RHBA-2015:2654 - Bug Fix Advisory

Topic

Updated udev packages that fix two bugs are now available for Red Hat Enterprise
Linux 6.

Description

The udev packages implement a dynamic device-directory, providing only the
devices present on the system. This dynamic directory runs in user space,
dynamically creates and removes devices, provides consistent naming, and a
user-space API. The udev packages replace the devfs package and provide better
hot plug functionality.

This update fixes the following bugs:

• Module autoloading was previously turned on for every device, even if a

driver for the device was already loaded, because Intelligent Platform
Management Interface (IPMI) devices required this setting. Consequently, too
many modprobe instances were executed. This update allows modprobe for IPMI
devices only if a driver is already loaded, and module autoloading thus works as
expected. Now, all other drivers are not accessed again, which results in a
decrease in workload. (BZ#1281467)

• Previously, the modprobe execution could be done in parallel with an

infinite number of other modprobe executions, which led to hundreds of modprobes
running in parallel. This update limits the maximum number of workers which are
spawned additionally to the count governed by the max_childs setting.
Note that it is highly recommended to adjust the size of the kernel log buffer
when logging to a serial console (log_buf_len=4M on kernel command line), as
affected systems are able to boot even without any fixes now provided.
(BZ#1281469)

Users of udev are advised to upgrade to these updated packages, which fix these
bugs.

Solution

Before applying this update, make sure all previously released errata relevant
to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.7 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.7 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux for SAP Solutions for x86_64 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.7 i386
• Red Hat Enterprise Linux EUS Compute Node 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

CVEs

(none)

References

(none)