snapshot, fail over a cluster, wipe a partition) gate the script behind sudo with an auditd rule that logs every invocation. The audit trail lives in /var/log/audit/audit.log with the invoking UID and GID and the exact command. For change management requiring a second-person sign-off, wrap the destructive step in a configuration-management approval gate such as Ansible Tower or AWX, Puppet Enterprise, or Salt Master ACL.

Common pitfalls and what to watch for

The most common pitfall when fixing this on VMware ESXi 8.0 (Broadcom) is treating it as a one-off rather than as a recurring class of incident. The same misconfiguration tends to happen again after a kernel upgrade, a major distro version bump, or a fleet rollout unless the fix is codified. Add an Ansible role, a Puppet manifest, a SaltStack state, or a Cloud-init drop-in that prevents the same misconfig from being reintroduced. Documentation alone does not survive team turnover.

Another common trap: confirming the fix on a single host and assuming the fleet is healthy. Loop your check across every node, container, and VM that could exhibit the same symptom. If you cannot enumerate the affected scope without a script, you do not yet understand the scope.

Verify the fix worked

Reproduce the original symptom path. If it still surfaces on any host, container, or VM in the fleet, you have not fixed it.
Watch for 24 to 48 hours. journalctl --since '24 hours ago' -u <service> -p err and Prometheus query history can mask issues with cached health for 6 to 12 hours, especially for slow-burn memory leaks and disk-fill regressions.
Run a smoke test under realistic load. Happy-path tests miss race conditions, file-descriptor leaks, and cgroup limits.
Capture the new state in a runbook so the next person on call does not have to rediscover this. Push it to Confluence or your team wiki, not into Slack.
If the fix involved a permission or security change, run a CIS Benchmark or DISA STIG audit one more time to confirm you did not open a separate hole while closing this one.

Safety, rollback, blast radius

Test in a non-production VM, container, or namespace if your environment supports it. The cost of one disposable VM is cheaper than one rollback meeting.
Export the existing config before changing it. Most VMware ESXi 8.0 (Broadcom) services support --print-defaults, systemctl show, or a documented config-dump command. Capture that to source control before you start.
Know your rollback path. Some VMware ESXi 8.0 (Broadcom) operations are one-way (irreversible filesystem upgrade like ext3 to ext4 inline, kernel ABI change, removal of an LVM physical volume). Confirm reversibility on the official OS documentation before you commit.
Be aware of cross-service impact. A change to PAM ripples to every service using it. A change to /etc/resolv.conf affects every name lookup. A change to systemd default.target affects every reboot.
Maintenance window discipline: if the change touches DNS, certificate rotation, kernel upgrade, or anything that emits TLS handshakes, line up a window with stakeholder notification, not a heroic mid-day swap.

FAQ

How long does not_implemented world.c on vmware esxi. what causes it and how to fix typically take on this OS?

For most VMware ESXi 8.0 (Broadcom) environments, 15 to 60 minutes including verification. Large fleet rollouts, anything touching kernel parameters or initramfs, or cross-data-centre replication can stretch to half a day because you have to wait for package mirrors, configuration management runs, and reboot windows to align.

Is there a rollback path?

Yes for most VMware ESXi 8.0 (Broadcom) changes. Back up the existing config to a versioned file first (etckeeper commit, cp file file.bak.$(date +%F), or a Btrfs/ZFS snapshot), then commit it before you change anything. A few operations are one-way (in-place filesystem conversion, partition table rewrite, kernel ABI bump). Check the distro release notes for the specific operation before you commit.

Will this affect dependent services?

Often yes. VMware ESXi 8.0 (Broadcom) services are usually consumed by other workloads (application servers, cron jobs, monitoring agents, container runtimes, log shippers). Use systemctl list-dependencies and lsof to enumerate consumers before changing a shared service or configuration file.

What if my distro version does not match these steps?

Distro defaults move between releases. The steps in this page reflect mainstream defaults as of 2026-05-31 but the underlying CLI calls do not change as fast. If a command differs on your version, fall back to man <command> on the host, or the upstream project documentation - those almost always still work.

Where do I get vendor support if I am still stuck?

If you have an Ubuntu Pro, Red Hat, SUSE, Oracle, or Canonical Support subscription, open a case with: the exact error string, the relevant journalctl excerpt, the output of sosreport (RHEL family) or supportconfig (SUSE), and your reproduction steps. The distro forum is the no-cost public alternative - search there first; 80 percent of common VMware ESXi 8.0 (Broadcom) issues already have a working answer marked as solved.

References

Official documentation for VMware ESXi 8.0 (Broadcom)
Distro forums and community Q&A (Ubuntu Discourse, Fedora Discussion, Arch BBS, openSUSE Forum, Reddit r/linux + distro subreddits, ServerFault, Unix StackExchange)
Vendor status pages and release-notes feeds
CIS Benchmarks and DISA STIG hardening guides for VMware ESXi 8.0 (Broadcom)

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