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Old 04-27-2012, 02:33 PM
Dave Anderson
Default crash version 6.0.6 is available

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


- Extend the supported cross-architecture build capability so that
it applies to the SIAL extension module. Without the patch,
when building the SIAL module in an environment where the
overlying crash utility was built with "make target=ARM",
"make target=PPC", or "make target=X86", the SIAL extension
module would continue to be built for the host architecture.
(rabin@rab.in, anderson@redhat.com)

- Fixes for memory leaks and possible segmentation violations
when unloading SIAL extension module scripts.

- Fix for the new "foreach RU" task state qualifier. Without the
patch, the runnable tasks are not selected.

- Fix to disallow multiple task states from being entered using
the "foreach <task-state>" qualifier. Without the patch, if
multiple states were entered, the last one on the command line
would be honored.

- Fix for the "extend" command to allow the usage of 32-bit PPC
extension modules. Without the patch, the command fails with the
message: "extend: <object>.so: not an ELF format object file".

- If an input line starts with "#" or "//", then the line will be
saved as a comment that is visible when re-cycling through the
command history list.
(olivier.daudel@u-paris10.fr, anderson@redhat.com)

- Fix for a crash-5.1.9 regression that broke the "bt -g" option.
Without the patch, the option is ignored completely.

- Fix for s390x virtual-to-physical translation of virtual addresses
that are backed by 1MB pages.

- The s390x has a dumpfile method that creates "live dumps", where
the kernel continues to run while the dumpfile is being created.
The initial system banner display and the "sys" command will inform
the user that the dumpfile is a "[LIVE DUMP]", and the "bt -a" option
will fail with the message "bt: -a option not supported on a live
system or live dump".

- Newly-created dumpfiles generated by the "snap.c" extension module
will now be recognized as "live dumps". Accordingly, the initial
system banner display and the "sys" command will inform the user that
the dumpfile is a "[LIVE DUMP]", and the "bt -a" option will fail
with the message "bt: -a option not supported on a live system or
live dump".

- If "bt" alone is attempted on an active task in a "live dump", it
will indicate "(active)", i.e., the same as if it were attempted on
a live system.

- If an extension module does not define the appropriate architecture,
i.e., "-DX86", "-DX86_64", etc., then the inclusion of "defs.h" will
generate a compiler failure indicating "error: 'NR_CPUS' undeclared
here (not in a function)". In that case, the architecture will now
default to that of the host machine.

- Prevent a highly-unlikely incorrect calculation of the maximum
cpudata array length of a kmem_cache during initialization of
of CONFIG_SLAB kernels.

- Prevent an infinite loop during the initialization of the kmem_cache
subsystem in CONFIG_SLAB kernels if the cache list or the vmcore is
corrupt. If the kmem_cache list links back into itself, messages
showing the first "duplicate" entry in the list and "crash: unable
to initialize kmem slab cache subsystem" will be displayed.

- Update to the "mod" command to additionally search for module object
files in the directory containing the kernel namelist (vmlinux) file.
This will allow an alternate module-debuginfo directory tree to be
set up like so:

# cd <directory>
# rpm2cpio kernel-debuginfo-<release>.rpm | cpio -idv

Having done that, and by referencing the vmlinux file in that
directory tree directly or by symbolic link, the "mod" command
will search for module object files starting from the directory
containing the vmlinux file if they are not found in the standard
/lib/modules/<release> directory.
(shane.seymour@hp.com, anderson@redhat.com)

- Update to the s390x "bt" command if a task was running in userspace.
Without the patch, the back trace display ended at the kernel entry
function frame; with the patch, the user space PSW register is
displayed with a "(user space)" tag, followed by the general purpose
register set.

- In the unlikely event that the access of ARM or x86_64 kernel unwind
table data fails during crash invocation, print a warning message and
allow the crash session to continue. Without the patch, the crash
session would fail immediately.
(Jan.Karlsson@sonymobile.com, anderson@redhat.com)

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