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Chapter 8. Known issues

This part describes known issues in Red Hat Enterprise Linux 9.0.

8.1. Installer and image creation

The reboot --kexec and inst.kexec commands do not provide a predictable system state

Performing a RHEL installation with the reboot --kexec Kickstart command or the inst.kexec kernel boot parameters do not provide the same predictable system state as a full reboot. As a consequence, switching to the installed system without rebooting can produce unpredictable results.

Note that the kexec feature is deprecated and will be removed in a future release of Red Hat Enterprise Linux.


Local Media installation source is not detected when booting the installation from a USB that is created using a third party tool

When booting the RHEL installation from a USB that is created using a third party tool, the installer fails to detect the Local Media installation source (only Red Hat CDN is detected).

This issue occurs because the default boot option int.stage2= attempts to search for iso9660 image format. However, a third party tool might create an ISO image with a different format.

As a workaround, use either of the following solution:

  • When booting the installation, click the Tab key to edit the kernel command line, and change the boot option inst.stage2= to inst.repo=.
  • To create a bootable USB device on Windows, use Fedora Media Writer.
  • When using a third party tool like Rufus to create a bootable USB device, first regenerate the RHEL ISO image on a Linux system, and then use the third party tool to create a bootable USB device.

For more information on the steps involved in performing any of the specified workaround, see, Installation media is not auto detected during the installation of RHEL 8.3.


The auth and authconfig Kickstart commands require the AppStream repository

The authselect-compat package is required by the auth and authconfig Kickstart commands during installation. Without this package, the installation fails if auth or authconfig are used. However, by design, the authselect-compat package is only available in the AppStream repository.

To work around this problem, verify that the BaseOS and AppStream repositories are available to the installer or use the authselect Kickstart command during installation.


Unexpected SELinux policies on systems where Anaconda is running as an application

When Anaconda is running as an application on an already installed system (for example to perform another installation to an image file using the –image anaconda option), the system is not prohibited to modify the SELinux types and attributes during installation. As a consequence, certain elements of SELinux policy might change on the system where Anaconda is running. To work around this problem, do not run Anaconda on the production system and execute it in a temporary virtual machine. So that the SELinux policy on a production system is not modified. Running anaconda as part of the system installation process such as installing from boot.iso or dvd.iso is not affected by this issue.


The USB CD-ROM drive is not available as an installation source in Anaconda

Installation fails when the USB CD-ROM drive is the source for it and the Kickstart ignoredisk --only-use= command is specified. In this case, Anaconda cannot find and use this source disk.

To work around this problem, use the harddrive --partition=sdX --dir=/ command to install from USB CD-ROM drive. As a result, the installation does not fail.


Minimal RHEL installation no longer includes the s390utils-base package

In RHEL 8.4 and later, the s390utils-base package is split into an s390utils-core package and an auxiliary s390utils-base package. Consequently, setting the RHEL installation to minimal-environment installs only the necessary s390utils-core package and not the auxiliary s390utils-base package. To work around this problem, manually install the s390utils-base package after completing the RHEL installation or explicitly install s390utils-base using a kickstart file.


Hard drive partitioned installations with iso9660 filesystem fails

You cannot install RHEL on systems where the hard drive is partitioned with the iso9660 filesystem. This is due to the updated installation code that is set to ignore any hard disk containing a iso9660 file system partition. This happens even when RHEL is installed without using a DVD.

To workaround this problem, add the following script in the kickstart file to format the disc before the installation starts.

Note: Before performing the workaround, backup the data available on the disk. The wipefs command formats all the existing data from the disk.

wipefs -a /dev/sda

As a result, installations work as expected without any errors.


Anaconda fails to verify existence of an administrator user account

While installing RHEL using a graphical user interface, Anaconda fails to verify if the administrator account has been created. As a consequence, users might install a system without any administrator user account.

To work around this problem, ensure you configure an administrator user account or the root password is set and the root account is unlocked. As a result, users can perform administrative tasks on the installed system.


Anaconda fails to login iSCSI server using the no authentication method after unsuccessful CHAP authentication attempt

When you add iSCSI discs using CHAP authentication and the login attempt fails due to incorrect credentials, a relogin attempt to the discs with the no authentication method fails. To workaround this problem, close the current session and login using the no authentication method.


New XFS features prevent booting of PowerNV IBM POWER systems with firmware older than version 5.10

PowerNV IBM POWER systems use a Linux kernel for firmware, and use Petitboot as a replacement for GRUB. This results in the firmware kernel mounting /boot and Petitboot reading the GRUB config and booting RHEL.

The RHEL 9 kernel introduces bigtime=1 and inobtcount=1 features to the XFS filesystem, which kernels with firmware older than version 5.10 do not understand.

To work around this problem, you can use another filesystem for /boot, for example ext4.


Cannot install RHEL when PReP is not 4 or 8 MiB in size

The RHEL installer cannot install the boot loader if the PowerPC Reference Platform (PReP) partition is of a different size than 4 MiB or 8 MiB on a disk that uses 4 kiB sectors. As a consequence, you cannot install RHEL on the disk.

To work around the problem, make sure that the PReP partition is exactly 4 MiB or 8 MiB in size, and that the size is not rounded to another value. As a result, the installer can now install RHEL on the disk.


New XFS features prevent booting of PowerNV IBM POWER systems with firmware kernel older than version 5.10

PowerNV IBM POWER systems use a Linux kernel for firmware, and use Petitboot as a replacement for GRUB. This results in the firmware kernel mounting /boot and Petitboot reading the GRUB config and booting RHEL.

The RHEL 9 kernel introduces bigtime=1 and inobtcount=1 features to the XFS filesystem, which firmware with kernel older than version 5.10 do not understand. As a consequence, Anaconda prevents the installation with the following error message:

Your firmware doesn’t support XFS file system features on the /boot file system. The system will not be bootable. Please, upgrade the firmware or change the file system type.

As a workaround, use another filesystem for /boot, for example ext4.


8.2. Subscription management

virt-who cannot connect to ESX servers when in FIPS mode

When using the virt-who utility on a RHEL 9 system in FIPS mode, virt-who cannot connect to ESX servers. As a consequence, virt-who does not report any ESX servers, even if configured for them, and logs the following error message:

ValueError: [digital envelope routines] unsupported

To work around this issue, do one of the following:

  • Do not set the RHEL 9 system you use for running virt-who to FIPS mode.
  • Do not upgrade the RHEL system you use for running virt-who to version 9.0.


8.3. Software management

The Installation process sometimes becomes unresponsive

When you install RHEL, the installation process sometimes becomes unresponsive. The /tmp/packaging.log file displays the following message at the end:

10:20:56,416 DDEBUG dnf: RPM transaction over.

To workaround this problem, restart the installation process.


8.4. Shells and command-line tools

Renaming network interfaces using ifcfg files fails

On RHEL 9, the initscripts package is not installed by default. Consequently, renaming network interfaces using ifcfg files fails. To solve this problem, Red Hat recommends that you use udev rules or link files to rename interfaces. For further details, see Consistent network interface device naming and the man page.

If you cannot use one of the recommended solutions, install the initscripts package.


The chkconfig package is not installed by default in RHEL 9

The chkconfig package, which updates and queries runlevel information for system services, is not installed by default in RHEL 9.

To manage services, use the systemctl commands or install the chkconfig package manually.

For more information about systemd, see Introduction to systemd. For instructions on how to use the systemctl utility, see Managing system services with systemctl.


8.5. Infrastructure services

Both bind and unbound disable validation of SHA-1-based signatures

The bind and unbound components disable validation support of all RSA/SHA1 (algorithm number 5) and RSASHA1-NSEC3-SHA1 (algorithm number 7) signatures, and the SHA-1 usage for signatures is restricted in the DEFAULT system-wide cryptographic policy.

As a result, certain DNSSEC records signed with the SHA-1, RSA/SHA1, and RSASHA1-NSEC3-SHA1 digest algorithms fail to verify in Red Hat Enterprise Linux 9 and the affected domain names become vulnerable.

To work around this problem, upgrade to a different signature algorithm, such as RSA/SHA-256 or elliptic curve keys.

For more information and a list of top-level domains that are affected and vulnerable, see the DNSSEC records signed with RSASHA1 fail to verify solution.


named fails to start if the same writable zone file is used in multiple zones

BIND does not allow the same writable zone file in multiple zones. Consequently, if a configuration includes multiple zones which share a path to a file that can be modified by the named service, named fails to start. To work around this problem, use the in-view clause to share one zone between multiple views and make sure to use different paths for different zones. For example, include the view names in the path.

Note that writable zone files are typically used in zones with allowed dynamic updates, slave zones, or zones maintained by DNSSEC.


8.6. Security

OpenSSL does not detect if a PKCS #11 token supports the creation of raw RSA or RSA-PSS signatures

The TLS 1.3 protocol requires support for RSA-PSS signatures. If a PKCS #11 token does not support raw RSA or RSA-PSS signatures, server applications that use the OpenSSL library fail to work with an RSA key if the key is held by the PKCS #11 token. As a result, TLS communication fails in the described scenario.

To work around this problem, configure servers and clients to use TLS version 1.2 as the highest TLS protocol version available.


OpenSSL incorrectly handles PKCS #11 tokens that does not support raw RSA or RSA-PSS signatures

The OpenSSL library does not detect key-related capabilities of PKCS #11 tokens. Consequently, establishing a TLS connection fails when a signature is created with a token that does not support raw RSA or RSA-PSS signatures.

To work around the problem, add the following lines after the .include line at the end of the crypto_policy section in the /etc/pki/tls/openssl.cnf file:

SignatureAlgorithms = RSA+SHA256:RSA+SHA512:RSA+SHA384:ECDSA+SHA256:ECDSA+SHA512:ECDSA+SHA384
MaxProtocol = TLSv1.2

As a result, a TLS connection can be established in the described scenario.


Cryptography not approved by FIPS works in OpenSSL in FIPS mode

Cryptography that is not FIPS-approved works in the OpenSSL toolkit regardless of system settings. Consequently, you can use cryptographic algorithms and ciphers that should be disabled when the system is running in FIPS mode, for example:

  • TLS cipher suites using the RSA key exchange work.
  • RSA-based algorithms for public-key encryption and decryption work despite using the PKCS #1 and SSLv23 paddings or using keys shorter than 2048 bits.


PSK ciphersuites do not work with the FUTURE crypto policy

Pre-shared key (PSK) ciphersuites are not recognized as performing perfect forward secrecy (PFS) key exchange methods. As a consequence, the ECDHE-PSK and DHE-PSK ciphersuites do not work with OpenSSL configured to SECLEVEL=3, for example with the FUTURE crypto policy. As a workaround, you can set a less restrictive crypto policy or set a lower security level (SECLEVEL) for applications that use PSK ciphersuites.


GnuPG incorrectly allows using SHA-1 signatures even if disallowed by crypto-policies

The GNU Privacy Guard (GnuPG) cryptographic software can create and verify signatures that use the SHA-1 algorithm regardless of the settings defined by the system-wide cryptographic policies. Consequently, you can use SHA-1 for cryptographic purposes in the DEFAULT cryptographic policy, which is not consistent with the system-wide deprecation of this insecure algorithm for signatures.

To work around this problem, do not use GnuPG options that involve SHA-1. As a result, you will prevent GnuPG from lowering the default system security by using the non-secure SHA-1 signatures.


Some OpenSSH operations do not used FIPS-approved interfaces

The OpenSSL cryptographic library, which is used by OpenSSH, provides two interfaces: legacy and modern. Because of changes to OpenSSL internals, only the modern interfaces use FIPS-certified implementations of cryptographic algorithms. Because OpenSSH uses legacy interfaces for some operations, it does not comply with FIPS requirements.


gpg-agent does not work as an SSH agent in FIPS mode

The gpg-agent tool creates MD5 fingerprints when adding keys to the ssh-agent program even though FIPS mode disables the MD5 digest. Consequently, the ssh-add utility fails to add the keys to the authentication agent.

To work around the problem, create the ~/.gnupg/sshcontrol file without using the gpg-agent --daemon --enable-ssh-support command. For example, you can paste the output of the gpg --list-keys command in the <FINGERPRINT> 0 format to ~/.gnupg/sshcontrol. As a result, gpg-agent works as an SSH authentication agent.


SELinux staff_u users can incorrectly switch to unconfined_r

When the secure_mode boolean is enabled, staff_u users can incorrectly switch to the unconfined_r role. As a consequence, staff_u users can perform privileged operations affecting the security of the system.


Default SELinux policy allows unconfined executables to make their stack executable

The default state of the selinuxuser_execstack boolean in the SELinux policy is on, which means that unconfined executables can make their stack executable. Executables should not use this option, and it might indicate poorly coded executables or a possible attack. However, due to compatibility with other tools, packages, and third-party products, Red Hat cannot change the value of the boolean in the default policy. If your scenario does not depend on such compatibility aspects, you can turn the boolean off in your local policy by entering the command setsebool -P selinuxuser_execstack off.


SSH timeout rules in STIG profiles configure incorrect options

An update of OpenSSH affected the rules in the following Defense Information Systems Agency Security Technical Implementation Guide (DISA STIG) profiles:

  • DISA STIG for RHEL 9 (xccdf_org.ssgproject.content_profile_stig)
  • DISA STIG with GUI for RHEL 9 (xccdf_org.ssgproject.content_profile_stig_gui)

In each of these profiles, the following two rules are affected:

Title: Set SSH Client Alive Count Max to zero
CCE Identifier: CCE-90271-8
Rule ID: xccdf_org.ssgproject.content_rule_sshd_set_keepalive_0

Title: Set SSH Idle Timeout Interval
CCE Identifier: CCE-90811-1
Rule ID: xccdf_org.ssgproject.content_rule_sshd_set_idle_timeout

When applied to SSH servers, each of these rules configures an option (ClientAliveCountMax and ClientAliveInterval) that no longer behaves as previously. As a consequence, OpenSSH no longer disconnects idle SSH users when it reaches the timeout configured by these rules. As a workaround, these rules have been temporarily removed from the DISA STIG for RHEL 9 and DISA STIG with GUI for RHEL 9 profiles until a solution is developed.


fagenrules --load does not work correctly

The fapolicyd service does not correctly handle the signal hang up (SIGHUP). Consequently, fapolicyd terminates after receiving the SIGHUP signal. Therefore, the fagenrules --load command does not work properly, and rule updates require manual restarts of fapolicyd. To work around this problem, restart the fapolicyd service after any change in rules, and as a result fagenrules --load will work correctly.


8.7. Networking

An empty rd.znet option in the kernel command line causes the network configuration to fail

An rd.znet option without any arguments, such as net types or subchannels, in the kernel fails to configure networking. To work around this problem, either remove the rd.znet option from the command line completely or specify relevant net types, subchannels, and other relevant options. For more information about these options, see the dracut.cmdline(7) man page.


Failure to update the session key causes the connection to break

Kernel Transport Layer Security (kTLS) protocol does not support updating the session key, which is used by the symmetric cipher. Consequently, the user cannot update the key, which causes a connection break. To work around this problem, disable kTLS. As a result, with the workaround, it is possible to successfully update the session key.


The initscripts package is not installed by default

By default, the initscripts package is not installed. As a consequence, the ifup and ifdown utilities are not available. As an alternative, use the nmcli connection up and nmcli connection down commands to enable and disable connections. If the suggested alternative does not work for you, report the problem and install the NetworkManager-initscripts-updown package, which provides a NetworkManager solution for the ifup and ifdown utilities.


The primary IP address of an instance changes after starting the nm-cloud-setup service in Alibaba Cloud

After launching an instance in the Alibaba Cloud, the nm-cloud-setup service assigns the primary IP address to an instance. However, if you assign multiple secondary IP addresses to an instance and start the nm-cloud-setup service, the former primary IP address gets replaced by one of the already assigned secondary IP addresses. The returned list of metadata verifies the same. To work around the problem, configure secondary IP addresses manually to avoid that the primary IP address changes. As a result, an instance retains both IP addresses and the primary IP address does not change.


8.8. Kernel

kdump fails to start on RHEL 9 kernel

The RHEL 9 kernel does not have the crashkernel=auto parameter configured as default. Consequently, the kdump service fails to start by default.

To work around this problem, configure the crashkernel= option to the required value.

For example, to reserve 256 MB of memory using the grubby utility, enter the following command:

# grubby --args crashkernel=256M --update-kernel ALL

As a result, the RHEL 9 kernel starts kdump and uses the configured memory size value to dump the vmcore file.


The kdump mechanism fails to capture vmcore on LUKS-encrypted targets

When running kdump on systems with Linux Unified Key Setup (LUKS) encrypted partitions, systems require a certain amount of available memory. When the available memory is less than the required amount of memory, the systemd-cryptsetup service fails to mount the partition. Consequently, the second kernel fails to capture the crash dump file (vmcore) on LUKS-encrypted targets.

With the kdumpctl estimate command, you can query the Recommended crashkernel value, which is the recommended memory size required for kdump.

To work around this issue, use following steps to configure the required memory for kdump on LUKS encrypted targets:

  1. Print the estimate crashkernel value:

    # kdumpctl estimate
  2. Configure the amount of required memory by increasing the crashkernel value:

    # grubby --args=crashkernel=652M --update-kernel=ALL
  3. Reboot the system for changes to take effect.

    # reboot

As a result, kdump works correctly on systems with LUKS-encrypted partitions.


Allocating crash kernel memory fails at boot time

On certain Ampere Altra systems, allocating the crash kernel memory for kdump usage fails during boot when the available memory is below 1 GB. Consequently, the kdumpctl command fails to start the kdump service as the required memory is more than the available memory size.

As a workaround, decrease the value of the crashkernel parameter by a minimum of 240 MB to fit the size requirement, for example crashkernel=240M. As a result, the crash kernel memory allocation for kdump does not fail on Ampere Altra systems.


kTLS does not support offloading of TLS 1.3 to NICs

Kernel Transport Layer Security (kTLS) does not support offloading of TLS 1.3 to NICs. Consequently, software encryption is used with TLS 1.3 even when the NICs support TLS offload. To work around this problem, disable TLS 1.3 if offload is required. As a result, you can offload only TLS 1.2. When TLS 1.3 is in use, there is lower performance, since TLS 1.3 cannot be offloaded.


8.9. Boot loader

New kernels lose previous command-line options

The GRUB boot loader does not apply custom, previously configured kernel command-line options to new kernels. Consequently, when you upgrade the kernel package, the system behavior might change after reboot due to the missing options.

To work around the problem, manually add all custom kernel command-line options after each kernel upgrade. As a result, the kernel applies custom options as expected, until the next kernel upgrade.


8.10. File systems and storage

Device Mapper Multipath is not supported with NVMe/TCP

Using Device Mapper Multipath with the nvme-tcp driver can result in the Call Trace warnings and system instability. To work around this problem, NVMe/TCP users must enable native NVMe multipathing and not use the device-mapper-multipath tools with NVMe.

By default, Native NVMe multipathing is enabled in RHEL 9. For more information, see Enabling multipathing on NVMe devices.


The blk-availability systemd service deactivates complex device stacks

In systemd, the default block deactivation code does not always handle complex stacks of virtual block devices correctly. In some configurations, virtual devices might not be removed during the shutdown, which causes error messages to be logged. To work around this problem, deactivate complex block device stacks by executing the following command:

# systemctl enable --now blk-availability.service

As a result, complex virtual device stacks are correctly deactivated during shutdown and do not produce error messages.


Invalid sysfs value for supported_speeds

The qla2xxx driver reports 20Gb/s instead of the expected 64Gb/s as one of the supported port speeds in the sysfs supported_speeds attribute:

$ cat /sys/class/fc_host/host12/supported_speeds
16 Gbit, 32 Gbit, 20 Gbit

As a consequence, if the HBA supports 64Gb/s link speed, the sysfs supported_speeds value is incorrect. This affects only the supported_speeds value of sysfs and the port operates at the expected negotiated link rate.


Unable to connect to NVMe namespaces from Broadcom initiator on AMD EPYC systems

By default, the RHEL kernel enables the IOMMU on AMD-based platforms. Consequently, when you use IOMMU-enabled platforms on servers with AMD processors, you might experience NVMe I/O problems, such as I/Os failing due to transfer length mismatches.

To work around this problem, add the IOMMU in passthrough mode by using the kernel command-line option, iommu=pt. As a result, you can now connect to NVMe namespaces from Broadcom initiator on AMD EPYC systems.


8.11. Compilers and development tools

Certain symbol-based probes do not work in SystemTap on the 64-bit ARM architecture

Kernel configuration disables certain functionality needed for SystemTap. Consequently, some symbol-based probes do not work on the 64-bit ARM architecture. As a result, affected SystemTap scripts may not run or may not collect hits on desired probe points.

Note that this bug has been fixed for the remaining architectures with the release of the RHBA-2022:5259 advisory.


8.12. Identity Management

RHEL 9 Kerberos client fails to authenticate a user using PKINIT against Heimdal KDC

During the PKINIT authentication of an IdM user on a RHEL 9 Kerberos client, the Heimdal Kerberos Distribution Center (KDC) on RHEL 9 or earlier uses the SHA-1 backup signature algorithm because the Kerberos client does not support the supportedCMSTypes field. However, the SHA-1 algorithm has been deprecated in RHEL 9 and therefore the user authentication fails.

To work around this problem, enable support for the SHA-1 algorithm on your RHEL 9 clients with the following command:

# update-crypto-polices --set DEFAULT:SHA1

As a result, PKINIT authentication works between the Kerberos client and Heimdal KDC.

For more details about supported backup signature algorithms, see Kerberos Encryption Types Defined for CMS Algorithm Identifiers.

See also ] and xref:BZ-2077450[.


FIPS support for AD trust requires the AD-SUPPORT crypto sub-policy

Active Directory (AD) uses AES SHA-1 HMAC encryption types, which are not allowed in FIPS mode on RHEL 9 by default. If you want to use RHEL 9 IdM hosts with an AD trust, enable support for AES SHA-1 HMAC encryption types before installing IdM software.

Since FIPS compliance is a process that involves both technical and organizational agreements, consult your FIPS auditor before enabling the AD-SUPPORT sub-policy to allow technical measures to support AES SHA-1 HMAC encryption types, and then install RHEL IdM:

 # update-crypto-policies --set FIPS:AD-SUPPORT


Directory Server terminates unexpectedly when started in referral mode

Due to a bug, global referral mode does not work in Directory Server. If you start the ns-slapd process with the refer option as the dirsrv user, Directory Server ignores the port settings and terminates unexpectedly. Trying to run the process as the root user changes SELinux labels and prevents the service from starting in future in normal mode. There are no workarounds available.


Configuring a referral for a suffix fails in Directory Server

If you set a back-end referral in Directory Server, setting the state of the backend using the dsconf <instance_name> backend suffix set --state referral command fails with the following error:

Error: 103 - 9 - 53 - Server is unwilling to perform - [] - need to set nsslapd-referral before moving to referral state

As a consequence, configuring a referral for suffixes fail. To work around the problem:

  1. Set the nsslapd-referral parameter manually:

    # ldapmodify -D "cn=Directory Manager" -W -H ldap://
    dn: cn=dc\3Dexample\2Cdc\3Dcom,cn=mapping tree,cn=config
    changetype: modify
    add: nsslapd-referral
    nsslapd-referral: ldap://remote_server:389/dc=example,dc=com
  2. Set the back-end state:

    # dsconf <instance_name> backend suffix set --state referral

As a result, with the workaround, you can configure a referral for a suffix.


The dsconf utility has no option to create fix-up tasks for the entryUUID plug-in

The dsconf utility does not provide an option to create fix-up tasks for the entryUUID plug-in. As a result, administrators cannot not use dsconf to create a task to automatically add entryUUID attributes to existing entries. As a workaround, create a task manually:

# ldapadd -D "cn=Directory Manager" -W -H ldap:// -x

dn: cn=entryuuid_fixup___<time_stamp__,cn=entryuuid task,cn=tasks,cn=config
objectClass: top
objectClass: extensibleObject
basedn: __<fixup base tree>__
cn: entryuuid_fixup___<time_stamp>__
filter: __<filtered_entry>__

After the task has been created, Directory Server fixes entries with missing or invalid entryUUID attributes.


8.13. Desktop

Firefox add-ons are disabled after upgrading to RHEL 9

If you upgrade from RHEL 8 to RHEL 9, all add-ons that you previously enabled in Firefox are disabled.

To work around the problem, manually reinstall or update the add-ons. As a result, the add-ons are enabled as expected.


VNC is not running after upgrading to RHEL 9

After upgrading from RHEL 8 to RHEL 9, the VNC server fails to start, even if it was previously enabled.

To work around the problem, manually enable the vncserver service after the system upgrade:

# systemctl enable --now vncserver@:port-number

As a result, VNC is now enabled and starts after every system boot as expected.


8.14. Graphics infrastructures

With legacy BIOS, a VGA display shows no output

Your display might show no graphical output if you use the following system configuration:

  • A display connected over the VGA controller
  • UEFI switched to legacy mode

As a consequence, you cannot use or install RHEL on this configuration.

To work around the problem, use the following procedure:

  1. Boot the system to the boot loader menu.
  2. Add the nomodeset option to the kernel command line.

As a result, RHEL boots and shows graphical output as expected, but the maximum resolution is limited.

(BZ#1960467) configuration utilities do not work under Wayland utilities for manipulating the screen do not work in the Wayland session. Notably, the xrandr utility does not work under Wayland due to its different approach to handling, resolutions, rotations, and layout.


Limitations of Wayland in VMs

The Wayland session has stability and performance problems inside guest virtual machines (VMs). Red Hat recommends to use the X11 session for virtual environments instead.


NVIDIA drivers might revert to

Under certain conditions, the proprietary NVIDIA drivers disable the Wayland display protocol and revert to the display server:

  • If the version of the NVIDIA driver is lower than 470.
  • If the system is a laptop that uses hybrid graphics.
  • If you have not enabled the required NVIDIA driver options.

Additionally, Wayland is enabled but the desktop session uses by default if the version of the NVIDIA driver is lower than 510.


Night Light is not available on Wayland with NVIDIA

When the proprietary NVIDIA drivers are enabled on your system, the Night Light feature of GNOME is not available in Wayland sessions. The NVIDIA drivers do not currently support Night Light.


8.15. The web console

Removing USB host devices using the web console does not work as expected

When you attach a USB device to a virtual machine (VM), the device number and bus number of the USB device might change after they are passed to the VM. As a consequence, using the web console to remove such devices fails due to the incorrect correlation of the device and bus numbers. To workaround this problem, remove the <hostdev> part of the USB device, from the VM’s XML configuration.


Attaching multiple host devices using the web console does not work

When you select multiple devices to attach to a virtual machine (VM) using the web console, only a single device is attached and the rest are ignored. To work around this problem, attach only one device at a time.


8.16. Virtualization

Installing a virtual machine over https in some cases fails

Currently, the virt-install utility fails when attempting to install a guest operating system from an ISO source over a https connection - for example using virt-install --cdrom https://example/path/to/image.iso. Instead of creating a virtual machine (VM), the described operation terminates unexpectedly with an internal error: process exited while connecting to monitor message.

To work around this problem, install qemu-kvm-block-curl on the host to enable https protocol support. Alternatively, use a different connection protocol or a different installation source.


The Milan VM CPU type is sometimes not available on AMD Milan systems

On certain AMD Milan systems, the Enhanced REP MOVSB (erms) and Fast Short REP MOVSB (fsrm) feature flags are disabled in the BIOS by default. Consequently, the 'Milan' CPU type might not be available on these systems. In addition, VM live migration between Milan hosts with different feature flag settings might fail. To work around these problems, manually turn on erms and fsrm in the BIOS of your host.


Network traffic performance in virtual machines might be reduced

In some cases, RHEL 9.0 guest virtual machines (VMs) have somewhat decreased performance when handling high levels of network traffic.


Disabling AVX causes VMs to become unbootable

On a host machine that uses a CPU with Advanced Vector Extensions (AVX) support, attempting to boot a VM with AVX explicitly disabled currently fails, and instead triggers a kernel panic in the VM.


Failover virtio NICs are not assigned an IP address on Windows virtual machines

Currently, when starting a Windows virtual machine (VM) with only a failover virtio NIC, the VM fails to assign an IP address to the NIC. Consequently, the NIC is unable to set up a network connection. Currently, there is no workaround.


A hostdev interface with failover settings cannot be hot-plugged after being hot-unplugged

After removing a hostdev network interface with failover configuration from a running virtual machine (VM), the interface currently cannot be re-attached to the same running VM.


Live post-copy migration of VMs with failover VFs fails

Currently, attempting to post-copy migrate a running virtual machine (VM) fails if the VM uses a device with the virtual function (VF) failover capability enabled. To work around the problem, use the standard migration type, rather than post-copy migration.

(BZ#1817965, BZ#1789206)

8.17. RHEL in cloud environments

SR-IOV performs suboptimally in ARM 64 RHEL 9 virtual machines on Azure

Currently, SR-IOV networking devices have significantly lower throughout and higher latency than expected in ARM 64 RHEL 9 virtual machines VMs running on a Microsoft Azure platform.


Mouse is not usable in RHEL 9 VMs on XenServer 7 with console proxy

When running a RHEL 9 virtual machine (VM) on a XenServer 7 platform with a console proxy, it is not possible to use the mouse in the VM’s GUI. To work around this problem, disable the Wayland compositor protocol in the VM as follows:

  1. Open the /etc/gdm/custom.conf file.
  2. Uncomment the WaylandEnable=false line.
  3. Save the file.

In addition, note that Red Hat does not support XenServer as a platform for running RHEL VMs, and discourages using XenServer with RHEL in production environments.


Cloning or restoring RHEL 9 virtual machines that use LVM on Nutanix AHV causes non-root partitions to disappear

When running a RHEL 9 guest operating system on a virtual machine (VM) hosted on the Nutanix AHV hypervisor, restoring the VM from a snapshot or cloning the VM currently causes non-root partitions in the VM to disappear if the guest is using Logical Volume Management (LVM). As a consequence, the following problems occur:

  • After restoring the VM from a snapshot, the VM cannot boot, and instead enters emergency mode.
  • A VM created by cloning cannot boot, and instead enters emergency mode.

To work around these problems, do the following in emergency mode of the VM:

  1. Remove the LVM system devices file: rm /etc/lvm/devices/system.devices
  2. Recreate LVM device settings: vgimportdevices -a
  3. Reboot the VM

This makes it possible for the cloned or restored VM to boot up correctly.


The SR-IOV functionality of a network adapter attached to a Hyper-V virtual machine might not work

Currently, when attaching a network adapter with single-root I/O virtualization (SR-IOV) enabled to a RHEL 9 virtual machine (VM) running on Microsoft Hyper-V hypervisor, the SR-IOV functionality in some cases does not work correctly.

To work around this problem, disable SR-IOV in the VM configuration, and then enable it again.

  1. In the Hyper-V Manager window, right-click the VM.
  2. In the contextual menu, navigate to Settings/Network Adapter/Hardware Acceleration.
  3. Uncheck Enable SR-IOV.
  4. Click Apply.
  5. Repeat steps 1 and 2 to navigate to the Enable SR-IOV option again.
  6. Check Enable SR-IOV.
  7. Click Apply.


Customizing RHEL 9 guests on ESXi sometimes causes networking problems

Currently, customizing a RHEL 9 guest operating system in the VMware ESXi hypervisor does not work correctly with NetworkManager key files. As a consequence, if the guest is using such a key file, it will have incorrect network settings, such as the IP address or the gateway.

For details and workaround instructions, see the VMware Knowledge Base.


8.18. Supportability

Timeout when running sos report on IBM Power Systems, Little Endian

When running the sos report command on IBM Power Systems, Little Endian with hundreds or thousands of CPUs, the processor plugin reaches its default timeout of 300 seconds when collecting huge content of the /sys/devices/system/cpu directory. As a workaround, increase the plugin’s timeout accordingly:

  • For one-time setting, run:
# sos report -k processor.timeout=1800
  • For a permanent change, edit the [plugin_options] section of the /etc/sos/sos.conf file:
# Specify any plugin options and their values here. These options take the form
# plugin_name.option_name = value
#rpm.rpmva = off
processor.timeout = 1800

The example value is set to 1800. The particular timeout value highly depends on a specific system. To set the plugin’s timeout appropriately, you can first estimate the time needed to collect the one plugin with no timeout by running the following command:

# time sos report -o processor -k processor.timeout=0 --batch --build


8.19. Containers

Container images signed with a Beta GPG key can not be pulled

Currently, when you try to pull RHEL 9 Beta container images, podman exits with the error message: Error: Source image rejected: None of the signatures were accepted. The images fail to be pulled due to current builds being configured to not trust the RHEL Beta GPG keys by default.

As a workaround, ensure that the Red Hat Beta GPG key is stored on your local system and update the existing trust scope with the podman image trust set command for the appropriate beta namespace.

If you do not have the Beta GPG key stored locally, you can pull it by running the following command:

sudo wget -O /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta

To add the Beta GPG key as trusted to your namespace, use one of the following commands:

$ sudo podman image trust set -f /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta


$ sudo podman image trust set -f /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta

Replace namespace with ubi9-beta or rhel9-beta.


Podman fails to pull a container "X509: certificate signed by unknown authority"

If you have your own internal registry signed by our own CA certificate, then you have to import the certificate onto your host machine. Otherwise, an error occurs:

x509: certificate signed by unknown authority

Import the CA certificates on your host:

# cd /etc/pki/ca-trust/source/anchors/
[anchors]# curl -O <your_certificate>.crt

[anchors]# update-ca-trust

Then you can pull container images from the internal registry.


Running systemd within an older container image does not work

Running systemd within an older container image, for example, centos:7, does not work:

$ podman run --rm -ti centos:7 /usr/lib/systemd/systemd
 Storing signatures
 Failed to mount cgroup at /sys/fs/cgroup/systemd: Operation not permitted
 [!!!!!!] Failed to mount API filesystems, freezing.

To work around this problem, use the following commands:

# mkdir /sys/fs/cgroup/systemd
# mount none -t cgroup -o none,name=systemd /sys/fs/cgroup/systemd
# podman run --runtime /usr/bin/crun --annotation=run.oci.systemd.force_cgroup_v1=/sys/fs/cgroup --rm -ti centos:7 /usr/lib/systemd/systemd


podman system connection add and podman image scp fails

Podman uses SHA-1 hashes for the RSA key exchange. The regular SSH connection among machines using RSA keys works, while the podman system connection add and podman image scp commands do not work using the same RSA keys, because the SHA-1 hashes are not accepted for key exchange on RHEL 9:

$ podman system connection add --identity ~/.ssh/id_rsa test_connection $REMOTE_SSH_MACHINE
Error: failed to connect: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

To work around this problem, use the ED25519 keys:

  1. Connect to the remote machine:

    $ ssh -i ~/.ssh/id_ed25519 $REMOTE_SSH_MACHINE
  2. Record ssh destination for the Podman service:

    $ podman system connection add --identity ~/.ssh/id_ed25519 test_connection $REMOTE_SSH_MACHINE
  3. Verify that the ssh destination was recorded:

    $ podman system connection list