This section describes known issues in this update.
One some systems you might see ACPI-related error messages in
dmesg
similar to the following:
ACPI Error: [CDW1] Namespace lookup failure, AE_NOT_FOUND ACPI Error: Method parse/execution failed [_SB_._OSC||\||] ACPI Error: Field [CDW3] at 96 exceeds Buffer [NULL] size 64 (bits)]]>
These messages, which are not fatal, are caused by bugs in the BIOS. Contact your system vendor for a BIOS update. (Bug ID 13100702)
Calling the oracleasm
init
script,
/etc/init.d/oracleasm
, with the parameter
scandisks
can lead to error messages about
missing devices similar to the following:
oracleasm-read-label: Unable to open device "device
": No such file or directory
However, the device actually exists. You can ignore this error
message, which is triggered by a timing issue. Only use the
init
script to start and stop the
oracleasm
service. All other options, such
as scandisks, listdisk
, and
createdisk
, are deprecated. For these and
other administrative tasks, use
/usr/sbin/oracleasm
instead. (Bug ID
13639337)
When using the bnx2x
driver in a bridge,
disable Transparent Packet Aggregation (TPA) by including the
statement options bnx2x disable_tpa=1
in
/etc/modprobe.conf
. (Bug ID 14626070)
Running btrfs filesystem balance converts a non-RAID or concatenated file system setup to RAID-0 after adding a new device. (Bug ID 13715389)
Converting an existing
ext2
,ext3
, orext4
root file system tobtrfs
does not carry over the associated security contexts that are stored as part of a file's extended attributes. With SELinux enabled and set to enforcing mode, you might experience many permission denied errors after reboot, and the system might be unbootable. To avoid this problem, enforce automatic file system relabeling to run at bootup time. To trigger automatic relabeling, create an empty file named.autorelabel
(for example, by using touch) in the file system'sroot
directory before rebooting the system after the initial conversion. The presence of this file instruct SELinux to recreate the security attributes for all files on the file system. If you forget to do this and rebooting fails, either temporarily disable SELinux completely by addingselinux=0
to the kernel boot parameters, or disable enforcing of the SELinux policy by addingenforcing=0
. (Bug ID 13806043)A failing RAID1 disk might result in a kernel panic with the error kernel:
BTRFS error (device (null)) in btree_writepage_io_failed_hook:3662: \ IO failure (Error occurred while writing out btree at offset).
(Bug ID 16262571)
The btrfs subvolume get-default command lists all existing subvolumes instead of only the default subvolume. (Bug ID 13815433)
The btrfs filesystem defragment command exits with an exit code of 20 even if it succeeds. (Bug ID 13714531)
Commands such as du might show inconsistent results for file sizes in a
btrfs
file system when the number of bytes that is under delayed allocation is changing. (Bug ID 13096268)Btrfs has a limit of 237 hard links to a file. Attempting to create more than this number of links results in the error
Too many links
. (Bug ID 16278563)
When running Oracle Linux with UEK R2, you might see error
messages in dmesg
or
/var/log/messages
similar to this one:
microcode: CPU0 update to revision 0x6b failed.
You can ignore this warning. You do not need to upgrade the microcode for virtual CPUs as presented to the guest. (Bug ID 12576264, 13782843)
The Unbreakable Enterprise Kernel uses the
deadline
scheduler as the default I/O
scheduler. For the Red Hat Compatible Kernel, the default I/O
scheduler is the cfq
scheduler.
The following message might appear in dmesg
or /var/log/messages
:
WARNING! power/level is deprecated; use power/control instead.
The USB subsystem in UEK R2 deprecates the
power/level sysfs
attribute in favor of the
power/control
attribute. The
libfprint
fingerprinting library triggers
this warning via udev
rules that try to use
the old attribute first. You can safely ignore this warning.
The setting of the appropriate power level still succeeds.
(Bug ID 13523418)
After upgrading to UEK R2, the NVIDIA driver upgrade script
does not correctly blacklist the Nouveau kernel driver. To
blacklist the driver, append rdblacklist=nouveau
nouveau.modeset=0
to the kernel boot parameters in
/boot/grub/grub.conf
.
For the Unbreakable Enterprise Kernel,
kernel.sched_compat_yield=1
is set by
default. For the Red Hat Compatible Kernel,
kernel.sched_compat_yield=0
is used by
default.
A message similar to the following might be recorded in
dmesg
or
/var/log/messages
at boot time:
udevd (pid
): /proc/pid
/oom_adj is deprecated, please use /proc/pid
/oom_score_adj instead.
The udev
process uses the deprecated
oom_adj
kernel interface to prevent it from
being killed if the system runs short of memory. You can
safely ignore the message as the action still succeeds. To
prevent the message from occurring, install the package
udev-147-2.42.el6.
or higher for Oracle Linux 6, or
arch
.rpmudev-095-14.29.0.1.el5.
or higher for Oracle Linux 5. (Bug ID 13655071 and 13712009)
arch
.rpm