Issued:
2013-02-20
Updated:
2013-02-20

RHBA-2013:0423 - trace-cmd bug fix and enhancement update

Synopsis

trace-cmd bug fix and enhancement update

Type/Severity

Bug Fix Advisory

Topic

Updated trace-cmd packages that fix two bugs and add one enhancement are now available for Red Hat Enterprise Linux 6.

Description

The trace-cmd packages contain a command-line tool that interfaces with the ftrace utility in the kernel.

This update fixes the following bugs:

  • The trace-cmd extract command read a buffer multiple times even after an EOF condition. Consequently, the output of the trace-cmd command contained duplicate data. With this update, the trace-cmd utility has been modified to respect the EOF condition and avoid duplication of data in its output. (BZ#746656)

  • When using the latency tracer, the start_threads() function was not called. Calling the stop_threads() function without first calling start_threads() caused the trace-cmd record command to terminate with a segmentation fault because PIDs were not initialized. Consequently, the trace.dat file was not generated. With this update, stop_threads() is not called unless start_threads() is called first. As a result, the segmentation fault no longer occurs. (BZ#879792)

In addition, this update adds the following enhancement:

  • Previously, the trace-cmd record command was able to filter ftrace data based on a single PID only. With this update, multiple PIDs can be specified by using the "-P" option. (BZ#838746)

Users of trace-cmd are advised to upgrade to these updated packages, which fix these bugs and add this enhancement.

Solution

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

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/knowledge/articles/11258

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Scientific Computing6x86_64
Red Hat Enterprise Linux for Power, big endian6ppc64
Red Hat Enterprise Linux for IBM z Systems6s390x
Red Hat Enterprise Linux Workstation6x86_64
Red Hat Enterprise Linux Workstation6i386
Red Hat Enterprise Linux Server6x86_64
Red Hat Enterprise Linux Server6i386
Red Hat Enterprise Linux Server from RHUI6x86_64
Red Hat Enterprise Linux Server from RHUI6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems)6s390x
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)6s390x
Red Hat Enterprise Linux Desktop6x86_64
Red Hat Enterprise Linux Desktop6i386

Updated Packages

  • trace-cmd-1.0.5-10.el6.src.rpm
  • trace-cmd-1.0.5-10.el6.i686.rpm
  • trace-cmd-debuginfo-1.0.5-10.el6.x86_64.rpm
  • trace-cmd-1.0.5-10.el6.s390x.rpm
  • trace-cmd-1.0.5-10.el6.x86_64.rpm
  • trace-cmd-debuginfo-1.0.5-10.el6.i686.rpm
  • trace-cmd-1.0.5-10.el6.ppc64.rpm
  • trace-cmd-debuginfo-1.0.5-10.el6.ppc64.rpm
  • trace-cmd-debuginfo-1.0.5-10.el6.s390x.rpm

Fixes

CVEs

(none)

References

(none)

Additional information