Chapter 5 Known Issues

Table of Contents

This chapter describes the known issues for Oracle Linux 7.5.

Note that additional issues specific to the kernel that you are using might also be present. If you are using the default UEK R4U6 please see Unbreakable Enterprise Kernel: Release Notes for Unbreakable Enterprise Kernel Release 4 Update 6. If you are using an alternate UEK release or update, please refer to the appropriate release notes for this kernel version, at Unbreakable Enterprise Kernel Documentation

5.1 Installation and Upgrade Issues

The following issues that might be encountered during installation.

5.1.1 Installation on an iSCSI disk

When installing on an iSCSI disk, add either ip=ibft or rd.iscsi.ibft=1 to the boot command line and specify at least one MBR or GPT-formatted disk as an installation target. Otherwise, the installation fails with the error message No valid boot loader target device found. (Bug ID 22076589)

5.1.2 Installation on an HP 3PAR TPVV

If you have not applied a Thin Persistence license to an HP 3PAR storage array, installation fails to create a file system on a thin provisioned virtual volume (TPVV). This license is required to support the low-level SCSI UNMAP command for storage reclamation. If you do not have a suitable license, the workaround is to use a fully provisioned virtual volume (FPVV) instead of a TPVV. (Bug ID 22140852)

5.1.3 Installation on an Aura7 NVMe device

Installation fails if the target device is an Aura7 NVMe add in card with 2 block devices. Although the card has two independent NVMe controllers and devices, they are assigned identical WWIDs. The multipath device mapper maps the two block devices to the same WWID, resulting in a bogus multipath configuration that prevents installation.

To work around the issue, disable multipath at boot for the installation by using the installer boot argument nompath. After installation, blocklist the NVMe block devices for multipath configuration on the system by editing /etc/multipath.conf, or disable device mapper multipath altogether. See Oracle® Linux 7: Administrator's Guide for more information on configuring multipath. (Bug ID 27638939)

5.2 Package Conflicts

The following are known package conflicts for packages distributed by Oracle for Oracle Linux 7 through ULN or the Oracle Linux yum server.

5.2.1 rdma-core and infiniband-diags when installing oracle-ofed-release package

In this release, a conflict between the rdma-core and infiniband-diags packages exists.

The conflict occurs when installing the oracle-ofed-release package, as RPM detects the conflict and attempts to install rdma-core-* packages instead of RDMA, which results in additional errors related to dependencies.

To avoid the conflict, use the ‐‐exclude=rdma-core* yum option when performing an install or upgrade of the OFED packages and install the yum-plugin-priorities package from the ol7_optional_latest yum repository on the Oracle Linux yum server. See Section 6.2, “Oracle-Supported OFED Packages” for more information. (Bug ID 26309256)

5.2.2 dovecot-devel.i686 and dovecot-devel.x86_64

The dovecot-devel.i686 and dovecot-devel.x86_64 packages in the ol7_x86_64_optional_latest ULN channel conflict. Attempting to install both packages results in a transaction check error: 

Transaction check error:
  file /usr/include/dovecot/config.h conflicts between attempted installs of
dovecot-devel-1:2.2.10-7.el7.i686 and dovecot-devel-1:2.2.10-7.el7.x86_64

There are bitsize differences between the identified file. You may only install one of these packages on the same system at once. (Bug ID 25057633)

5.2.3 ipa-server-dns.x86_64 and freeipa-server-dns

A conflict between the ipa-server-dns.x86_64 package and the freeipa-server-dns package in the ol7_x86_64_latest ULN channel exists in this release. The .x86_64 version of the ipa-server-dns package has been superseded by a .noarch package, starting with Oracle Linux 7.3.

To avoid the conflict, exclude the ipa-server-dns.*.x86_64 package in your yum configuration. See Oracle® Linux: Unbreakable Linux Network User's Guide for Oracle Linux 6 and Oracle Linux 7 more information about how to exclude packages. (Bug ID 25054687)

5.2.4 ipa-admintools.x86_64 and freeipa-admintools

There is a conflict between the ipa-admintools.x86_64 package and the freeipa-admintools package in the ol7_x86_64_latest ULN channel. The .x86_64 version of the ipa-admintools package has been superseded by a .noarch package, starting with Oracle Linux 7.3.

To avoid the conflict, you exclude the ipa-admintools.*.x86_64 package in your yum configuration. See Oracle® Linux: Unbreakable Linux Network User's Guide for Oracle Linux 6 and Oracle Linux 7 for more information about how to exclude packages. (Bug ID 25054687)

5.2.5 rear.x86_64 and rear.noarch

The .noarch version of the rear package in the ol7_x86_64_latest ULN channel has been superseded by a .x86_64 package, starting with Oracle Linux 7.3.

To avoid the conflict, exclude the rear.*.noarch package in your yum configuration. See Oracle® Linux: Unbreakable Linux Network User's Guide for Oracle Linux 6 and Oracle Linux 7 for more information abut how to exclude packages. (Bug ID 25054687)

5.2.6 PackageKit.i686 and PackageKit.x86_64

The PackageKit.i686 package from the ol7_x86_64_optional_latest ULN channel conflicts with the PackageKit.x86_64 package in the ol7_x86_64_u5_base channel. Attempting to install both packages results in a transaction check error: 

Transaction check error:
  file /usr/lib/python2.7/site-packages/packagekit/__init__.pyc from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/__init__.pyo from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/backend.pyc from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/backend.pyo from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/enums.pyc from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/enums.pyo from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/filter.pyc from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/filter.pyo from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/misc.pyc from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/misc.pyo from install of
PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/package.pyc from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/package.pyo from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/progress.pyc from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64
  file /usr/lib/python2.7/site-packages/packagekit/progress.pyo from install
of PackageKit-version.el7.i686 conflicts with file from package
PackageKit-version.el7.x86_64

You may only install one of these packages on the same system at once. To avoid the conflict, exclude the PackageKit.i686 package in your yum configuration. For more information about how to exclude packages, see Oracle® Linux: Unbreakable Linux Network User's Guide for Oracle Linux 6 and Oracle Linux 7.

(Bug ID 24963661)

5.2.7 sssd-common.i686 and sssd-common.x86_64

The sssd-common.i686 package conflicts with the sssd-common.x86_64 package in the ol7_x86_64_optional_base ULN channel. Attempting to install both packages results in a transaction check error similar to the following: 

Transaction check error:
  file /usr/share/systemtap/tapset/sssd.stp conflicts between attempted
installs of sssd-common-1.14.0-14.el7.i686 and
sssd-common-1.14.0-14.el7.x86_64

You may only install one of these packages on the same system at any given time. To avoid the conflict, exclude the sssd-common.i686 package in your yum configuration. See Oracle® Linux: Unbreakable Linux Network User's Guide for Oracle Linux 6 and Oracle Linux 7 for more information about how to exclude packages. (Bug ID 24963661)

5.3 File System Bugs

The following file systems related issues pertain to Oracle Linux 7.5.

5.3.1 btrfs: Send operation causes soft lockup on large deduped file

Using btrfs send on a large deduped file results in a soft lockup or out-of-memory issue. This problem occurs because the btrfs send operation cannot handle a large deduped file containing file extents that all point to one extent, as these types of file structures create tremendous pressure for the btrfs send operation.

To prevent this issue from occurring, do not use btrfs send on systems with less than 4 GB of memory. (Bug ID 25306023)

5.3.2 btrfs, ext4 and xfs: Kernel panic when freeze and unfreeze operations are performed in multiple threads

Freeze and unfreeze operations that are performed across multiple threads on any supported file system can cause the system to hang and the kernel to panic. This issue is the result of a race condition that occurs when the unfreeze operation is triggered before it is actually frozen. The resulting unlock operation attempts a write operation on a non-existent lock, which results in a kernel panic. (Bug ID 25321899)

5.3.3 btrfs: qgroup reserve space leaks

The way in which quota groups (qgroups) reserve space can result in issues with leaks. Some of these leaks are caused by rewriting to dirty ranges, resulting in a "pwrite64: Disk quota exceeded" error. (Bug ID 22483655)

5.3.4 btrfs: Incorrect exclusive reference count after cloning file between subvolumes

The count for exclusive references is incorrect after cloning a file between two subvolumes. This issue is related to quota groups and the way in which some code is implemented. (Bug ID 22456419)

5.3.5 btrfs: Kernel oops when unmounting during a quota rescan or disable

Operations that trigger a quota rescan or those that disable the quota on a mounted file system cause a kernel oops message when attempting to unmount the file system. This issue can cause the system to hang. (Bug ID 22377928)

5.3.6 btrfs: Kernel oops when removing shared extents using qgroup accounting

The removal of shared extents, where quota group (qgroup) accounting is used, can result in a kernel oops message. This issue occurs when inaccurate results are obtained during a back reference walk, due to missing records when adding delayed references. (Bug ID 21554517)

5.3.7 ext4: System hangs on unmount after an append to a file with negative i_size

While it is invalid for a file system to load an inode with a negative i_size, it is possible to create a file with a negative i_size and append to it. However, doing so causes an integer overflow in the routines underlying writeback, which results in the kernel locking up. (Bug ID 25565527)

5.3.8 ext4: hang occurs during dynamic expansion of inode size

A hang occurs with the ext4 file system during the dynamic expansion of an inode's size when using the inode's i_extra_size field. (Bug ID 25718971)

5.3.9 ext4: System hang when processing corrupted orphaned inode list

If the orphaned inode list is corrupted, the inode might be processed repeatedly, which results in a system hang. For example, if the orphaned inode list contains a reference to the bootloader inode, ext4_iget(), returns a bad inode, it results in a processing loop that can hang the system. (Bug ID 24433290)

5.3.10 xfs: Oracle Linux 7.4 and later incompatible with UEK R3 for file systems formatted using XFS with d_type enabled

All xfs file systems that are created by using the Oracle Linux 7.4 and later Oracle Linux 7 installers have d_type support enabled automatically. These files systems are formatted with the ftype=1 option. The UEK R3 kernel is incompatible with this option and therefore does not boot on systems that have been installed with the Oracle Linux 7.4 or a later version installer. This problem occurs when the default file system formatting is selected because the UEK R3 kernel cannot mount any xfs file system that is created by specifying ftype=1.

Note that upgrades are unaffected because previous updates of Oracle Linux 7 formatted disks use the ftype=0 option. However, when using UEK R3 on Oracle Linux 7.4 and later, be aware that you must explicitly set the ftype=0 option when formatting the disk with XFS.

When performing a kickstart installation, if you intend to use UEK R3 on the system, you can manually specify alternate file system options for formatting. If you want to continue to use XFS with UEK R3, you must explicitly set the formatting option to ftype=0 in your kickstart configuration. (Bug ID 26176688)

5.3.11 xfs: System hangs on unmount after a buffered append to a file with negative i_size

While it is invalid for a file system to load an inode with a negative i_size, it is possible to create a file in this manner. In the case where a buffer appends to the file, an integer overflow in the routines underlying writeback result in the kernel locking up. Note that a direct append does not cause this behavior. (Bug ID 25565490)

5.3.12 xfs: System hangs during xfs_fsr on two-extent files with speculative preallocation

During an xfs_fsr process on extents that are generated by speculative preallocation, the code that determines whether all of the extents fit inline miscalculates because the di_nextents call that is used does not account for these extents. This results in corruption of the in-memory inode, and ultimately the code attempts to move memory structures using incorrectly calculated ranges. This causes a kernel panic. (Bug ID 25333211)

5.4 Automatic Bug Reporting Tool

The automated reporting daemons and features provided by the Red Hat Automatic Bug Reporting Tool (ABRT) are not supported with Oracle Linux

ABRT packages and associated files, such as libreport, are included in the distribution to satisfy package dependencies and can be used to generate local bug reports but the features to automatically upload these reports are not supported. For technical assistance, contact Oracle Support by using the My Oracle Support portal or by telephone.

5.5 The libvirtd process displays a warning on startup

After upgrading from Oracle Linux 7.4, the libvirtd process displays a warning message during startup. The message is similar to: 

libvirtd ... warning : virQEMUCapsInit:1211 : Failed to get host CPU cache info 
libvirtd ... warning : virLXCDriverCapsInit:85 : Failed to get host CPU cache info

This warning does not occur with a fresh install. You can safely ignore this warning. (Bug ID 27700583)

5.6 Snapshots of KVM guests using UEFI fail and are unsupported

You cannot do snapshots of KVM guests if they use UEFI. In older versions of QEMU and libvirt, the tools may allow you to create the snapshot without an error or warning, but the snapshot could be corrupted. More recent versions of these tools prevent snapshot creation with an error. For example: 

virsh # snapshot-create-as OL7-seboot
error: Operation not supported: internal snapshots of a VM with pflash based
firmware are not supported

(Bug ID 26826800)

5.7 KVM guests with LSI MegaRAID SAS ISCSI controller limited to 7 virtual disks

An Oracle Linux 7 KVM guest using the LSI MegaRAID SAS ISCSI controller is limited to 7 virtual disks. Although KVM guests can have up to 8 ISCSI virtual disks, the LSI MegaRAID SAS controller uses the first slot for the ISCSI Initiator, leaving the 7 remaining slots for virtual disks.

The workaround for this issue is to use the megasas controller instead of the lsi controller when creating ISCSI virtual disks. For example, change -device lsi to -device megasas, as shown in highlighted text in the following example: 

# /usr/bin/qemu-system-x86_64 -machine accel=kvm -m 8192 -smp 8 \
-drive file=/path/OracleLinux-7.5-x86_64.qcow2,format=qcow2,if=none,id=disk \  
-device ide-hd,bus=ide.0,unit=0,drive=disk,bootindex=0 -device lsi,id=lsi0 \ 
-drive  file=/path/disk1.img,format=raw,if=none,id=drive_image1 \
-device scsi-hd,id=image1,drive=drive_image1,bus=lsi0.0 \
...
# /usr/bin/qemu-system-x86_64 -machine accel=kvm -m 8192 -smp 8 \
-drive file=/path/OracleLinux-7.5-x86_64.qcow2,format=qcow2,if=none,id=disk \  
-device ide-hd,bus=ide.0,unit=0,drive=disk,bootindex=0 -device megasas,id=lsi0 \ 
-drive  file=/path/disk1.img,format=raw,if=none,id=drive_image1 \
-device scsi-hd,id=image1,drive=drive_image1,bus=lsi0.0 \
...

(Bug 27681238)

5.8 crashkernel=auto setting on UEK R3

If you enable the crashkernel=auto kernel parameter for UEK R3 to simplify Kdump configuration, both dmesg output and /proc/cmdline show crashkernel=NNNM@0M. This behavior is expected for the implementation, where @0M implies the auto setting. The crashkernel=auto parameter is not supported for Xen. (Bug ID 17616874)

5.9 Running sosreport on UEFI systems results in grub2-plugin-errors.txt

Running the sosreport command on UEFI systems produces a grub2-plugin-errors.txt file with errors. This problem occurs because the sosreport command cannot locate the grub.cfg file, as UEFI systems do not use the same GRUB plug-in as BIOS systems.

This issue also happens on UEFI systems running the UEK release. (Bug ID 26586473)

5.10 grubby fatal error during kernel upgrade when /boot is on a btrfs subvolume

If /boot is hosted on a btrfs subvolume, GRUB 2 is unable to correctly process the initramfs and vmlinuz pathnames. This problem occurs when you update or install a new kernel and grubby attempts to update the GRUB 2 configuration. In the case where you are running a fresh installation of Oracle Linux 7.5, and you upgrade the RHCK or UEK kernel, the following error is displayed: 

grubby fatal error: unable to find a suitable template

When the system is rebooted after the kernel update, the system boots to the old kernel.

Similarly, when upgrading from Oracle Linux 7.4 to Oracle Linux 7.5, if /boot is hosted on a btrfs subvolume, the system boots to the old Oracle Linux 7.4 kernel after the upgrade is complete.

The workaround for this problem is to use grub2-mkconfig to regenerate the /etc/grub2/grub.cfg file immediately after the kernel has been installed or upgraded, for example: 

# grub2-mkconfig -o /boot/grub2/grub.cfg

Obtain a listing of the kernel menu entries in the generated configuration as follows: 

# grep -P "submenu|^menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2

From the listing, select the kernel entry that you want to run as the default kernel and set this entry as the default using the following command, substituting menu entry title with the title of the kernel entry that you identified in the listing: 

# grub2-set-default "menu entry title"

You can use the grub2-editenv list command to check that the saved_entry has been updated with the selected kernel menu title.

Reboot and use uname -a to check that the correct kernel is now running.

(Bug ID 22750169)

5.11 Hebrew LaTeX fonts

Installing the tex-fonts-hebrew package fails unless you first install all texlive* packages. (Bug ID 19059949)

5.12 InfiniBand Issues

The following are issues that you might encounter when using InfiniBand devices.

5.12.1 Kdump might fail due to an incorrect InfiniBand Adapter M3 Firmware version

Kdump might fail on Oracle Linux 7.5 if the Oracle Dual Port QDR InfiniBand Adapter M3 Firmware version 2.31.5350 is installed.

To prevent this issue from occurring, update the Oracle Dual Port QDR InfiniBand Adapter M3 Firmware version to at least 2.31.5350. (Bug ID 26351183)

5.12.2 Disabling an InfiniBand CA port generates warnings

You might see the following warning messages if you use the ibportstate disable command to disable an InfiniBand CA or router port: 

ibwarn: [2696] _do_madrpc: recv failed: Connection timed out
ibwarn: [2696] mad_rpc: _do_madrpc failed; dport (Lid 38)
ibportstate: iberror: failed: smp set portinfo failed

You can safely ignore these warnings. (Bug ID 16248314)

5.13 Intel QuickAssist Acceleration Technology

UEK R3 does not support the QAT driver that allows cryptographic capabilities to be offloaded to QuickAssist hardware.

5.14 Database installation and operation fails if RemoveIPC=yes is configured for systemd

If RemoveIPC=yes is configured for systemd, interprocess communication (IPC) is terminated for a non-system user's processes when that user logs out. This setting, which is intended for laptops, can cause software problems on server systems. For example, if the user is a database software owner such as oracle for Oracle Database, this configuration can cause database installation to fail or database services to crash.

By default, Oracle Linux 7.5 configures RemoveIPC=no in /etc/systemd/logind.conf to prevent systemd from terminating IPC. However, if you have touched this file before updating your system to Oracle Linux 7.5, the update installs the new version of the file as /etc/systemd/logind.conf.rpmnew and does not set RemoveIPC=no in /etc/systemd/logind.conf. To avoid database crashes, set RemoveIPC=no in /etc/systemd/logind.conf and run systemctl reboot to reboot the system. (Bug ID 22224874)

5.15 Unable to create Oracle Linux 7 LXC containers on NFS

The creation of Oracle Linux 7 containers fails when the root file system (/container) is hosted on an NFS share. The problem occurs because the iputils package in Oracle Linux 7 releases, (Updates 4 and 5) is built to use the Linux file extended attributes [xattr(7)] security capabilities(7). The NFS protocol does not support these file capabilities, so the iputils package might not be installed into an NFS files system. For example, when attempting to create an Oracle Linux 7.4 container, the installation fails while installing the iputils package, producing the following error: 

Error unpacking rpm package iputils-20121221-7.el7.x86_64
error: unpacking of archive failed on file /usr/bin/ping: cpio: cap_set_file
error: iputils-20121221-7.el7.x86_64: install failed

Similar issues are seen when attempting to install the initscripts and systemd packages while creating an Oracle Linux 7.3 container.

This issue occurs on both NFSv3 and NFSv4.

Oracle Linux 6 containers are not affected. (Bug ID 25024258)

5.16 Support for Oracle Linux 7 guests on Oracle VM and Xen

Oracle Linux 7 guests are supported for both hardware virtualization (HVM) and hardware virtualization with paravirtual drivers (PVHVM) on Oracle VM Release 3. Oracle Linux 7 guests in a paravirtualized domain (PVM) on Oracle VM or other Xen-based hypervisors are not supported.

Oracle Linux 7 guests of any type are not supported on Oracle VM Release 2. (Bug IDs 18712168, 18667813, 18266964)

5.17 Kdump to ssh target failed with Oracle Linux 7 PVHVM guest

If Kdump is set to an ssh target on an Oracle Linux 7.5 PVHVM guest, running on Oracle VM Release 3.4.4, Kdump fails to connect to the guest operating system. This issue is caused by the kdump service failing to start on the Oracle Linux 7.5 guest operating system.

To workaround this issue, on the guest virtual machine, manually start the kdump service after the operating system boots up using: 

# kdumpctl start

(Bug ID 27654392)

5.18 Hyper-V related services fail to start on Oracle Linux 7 guest with UEK R4 kernel under Windows Hyper-V Server

If you are running UEK R4 or an earlier release on Oracle Linux 7, the hypervkvpd and hypervvssd services fail to start if the Hyper-V packages are at version 0-0.29.20160216git.el7 or later.

To avoid this issue, upgrade to UEK R4U5 or later.

(Bug ID 24745861)

5.19 Geneve network driver support not available in UEK releases

The ip and iproute commands included with Oracle Linux 7.5 include support for Geneve-capable devices. The module for this driver is included with the RHCK but is not included in UEK R4. The commands to set, add or view Geneve devices are only functional when used with the RHCK. (Bug ID 24652835) .

5.20 net_prio control group not supported on UEK R3

The Network Priority cgroup subsystem (net_prio) is not currently supported for use with UEK R3. Attempting to use the module with UEK R3 results in error messages such as the following: 

modprobe: FATAL: Module netprio_cgroup not found
mount: special device cgroup does not exist.

(Bug ID 18966564)

5.21 NetworkManager fails to set the default gateway and route for interfaces configured with DHCP on UEK R3

When running UEK R3 on Oracle Linux 7.4 and later, NetworkManager fails to set the default gateway and route for network interfaces that are configured with DHCP. This can result in network interfaces not behaving correctly.

The workaround for this issue is to disable NetworkManager control over interfaces that are configured for DHCP.

To disable NetworkManager for an interface, edit the network script for the interface in /etc/sysconfig/network-scripts/ifcfg-dev and add the parameter NM_CONTROLLED=no, as shown in the following example: 

# echo "NM_CONTROLLED=no" >> /etc/sysconfig/network-scripts/ifcfg-eno4

(Bug ID 26268996)

5.22 NetworkManager fails to respond to IPv6 addresses on low priority networks with DHCP on UEK R4

When running UEK R4 on Oracle Linux 7.5, NetworkManager fails to send a response to low priority networks with DHCP on UEK R4. Networks with higher priority (link-local, IPv6 fe80:/64 routes) take priority over the low priority networks. This behavior might result in the DHCPv6 server failing to send a response to a DHCP client on a lower priority network, even if the network has another output device. (Bug ID 27714775)

5.23 NetworkManager unable to add IPv6 addresses to interfaces on UEK R3

After upgrading to Oracle Linux 7.5, or when running UEK R3 on Oracle Linux 7.4 and later releases, network interfaces that are configured for IPv6 might not be brought up by NetworkManager.

Messages similar to the following appear in the system log: 

<warn> platform-linux: do-add-ip6-address[2: fe80::210:e0ff:fe5f:920c]:
        failure 22 (Invalid argument)
<warn> platform-linux: do-add-ip6-address[5: fd00:1:1:24::456]:
        failure 22 (Invalid argument)

It is possible to manually add the IPv6 address to the interface by using the ip addr add command.

This issue is apparent, irrespective of whether IPv6 is configured statically, assigned dynamically through DHCP, or configured by using Stateless Address Autoconfiguration (SLAAC).

The workaround for this issue is to disable NetworkManager for interfaces where IPv6 must be configured for an interface. To disable NetworkManager for an interface, edit the network script for the interface in /etc/sysconfig/network-scripts/ifcfg-dev and add the parameter NM_CONTROLLED=no, as shown in the following example: 

# echo "NM_CONTROLLED=no" >> /etc/sysconfig/network-scripts/ifcfg-eno4

(Bug ID 24848072)

5.24 Network connection icon reports incorrect state for interfaces

The network connection icon might report an active network interface as being disconnected. This behavior is seen for the root user but not for other users. Command-line utilities such as ip link and ifconfig report the correct state. (Bug ID 19060089)

5.25 Power button defaults to ACPI Suspend

By default, Oracle Linux 7 in graphical (GUI) console mode treats the hardware power button as equivalent to the ACPI "Sleep" button, which puts the system into low-power sleep mode. This behavior is specific to GNOME desktop environment.

In previous Oracle Linux versions, the hardware power button initiated a system shutdown. To make Oracle Linux 7 do the same, create a file named /etc/dconf/db/local.d/01-shutdown-button with the following content: 

[org/gnome/settings-daemon/plugins/power]
button-power='shutdown'

Then run the following command: 

# dconf update

You must log out of the desktop environment and log back in for the new setting to take effect. (Bug ID 25597898)

5.26 Cockpit web interface fails to display subscription status

The Cockpit web interface might fail to display a subscription status when you click the Subscriptions menu option. An error similar to the following is returned: 

Couldn't get system subscription status. Please ensure subscription-manager
is installed.

There is no subscription-manager package available. (Bug ID 26581257)

5.27 32-bit RDMA packages are installed when upgrading a system with rdma-core installed

When upgrading from a system prior to Oracle Linux 7.4, where the rdma-core.noarch package is installed, 32-bit versions of the packages and many dependencies are also installed, unnecessarily. This is because the original version of the package is obsoleted and during upgrade the package is replaced with both the rdma-core.i686 and rdma-core.x86_64 versions of the package, along with those packages' dependencies.

To work around the issue, run the yum update command with the --exclude=\*.i686 option: 

# yum update --exclude=\*.i686

(Bug ID 28217831)

5.28 Uninstalling libpcap can result in the removal of a large number of libvirt packages

The libpcap package is updated to enable functionality for future technologies. If you install this package and then attempt to uninstall it, a large number of libvirt packages may also be uninstalled due to dependency relationships. The libvirt package has a dependency on the libvirt-daemon-driver-nwfiler package and this package has a dependency on libpcap. Removing libpcap removes the entire libvirt family of packages. (Bug ID 28582266)

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