Oracle Linux 5.8 Release Notes

Updated February 2012


This document covers the following topics regarding Oracle Linux 5.8.

For the latest updates please refer to the online version of these release notes available at:

NOTE: An upgrade of Oracle Linux from a beta release is not supported. Further, an in-place upgrade between major versions of Oracle Linux is not supported. Oracle does not recommend an upgrade from earlier major versions of Oracle Linux even though anaconda provides an option to do this upgrade. A fresh installation is strongly recommended rather than a system upgrade between major versions.

Changes from the Upstream Release

The following RPMs are modified from the upstream release. All changes are trademark and look/feel related unless otherwise noted below under the specific RPM.

The following packages have been removed

The following documentation packages have been removed

New Packages added in this release

The following packages were added upstream for this release (5.8) which were not in the previous update release (5.7)

Packages added by Oracle

The following packages have been added to the release

Kernel and Driver Updates

Oracle Linux 5.8 ships with the following kernel packages

Note:Oracle Linux 5.8 includes both a 32 bit and a 64 bit Unbreakable Enterprise Kernel. Both Unbreakable Enterprise kernel and Red Hat compatible kernel are installed and the system boots with Unbreakable Enterprise kernel by default. If needed /etc/grub.conf can be modifed to make the system boot with Red Hat compatible kernel by default.

Red Hat Compatible Kernel

This section covers significant changes in the Red Hat compatible kernel in this release.

Driver Updates from the upstream distribution provider

Storage Network

Red Hat Compatible Kernel with Bug Fixes by Oracle

This is the Red Hat compatible kernel with critical bug fixes produced by Oracle.

Bug Fixes


The Red Hat Compatible Kernel with Bug Fixes by Oracle must be manually installed. To install this kernel, follow these steps:

  1. Mount Oracle Linux 5.8 DVD
  2. Copy the rpms from mount_point/Server/oracle_updated to your system
  3. Install required kernel using the rpm command, e.g.
    # rpm -ihv kernel-2.6.18-308.

Unbreakable Enterprise Kernel


The Unbreakable Enterprise Kernel is based on the upstream kernel 2.6.32-41 stable source tree with additional performance improvements, including:

Driver Updates since Oracle Linux 5 Update 7

Network Drivers updates

Storage Drivers updates



Technology Preview Features

The following Technology Preview features are currently not supported under Oracle Linux 5 and may not be functionally complete.

These features are not suitable for production use. However, these features are included to provide the feature with wider exposure.

Known Issues

  1. No networking after upgrading an Oracle Linux 5 HVM guest on Oracle VM 2.2.2
  2. Upgrading an existing Oracle Linux 5 Update 6 or Update 7 guest which is running in HVM mode on Oracle VM 2.2.2 may result in the network interface(s) being disabled after the reboot post-upgrade. To resolve this issue, ensure that the network interfaces are set to "paravirtual" in Oracle VM Manager.

    Alternatively, to maintain the emulated devices inside the guest, add xen_emul_unplug=never to the kernel boot line in /boot/grub/grub.conf and reboot the guest.

  3. No networking after upgrading an Oracle Linux 5 HVM with PV Drivers guest on Oracle VM 2.2.2 or 3.0
  4. Upgrading an existing Oracle Linux 5 Update 6 or Update 7 guest which is running in HVM with PV Drivers mode on Oracle VM 2.2.2 or 3.0 may result in the network interface(s) being disabled after the reboot post-upgrade. To resolve this issue, rename the /etc/sysconfig/network-scripts/ifcfg-eth0.bak file to /etc/sysconfig/network-scripts/ifcfg-eth0 and reboot the guest.
  5. Warnings appear in dmesg on first boot
  6. After an initial install of Oracle Linux 5.8, the following warning may appear one or more times in the output of dmesg:
    warning: process `firstboot' used the deprecated sysctl system call with 1.23. 
    This warning can be safely ignored.
  7. New multipath settings requires changes to /etc/multipath.conf
  8. Oracle Linux 5.8 includes a new version of device-mapper-multipath. This new version requires manual changes to the /etc/multipath.conf file. In the multipath.conf, the line with prio_callout needs to be replaced by the keyword prio, and a simple string, not an executable pathname, used for the parameter to prio. Valid settings for prio are:
  9. Multipath failure causes flush of all multipath devices
  10. In some multipath failure cases, the multipath maps can get flushed when all paths fail, and multipath -l displays no information on the status of your multipath devices. This has been reported with 2.6.32 UEK kernels using NetApp LUNs, but not when running 2.6.18 series kernels with the same storage LUNs.
  11. Error inserting cxgb3i module (13493043)
  12. iscsi offload via cxgb3i on a server with Chelsio T3 Network Controller will fail with following error if ofa kernel package is installed
    fatal: error inserting cxgb3i - unknown symbol t3_l2e_free
    Use following workaround steps to fix the issue:
  13. Slow performance on 10Gb Ethernet Interfaces
  14. The default networking tuning parameters may be too low for some 10Gb Ethernet interface drivers. If you are experiencing less than expected network performance, change the following NIC parameters: To:
  15. dbus-daemon warning in dmesg on 32-bit systems
  16. On 32-bit Oracle Linux systems, you may see the following warning in dmesg:
    warning: `dbus-daemon' uses 32-bit capabilities (legacy support in use)
    This is only a warning and can be safely ignored.
  17. iTCO_wdt warning in dmesg
  18. Some server hardware may not support the Intel TCO watchdog drivers. The following warning may be seen in dmesg:
    iTCO_vendor_support: vendor-support=0 
    iTCO_wdt: Intel TCO WatchDog Timer Driver v1.05 
    iTCO_wdt: failed to reset NO_REBOOT flag, reboot disabled by hardware 
    iTCO_wdt: No card detected 
    intel_rng: FWH not detected
    To disable this TCO WatchDog Timer Driver and suppress this warning at boot time add the line "blacklist iTCO_wdt" to /etc/modprobe.d/blacklist-watchdog".
  19. Unbreakable Enterprise Kernel firmware must be manually installed prior to upgrade
  20. Due to a change in the way firmware is loaded between the Red Hat Compatible Kernel and the Oracle Unbreakable Enterprise Kernel, you may need to manually install the correct UEK kernel firmware package if you want to boot a previous kernel version after upgrading to Oracle Linux 5.8. For example, to install the firmware for kernel-uek-2.6.32-200.13.1, download the correct RPM package from the Unbreakable Linux Network and run the following command:
    # rpm -ivh --force kernel-uek-firmware-2.6.32-200.13.1.el5uek.noarch.rpm
  21. Memory limited for Oracle Linux 5.8 Paravirtualized Guests
  22. Oracle Linux 5.8 paravirtualized guests running on Oracle VM with the Unbreakable Enterprise Kernel have a memory limit of 220GB. Setting the memory beyond this value may cause the paravirtualized network interfaces to fail.
  23. Oracle Linux 5.8 32-bit guest in HVM with PV Drivers mode with more than 1 vCPU hangs on boot
  24. Attempting to boot a 32-bit HVM guest with PV Drives with more than 1 virtual CPU may fail. To resolve this issue, boot the guest with a single virtual CPU and append tsc=reliable parameter to the kernel boot line in */boot/grub/grub/conf*. You can then boot the guest with multiple virtual CPUs.
  25. kexec/kdump may not work on some server platforms
  26. Certain server platforms may not support the default kdump parameters. To test this, enable kdump and issue:
    echo c > /proc/sysrq-trigger
    If your server hangs indefinitely, you may need to disable the "reset_devices" parameter for kdump. To do this, edit /etc/sysconfig/kdump and remove the "reset_devices" parameter from the KDUMP_COMMANDLINE_APPEND variable.
  27. Using yum to upgrade previous update from Unbreakable Linux Network (ULN)
  28. yum package need to be updated before upgrading previous update releases of Oracle Linux 5 to Oracle Linux 5 Update 8 using yum from ULN. Please use the following steps to upgrade:
       # yum update yum
       # yum update
  29. Default kernel after upgrade
  30. In certain upgrade scenarios the Unbreakable Enterprise Kernel may not be the default boot kernel. Update /etc/grub.conf to make the latest Unbreakable Enterprise Kernel as the default boot kernel.
  31. Missing kernel module ib_iser.ko
  32. Starting OpenFabrics Enterprise Distribution 1.4.2-5 version (ofa package), ib_iser kernel module is not built as part of ofa package. If the ofa package installed on the system tries to load ib_iser.ko, the following message will be displayed on the console
     ib_iser: disagrees about version of symbol ib_fmr_pool_unmap 
     ib_iser: Unknown symbol ib_fmr_pool_unmap 

    These messages can be ignored as ib_iser.ko is no more needed.
  33. Upgrade failure for the full install of Oracle Linux 5
  34. If any of the following packages are installed on the system
    Upgrade of Oracle Linux 5 system may fail with the following error
    An error occured while installing packages.
    Please examine /root/install.log on your 
    installed system for detailed information
    to workaround this problem, remove above packages before upgrade. These packages can be installed after the upgrade.
  35. Failed to stat /dev/mapper/* message during boot of paravirtualized guests
  36. Following messages during boot of paravirtualized guest can be ignored
      Failed to stat /dev/mapper/no
      Failed to stat /dev/mapper/block
      Failed to stat /dev/mapper/devices
      Failed to stat /dev/mapper/found
    These errors are expected as dmraid utility returns 'no block devices found' because an ioctl to get serial numbers on pv devices returns -EINVAL."
  37. Spurious udev messages during restore of a failed path (11682171)
  38. When failed paths are restored in a multipath configuration, you may see udevd-work error messages in /var/log/messages. The failed paths do get restored despite these messages.
  39. Default NFS v4 mount options
  40. The default NFS mount option has changed to NFS v4. To mount an NFS volume using NFS v3 (the default using the Red Hat Compatible Kernel), use the following mount options:
    -o vers=3,mountproto=tcp
  41. Serial console not working for a paravirtualized guest (10059184)
  42. Please use the following steps to configure the serial console in a paravirtualized guest (PV) using the Unbreakable Enterprise kernel (updates are in the guest):
    1. change the kernel boot parameter 'console=xvc0' to 'console=hvc0' in the /etc/grub.conf:
    2.     kernel /vmlinuz-2.6.32-300.10.1.el5 ro root=/dev/sd0 console=tty0 console=hvc0
    3. add an 'hvc0' entry to /etc/inittab:
    4.     co:2345:respawn:/sbin/agetty hvc0 9600 vt100-nav
    5. add an 'hvc0' entry to /etc/securetty
  43. Setting serial console in a hardware virtualized (HVM) guest
  44. To set the serial console a hardware virtualized (HVM) guest use the following settings in the guest:
  45. Console appears to hang while booting on certain systems (10094052)
  46. On some hardware, the console may appear to hang during the boot process after starting udev. But the system does boot up properly and is accessible. A workaround to this problem is to add nomodeset as a kernel boot parameter in /etc/grub.conf:
        kernel /vmlinuz-2.6.32-300.10.1.el5uek.x86_64 ro root=/dev/sd0 nomodeset
  47. Unable to start X (10056679)
  48. On some hardware, startup of the X environment may fail after upgrading to Unbreakable Enterprise Kernel with following Error:
        Fatal server error:
        Cannot run in framebuffer mode. Please specify busIDs for all
        framebuffer devices.
    To workaround this issue reconfigure X using command "X -configure" and use generated configuration file to start X environment.
  49. Higher memory is required for crashkernel option
  50. With the Unbreakable Enterprise Kernel a higher memory setting is required for crashkernel option in /etc/grub.conf file. Booting with crashkernel=128M@16M will result in following error:
        crashkernel reservation failed - memory is in use
    Minimum value for crashkernel option is 128M@32M. Based on the system configuration a higher value may be required. If kdump service loading fails increase the second value (32M). If the system hangs or crashes with out of memory during dumping core increase the first value (128M)
  51. Default IO scheduler
  52. For the Unbreakable Enterprise Kernel, the default IO scheduler is the 'deadline' scheduler.
    For the Red Hat Compatible Kernel, the default IO scheduler is the 'cfq' scheduler.
  53. sched_yield() settings for CFS
  54. For the Unbreakable Enterprise Kernel, kernel.sched_compat_yield=1 by default.
    For the Red Hat Compatible Kernel, kernel.sched_compat_yield=0 by default.
  55. High IO loads on NFS using mmap may fail (11071875)
  56. In some instances, large IO loads on NFS that use mmap may fail and cause the kernel to panic with a message like:
        kernel BUG at mm/truncate.c:469!
  57. NFS: Error message displayed while mounting an NFS filesystem (10070721)
  58. The following error may be encountered while mounting an NFS filesystem:
    This is an informative message and can be ignored
  59. Warning message when kdump starts
  60. When kdump starts, you may see the following warning message:
        WARNING: No modules scsi_mod found for kernel 2.6.32-300.10.1.el5uek.x86_64, continuing anyway
    This warning can be ignored. The kdump service does get started and a vmcore does get generated.
  61. Unable to remove direcory during boot
  62. The following message during boot can be ignored as selinux does not allow to recreate login subdir and hence directory should not be removed for dovecot:
    Error :
      "rm: cannot remove `/var/run/dovecot/login': Is a directory "
  63. Warning during kernel install
  64. The following warnings during kernel install can be ignored:
    WARNING: No module ehci-hcd found for kernel 2.6.32-300.10.1.el5uek, continuing anyway
    WARNING: No module ohci-hcd found for kernel 2.6.32-300.10.1.el5uek, continuing anyway
    WARNING: No module uhci-hcd found for kernel 2.6.32-300.10.1.el5uek, continuing anyway
  65. Upgrade ocfs2 and oracleasm kernel modules
  66. ocfs2 and oracleasm kernel modules will not be automatically updated during upgrade of Oracle Linux 5 as package name for these modules contains kernel version in it. These packages need to be updated manulaly after the upgrade.
  67. device-mapper-multipath package for Red Hat compatible kernel
  68. Unbreakable Enterprise Kernel requires kpartx and device-mapper-multipath RPMs that are newer than those provided for the Red Hat compatible kernel. By default device-mapper-multipath-0.4.9-23.0.9.el5 and kpartx-0.4.9-23.0.9.el5 are installed. These updated versions of kpartx and device-mapper-multipath are supported with the Red Hat compatible kernel. The original RPMs for the Red Hat compatible kernel (kpartx-0.4.7-46.el5 and device-mapper-multipath-0.4.7-46.el5) are also included on the Oracle Linux 5.8 ISO in directory Server/oracle_updated.

  69. Workaround to use pirut and system-config-packages to manage packages
  70. Pirut and system-config-packages cannot be used to manage, install, and uninstall software packages. Follow the steps below to resolve the issue

  • Conflicting packages
  • The following packages can not co-exists due to file conflict

  • Unresolved dependency during update using up2date
  • If updating from Oracle Linux 5 GA or RHEL 5 GA using up2date, you may encounter the following error:
      Unresolvable chain of dependencies:
      xen-3.0.3-64.el5    requires xen-hypervisor-abi = 3.1
    This happens because a kernel-xen package update is needed by the xen package, but 'kernel*' is part of the up2date pkgSkipList. To get around this, add 'xen;xen-devel;' to the the pkgSkipList line in /etc/sysconfig/rhn/up2date and then run up2date. You can update the xen and kernel-xen packages together later via 'up2date --force xen kernel-xen'.

    Oracle Linux Support

    Oracle Linux offers an option to keep your operating system up to date with latest operating system patches using up2date. To access Linux updates via Unbreakable Linux Network, you must purchase a Linux support subscription.For more information please visit

    Note: Prior to using up2date, import the RPM-GPG-KEY for Oracle Linux:

    rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY