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Old 12-23-2010, 06:27 PM
Dave Anderson
Default crash version 5.1.1 is available

- Fix for the potential to miss tasks when walking the pid_hash table
in 2.6.24 and later kernels. Without the patch, the task will simply
not be seen in the gathered task list.

- Enhancement for the ARM architecture's "bt" command to print out
the user space register set for tasks entering the kernel via the
syscall entry point.

- Rework of the handling of "set" commands that are put in .crashrc
files so that only the following options are resolved prior to
session initialization: silent, console, core, edit, namelist, and
zero_excluded. All others are resolved immediately after session
initialization is complete. Accordingly, the use of "set -c <cpu>",
"set -p", "set -a [task|pid]" and set [pid|task]" are now acceptable
.crashrc commands.

- The entering of "set -v" in a .crashrc file would cause an immediate
segmentation violation. The "set" command rework above defers the
command until session initialization is complete.

- The entering of "set dumpfile <filename>" in a .crashrc file would
cause a fatal "seek" error during session initalization with most
most dumpfile types, so the "dumpfile" option has been removed from
the "set" command.

- The execution of "alias" commands from a .crashrc file used to be
performed immediately; that behavior has been changed so that they
are executed immediately after session initialization is complete.

- Enhancement of the "repeat" command to allow command aliases.

- Fix for running "kmem -s" on a live system if an offline cpu is
brought back online while the command is executing. Without the
patch, the online operation may cause a segmentation violation.

- Change the behavior of "bt -[tT]" to allow the command options
to be run on active tasks on live systems. Without the patch,
both command options would display the task data banner followed
by "(active)".

- Fix for the ARM architecuture's "irq" command when run on 2.6.36
and later kernels. Without the patch, the command fails with the
error message "irq: invalid kernel virtual address: 23 type:
irq_chip typename". The fix replaces the custom ARM IRQ dumping
function with the architecture-neutral version.

- Introduced support for using /proc/kcore as an alternative source of
live memory to /dev/mem. Doing so allows vmalloc memory access on
32-bit architectures when the underlying mapped physical memory is in
highmem, which is not allowed by the /dev/mem driver. It would also
be usable on systems that are configured with CONFIG_STRICT_DEVMEM
but still configured with CONFIG_PROC_KCORE. To enforce the use of
/proc/kcore, it may be entered on the command line.

- If a live crash session attempts to use /dev/mem as a live memory
source, and it is determined that the system is configured with
CONFIG_STRICT_DEVMEM, /proc/kcore will automatically be tried as
an alternative.

- Fix to allow "/dev/crash" to be entered on the command line for live
sessions. Because it is used automatically if it exists, it is never
necessary to enter it on the command line. However, if it is used,
without the patch, the session fails during initializaion with the
error message "crash: /dev/crash: No such file or directory" if the
crash.ko driver is a module (RHEL4/RHEL5), or "crash: /dev/crash:
not a supported file format" if the driver is built into the kernel

- Fix for the ARM "bt" command to address the issue behind faulty
warning messages that indicate "WARNING: UNWIND: unsupported
personality routine".

- Fix for the ARM "bt" command to address the issue behind faulty
warning messages that indicate "bt: WARNING: UNWIND: cannot find
index for <address>".

Download from: http://people.redhat.com/anderson

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