RHBA-2015:1333 - Bug Fix Advisory

Topic

Updated systemtap packages that fix several bugs and add various enhancements
are now available for Red Hat Enterprise Linux 6.

Description

SystemTap is an instrumentation system for systems running the Linux kernel,
which allows developers to write scripts to collect data on the operation of the
system.

The systemtap packages have been upgraded to upstream version 2.7, which
provides a number of bug fixes and enhancements over the previous version.
(BZ#1158682)

This update also fixes the following bugs:

• Previously, some startup-time scripts required the "uprobes.ko" module built,

installed, or loaded, but the init script did not identify whether and how to do
so. A patch has been applied to fix this bug, and the init script now performs
the appropriate operations. (BZ#1118352)

• Prior to this update, the systemtap scripts caused the "scheduling while

atomic" error when running on the Messaging Real-time Grid kernel. To fix this
bug, patches have been applied, and the error no longer occurs. (BZ#1147647)

• The systemtap's "tapset" system call unconditionally included support for the

"execveat" system call, even though "execveat" did not exist in Red Hat
Enterprise Linux 6 kernels. Consequently, system call probing scripts could fail
with a semantic error. With this update, "execveat" is treated conditionally,
and the scripts no longer fail in this situation. (BZ#1195839)

Users of systemtap are advised to upgrade to these updated packages, which fix
these bugs and add these enhancements.

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 Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 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 Desktop 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• 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

• BZ - 1111106 - setjmp-longjmp tracing regression (s390x)
• BZ - 1118352 - initscript unaware of uprobes
• BZ - 1147647 - Systemtap is causing 'BUG: scheduling while atomic' on MRG Realtime kernel
• BZ - 1158682 - rebase systemtap for rhel6.7
• BZ - 1195838 - stap -V reports wrong two elfutils version numbers
• BZ - 1195839 - no execveat in rhel6 kernel

CVEs

(none)

References

(none)