Server Stuck at Booting with Timed out waiting for device

Applies to

RedHat 8.4 and later

Symptoms

The server connects to the storage system using a Fibre Channel card and has more than 35 LUNs.
However, after the restart, booting fails with below error and enter emergency mode:

Starting Switch Root...
[ TIME ] Timed out waiting for device dev-mapper-rhel\x2dhome.device.
[DEPEND] Dependency failed for /home.
[DEPEND] Dependency failed for Local File Systems.
[DEPEND] Dependency failed for Mark the need to relabel after reboot.

Check /var/log/messages found many errors with below:

<Hostname> systemd-udevd[1496]: Failed to update device symlinks: Too many levels of symbolic links
<Hostname> systemd-udevd[1687]: Failed to update device symlinks: Too many levels of symbolic links

Cause

This is a known bug with lower version of systemd package.

~]# rpm -qa | grep systemd
systemd-239-45.0.1.el8.x86_64 Tue Feb 8 21:08:30 2022

Solution

Update the 'systemd' rpm version to 'systemd-239-51.0.1.el8_5.3' or the latest version available.

~]# yum update systemd-*
Or
~]# rpm -Uvh systemd-*

After 'systemd' is upgraded, a reboot is highly recommended.

Reference

・ Document 2848415.1.pdf |