kernel
component
When Single Root I/O Virtualization (SR-IOV) is enabled on mlx4 adapters, initialization of the mlx4_core
module can take longer than 30 seconds. However, udev
has a 30-second timer for hardware initialization and terminates the modprobe sequence if the time is exceeded. As a consequence, the mlx4_en
and mlx4_ib
modules are not loaded after the mlx4_core
module has finished initializing.
Two workarounds are available:
To work around the udev
time limit, run the rmmod mlx4_core; modprobe mlx4_core
command on a system that does not run on mlx4 hardware. Running this command enables you to have the full configured number of virtual devices, but for example guest operating systems that are configured to start on boot may need to be started manually once all the devices are present.
Alternatively, reduce either the total number of virtual functions that are enabled on the card, or functions that are probed by the guest driver, or both, until the card initialization sequence can be reliably completed in less than 30 seconds. However, you can be limited in the number of guests you can run due to insufficient virtual functions.
kernel
component, BZ#1126294
The modprobe configuration file does not use the full path name of the modprobe
binary file. As a consequence, modprobe fails to load the ib_qib
module. To work around this problem, run the modprobe ib_qib
command after each boot. Alternatively, to fix the problem permanently, edit the /etc/modprobe.d/truescale.conf
and change the instance of modprobe to be /sbin/modprobe. As a result, the ib_qib
module loads as expected.
kernel
component
Sun Fire X4500 data server enumerates the e1000 card with Peripheral Component Interconnect Extended (PCI-X) and enables 64-bit direct memory access (DMA), however, 64-bit DMA is not fully supported on this hardware. If possible, disable 64-bit DMA in BIOS.
grubby
component
Use of multiboot images makes discerning different image types problematic during kernel updates. As a consequence, using the tboot package and multiple types of kernels at the same time does not work properly. If, for example, tboot is in use and the kernel-debug package is installed, bootloader configuration can sometimes reflect an incorrect image list. To avoid this, do not use the kernel-debug on a system utilizing tboot, or vice versa. If such a situation is unavoidable, manually verify that the bootloader configuration is reasonable after each update before rebooting.
kexec-tools
component
When the debug kernel is installed and also used as the Red Hat Enterprise Linux kdump kernel, the reserved kdump memory must be increased to a minimum of 256 MB. To assure this setting, start the
system-config-kdump tool, modify the kdump memory, and reboot your Linux instance. Alternatively, you can configure a particular kernel that is always used as the kdump kernel, independently of the running kernel. For more information, consult the
Red Hat Enterprise Linux 6 Deployment Guide.
kernel
component
Red Hat Enterprise Linux 6.4 changed the maximum read/write socket memory default value to be higher, allowing for better performance on some machines. It was observed that if the values of ?mem_max
are not symmetrical between two machines, the performance can be negatively affected. To work around this problem, adjust the value of ?mem_max
to be equal across all Red Hat Enterprise Linux systems in the network.
kabi-whitelists
component
The vxfs module might not work properly on Red Hat Enterprise Linux 6.4 and later because of the broken radix_tree_gang_lookup_slot
symbol. Consult Symantec should you require a workaround for this issue.
kernel
component
Enabling TCP Segmentation Offload (TSO) on TAP interface may cause low throughput when the uplink is a high-speed interface. To improve throughput, turn off TSO on the tap interface of the virtual machine.
kernel
component
When using Chelsio's iSCSI HBAs for an iSCSI root partition, the first boot after install fails. This occurs because Chelsio's iSCSI HBA is not properly detected. To work around this issue, users must add the iscsi_firmware
parameter to grub's kernel command line. This will signal to dracut to boot from the iSCSI HBA.
kernel
component
The installation of Red Hat Enterprise Linux 6.3 i386 and later may occasionally fail. To work around this issue, add the following parameter to the kernel command line:
vmalloc=256MB
kernel
component
If a device reports an error, while it is opened (via the open(2)
system call), then the device is closed (via the close(2)
system call), and the /dev/disk/by-id
link for the device may be removed. When the problem on the device that caused the error is resolved, the by-id
link is not re-created. To work around this issue, run the following command:
~]# echo 'change' > /sys/class/block/sdX/uevent
kernel
component
When an HBA that uses the mpt2sas
driver is connected to a storage using an SAS switch LSI SAS 6160, the driver may become unresponsive during Controller Fail Drive Fail (CFDF) testing. This is due to faulty firmware that is present on the switch. To fix this issue, use a newer version (14.00.00.00 or later) of firmware for the LSI SAS 6160 switch.
kernel
component, BZ#745713
In some cases, Red Hat Enterprise Linux 6 guests running fully-virtualized under Red Hat Enterprise Linux 5 experience a time drift or fail to boot. In other cases, drifting may start after migration of the virtual machine to a host with different speed. This is due to limitations in the Red Hat Enterprise Linux 5 Xen hypervisor. To work around this, add the nohpet
parameter or, alternatively, the clocksource=jiffies
parameter to the kernel command line of the guest. Or, if running under Red Hat Enterprise Linux 5.7 or newer, locate the guest configuration file for the guest and add the hpet=0
parameter in it.
kernel
component
On some systems, Xen full-virt guests may print the following message when booting:
WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing <number>MB of RAM
It is possible to avoid the memory trimming by using the disable_mtrr_trim
kernel command line option.
kernel
component
On 64-bit PowerPC, the following command may cause kernel panic:
~]# ./perf record -agT -e sched:sched_switch -F 100 -- sleep 3
kernel
component
Applications are increasingly using more than 1024 file descriptors. It is not recommended to increase the default soft limit of file descriptors because it may break applications that use the select()
call. However, it is safe to increase the default hard limit; that way, applications requiring a large amount of file descriptors can increase their soft limit without needing root privileges and without any user intervention.
kernel
component
In network only use of Brocade Converged Network Adapters (CNAs), switches that are not properly configured to work with Brocade FCoE functionality can cause a continuous linkup/linkdown condition. This causes continuous messages on the host console:
bfa xxxx:xx:xx.x: Base port (WWN = xx:xx:xx:xx:xx:xx:xx:xx) lost fabric connectivity
To work around this issue, unload the Brocade bfa
driver.
kernel
component
In Red Hat Enterprise Linux 6, a legacy bug in the PowerEdge Expandable RAID Controller 5 (PERC5) which causes the kdump kernel to fail to scan for scsi
devices. It is usually triggered when a large amounts of I/O operations are pending on the controller in the first kernel before performing a kdump.
kernel
component, BZ#679262
In Red Hat Enterprise Linux 6.2 and later, due to security concerns, addresses in /proc/kallsyms
and /proc/modules
show all zeros when accessed by a non-root user.
kernel
component
Superfluous information is displayed on the console due to a correctable machine check error occurring. This information can be safely ignored by the user. Machine check error reporting can be disabled by using the nomce
kernel boot option, which disables machine check error reporting, or the mce=ignore_ce
kernel boot option, which disables correctable machine check error reporting.
-
kernel
component
The order in which PCI devices are scanned may change from one major Red Hat Enterprise Linux release to another. This may result in device names changing, for example, when upgrading from Red Hat Enterprise Linux 5 to 6. You must confirm that a device you refer to during installation, is the intended device.
One way to assure the correctness of device names is to, in some configurations, determine the mapping from the controller name to the controller's PCI address in the older release, and then compare this to the mapping in the newer release, to ensure that the device name is as expected.
The following is an example from /var/log/messages:
kernel: cciss0: <0x3230> at PCI 0000:1f:00.0 IRQ 71 using DAC
…
kernel: cciss1: <0x3230> at PCI 0000:02:00.0 IRQ 75 using DAC
If the device name is incorrect, add the pci=bfsort
parameter to the kernel command line, and check again.
kernel
component
The minimum firmware version for NIC adapters managed by netxen_nic
is 4.0.550. This includes the boot firmware which is flashed in option ROM on the adapter itself.
kernel
component
High stress on 64-bit IBM POWER series machines prevents kdump from successfully capturing the vmcore
. As a result, the second kernel is not loaded, and the system becomes unresponsive.
kernel
component
Triggering kdump to capture a vmcore
through the network using the Intel 82575EB ethernet device in a 32 bit environment causes the networking driver to not function properly in the kdump kernel, and prevent the vmcore
from being captured.
-
kernel
component
Memory Type Range Register (MTRR) setup on some hyperthreaded machines may be incorrect following a suspend/resume cycle. This can cause graphics performance (specifically, scrolling) to slow considerably after a suspend/resume cycle.
To work around this issue, disable and then re-enable the hyperthreaded sibling CPUs around suspend/resume, for example:
#!/bin/sh
# Disable hyper-threading processor cores on suspend and hibernate, re-enable
# on resume.
# This file goes into /etc/pm/sleep.d/
case $1 in
hibernate|suspend)
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 0 > /sys/devices/system/cpu/cpu3/online
;;
thaw|resume)
echo 1 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu3/online
;;
esac
kernel
component
In Red Hat Enterprise Linux 6.2, nmi_watchdog
registers with the perf
subsystem. Consequently, during boot, the perf
subsystem grabs control of the performance counter registers, blocking OProfile from working. To resolve this, either boot with the nmi_watchdog=0
kernel parameter set, or run the following command to disable it at run time:
echo 0 > /proc/sys/kernel/nmi_watchdog
To re-enable nmi-watchdog
, use the following command
echo 1 > /proc/sys/kernel/nmi_watchdog
kernel
component, BZ#603911
Due to the way ftrace works when modifying the code during start-up, the NMI watchdog causes too much noise and ftrace can not find a quiet period to instrument the code. Consequently, machines with more than 512 CPUs will encounter issues with the NMI watchdog. Such issues will return error messages similar to BUG: NMI Watchdog detected LOCKUP
and have either ftrace_modify_code
or ipi_handler
in the backtrace. To work around this issue, disable NMI watchdog by setting the nmi_watchdog=0
kernel parameter, or using the following command at run time:
echo 0 > /proc/sys/kernel/nmi_watchdog
kernel
component
On 64-bit POWER systems the EHEA NIC driver will fail when attempting to dump a vmcore
via NFS. To work around this issue, utilize other kdump facilities, for example dumping to the local file system, or dumping over SSH.
kernel
component, BZ#587909
A BIOS emulated floppy disk might cause the installation or kernel boot process to hang. To avoid this, disable emulated floppy disk support in the BIOS.
kernel
component
The preferred method to enable nmi_watchdog on 32-bit x86 systems is to use either nmi_watchdog=2
or nmi_watchdog=lapic
parameters. The parameter nmi_watchdog=1
is not supported.
-
kernel
component
The kernel parameter, pci=noioapicquirk
, is required when installing the 32-bit variant of Red Hat Enterprise Linux 6 on HP xw9300 workstations. Note that the parameter change is not required when installing the 64-bit variant.