Red Hat ENTERPRISE LINUX 5.5 - S 2010, Manual

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Chapter 1. Package Updates
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* if a dump was collected when there were one or more cpus offline in the system, an initialization-time
failure would occur and the crash would abort. A patch was backported from upstream and the failure
no longer occurs. (
BZ#520506
222
)
* running the 64-bit bt command could potentially start the backtrace of an active non-crashing
task on its per-cpu IRQ stack, cause a faulty transition back to the process stack, the dumping of a
bogus exception frame and the message "bt: WARNING: possibly bogus exception frame". The bt
command was changed and it now starts from the NMI exception stack, the error no longer occurs.
(
BZ#523512
223
)
* when the cpu_possible_map contains more CPUs than the cpu_online_map, the set, bt, runq
and ps commands would reflect the existing but unused swapper tasks on the non-existent CPUs.
The 64-bit PowerPC CPU count determination was fixed and the commands now run as expected.
(
BZ#550419
224
)
* when INIT-generated pseudo-tasks were running in user-space and the kernel was unable to modify
the kernel stack, the backtrace would not identify the interrupted task and would display a "bt: unwind:
failed to locate return link" error message. The Itanium backtraces were fixed, and the backtrace now
offers information regarding the task that was interrupted. The error message is also suppressed. (BZ
#553353)
* using dump to analyze very large xendump core files with ELF sections located beyond a file offset
of 4GB resulted in errors. Changes were made to the xc_core_verify() initialization code and dump
now works as expected. (BZ #561767)
* The crash utility was rebased. See the changelog linked to in the references section below for full
details. (
BZ#528184
225
)
All users of crash are advised to upgrade to these updated packages, which resolve these issues.
1.28. ctdb
1.28.1. RHEA-2010:0320: enhancement update
The ctdb package is now available on the ClusterStorage channel.
CTDB is a clustered database based on Samba's Trivial Database (TDB). The ctdb package is
a cluster implementation used to store temporary data. If an application is already using TBD for
temporary data storage, it can be very easily converted to be cluster-aware and use CTDB.
This update makes the following change:
* CTDB was previously available in the Supplementary channel and is now available in the
ClusterStorage channel. (
BZ#558493
226
)
Note that CTDB is included as a Technology Preview. Technology Preview features are included
in Red Hat Enterprise Linux to provide the features with wide exposure, with the goal of supporting
these features in a future release of Red Hat Enterprise Linux. Technology Preview features are not
supported under Red Hat Enterprise Linux 5.5 subscription services, and may not be functionally
222
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=520506
223
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=523512
224
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=550419
225
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=528184
226
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=558493