2:32 p.m.
Download from: http://people.redhat.com/anderson
or
https://github.com/crash-utility/crash/releases
The master branch serves as a development branch that will contain all
patches that are queued for the next release:
$ git clone git://github.com/crash-utility/crash.git
Changelog:
- Export the static ELF and compressed kdump vmcoreinfo_read_string()
functions from netdump.c and kdump.c via a new read_vmcoreinfo()
method in the global program_context structure. The function
get_log_from_vmcoreinfo() will access vmcoreinfo data via the
new pointer instead of requiring its callers to pass pointers to
their dumpfile-specific function.
(anderson(a)redhat.com)
- Linux 3.15 and later kernels configured with CONFIG_RANDOMIZE_BASE
can be now be readily identified because of new kernel symbols that
have been added. For those kernels, the new "--kaslr=<offset>"
and/or "--kaslr=auto" options are not necessary for ELF or compressed
kdump vmcores, or for live systems that have /proc/kallsyms showing
the relocated symbol values. A new KASLR initialization function
called kaslr_init() is now called by symtab_init() prior to the
initial symbol-sorting operation. If kaslr_init() determines that
KASLR may be in effect, it will trigger a search for the relevant
vmlinux symbols during the sorting operation, which in turn will
cause the relocation value to be automatically calculated.
(anderson(a)redhat.com)
- Implemented a new "bt -c cpu(s)" option to display the backtrace
of the active task on one or more cpus. The cpus must be specified
in a comma- and/or dash-separated list; for examples ""3",
"1,8,9",
"1-23", or "1,8,9-14". Similar to "bt -a", the option is
only
applicable with crash dumps.
(atomlin(a)redhat.com)
- Fix for Linux 3.11 and later ARM kernels, in which all non-panicking
cpus offline themselves during a kdump procedure. This causes an
invalid cpu count determination during crash session initialization
from an ARM vmcore. The patch utilizes the cpu count found in the
cpu_active_map if it is greater than the count in the cpu_online_map.
In addition, the maximum NR_CPUS value for the ARM architecture has
been raised from 4 to 32.
(sdu.liu(a)huawei.com)
- Fix for the X86_64 "bt" command on Linux 3.3 and later kernels to
properly display exception frame register contents on NMI stacks.
Kernel commit 3f3c8b8c4b2a34776c3470142a7c8baafcda6eb0 added 12 more
values to the NMI exception stack to handle nested NMIs caused by
page faults or breakpoints that could occur while handling an NMI
exception. The fix has two parts:
1. Determine if this kernel has the nested NMI layout and set a
machine-specific flag (NESTED_NMI) if it does.
2. When backtracing an NMI stack, use the saved values instead of
those found at the top of stack.
Kernel commit 28696f434fef0efa97534b59986ad33b9c4df7f8 changed
the stack layout again, swapping the location of the "saved" and
"copied" registers. This can be detected automatically, because the
"copied" registers contain either a copy of the "saved" registers,
or point to "repeat_nmi". So, if "repeat_nmi" is found as the
return
address, assume that this is the old layout, and adjust the stack
pointer again. Without the patch, incorrect register values are
displayed in the exception frame dump in the NMI stack backtrace.
(ptesarik(a)suse.cz)
- Fix for the built-in "g" alias, which apparently has not worked
correctly since crash-5.1.4. Without the patch, if the "g" alias
and the first argument are separated by one space, then the first
first character of that argument would get stripped prior to being
passed to the embedded gdb module.
(anderson(a)redhat.com)
- Removed the BASELEVEL_REVISION string from defs.h, which serves no
purpose since the deprecation of the remote daemon, and typically
has been out of sync with the crash version.
(anderson(a)redhat.com)
- Fix for the "p", "irq", "struct", "union" and
"*" commands if a
cpu specification contains an invalid cpu number. Without the
patch, a segmentation violation may be generated.
(anderson(a)redhat.com)
- Implemented a new capability for the "ptov" command that takes a
per-cpu offset and cpu specification argument and translates it
into the kernel virtual addresses for the cpus specified.
(anderson(a)redhat.com)
- Implemented a new "ps -m" option that is a similar, complementary
option to "ps -l", but which translates the task timestamp value from
a decimal or hexadecimal nanoseconds value into a more human-readable
string consisting of the number of days, hours, minutes, seconds and
milliseconds that have elapsed since the task started executing on a
cpu. More accurately described, it is the time difference between
the timestamp copied from the per-cpu runqueue clock when the task
last started executing compared to the most current value of the
per-cpu runqueue clock.
(anderson(a)redhat.com, bud.brown(a)redhat.com)
- In addition, a new "ps -C <cpu-specifier>" option has been added
that can only be used with "ps -l" and "ps -m", which sorts the
global task list into per-cpu blocks; the cpu-specifier uses the
standard comma or dash separated list, expressed as "-C 1,3,5",
"-C 1-3", "-C 1,3,5-7,10", or "-Call" or "-Ca"
for all cpus.
(anderson(a)redhat.com)
- Implemented a new "runq -m" option that is a simliar, complementary
option to "runq -t", but which displays the amount of time that the
active task on each cpu has been running, expressed in a format
consisting of days, hours, minutes, seconds and milliseconds.
(anderson(a)redhat.com)
- Implemented a new "kmem -h" option that displays the address of
each hugepage hstate array entry, its hugepage size, its free and
total counts, and name string.
(anderson(a)redhat.com)
- Implemented a new "ps -S" option that displays a summary consisting
of the number of tasks in a task state.
(anderson(a)redhat.com)
- Fix for the "arguments-input-file" feature to protect against a
called command modifying an argument string. For example, the
"struct" command modifies "-l struct_name.member" argument
strings,
and so without the patch, all iterative calls after the first one
will fail.
(anderson(a)redhat.com)
- Fix failure to build from source when compiling the crash utility
with gcc-4.9. Without the patch, the crash utility build generates
the following error:
In file included from opncls.c:26:0:
opncls.c: In function 'bfd_fopen':
bfd.h:529:65: error: right-hand operand of comma expression has no
effect [-Werror=unused-value]
#define bfd_set_cacheable(abfd,bool) (((abfd)->cacheable = bool), TRUE)
^
opncls.c:263:5: note: in expansion of macro 'bfd_set_cacheable'
bfd_set_cacheable (nbfd, TRUE);
cc1: all warnings being treated as errors
(anderson(a)redhat.com, anatol.pomozov(a)gmail.com)
- Fix for displaying enum values that are greater than 32-bits in
size. Without the patch, the upper 32-bits are clipped off and
displayed as integer-sized value.
(anderson(a)redhat.com)
- If the kernel (live or dumpfile) has the "kpatch" module installed,
the tag "[KPATCH]" will be displayed next to the kernel name in the
initial system banner and by the "sys" command.
(anderson(a)redhat.com)
- Fix for the "DEBUG KERNEL:" display in the initial system banner
and by the "sys" command when using a System.map file with a
Linux 3.0 and later debug kernel. Without the patch, the kernel
version is not displayed in parentheses following the debug kernel
name.
(anderson(a)redhat.com)
- If the gdb-<version>.patch file has changed and a rebuild is being
done from within a previously-existing build tree, "patch -N" the
gdb sources, and start the rebuild from the gdb-<version> directory
instead of the gdb-<version>/gdb directory.
(anderson(a)redhat.com)
- Fix to prevent a possible segmentation violation generated by the
"runq -g" command when run on a very active live system due to an
active task on a cpu exiting while the command is running.
(anderson(a)redhat.com)
- Fix for the "runq -g" command on Linux 3.15 and later kernels, where
the cgroup_name() function now utilizes kernfs_name(). Without the
patch, the command fails with the error message "runq: invalid
structure member offset: cgroup_dentry".
(anderson(a)redhat.com)
- Fix for the "extend" command when running with an x86_64 crash binary
that was built with "make target=ARM64" in order to analyze ARM64
dumpfiles on an x86_64 host. Without the patch, if the extend
command is used with an extension module built in the same manner,
it fails with the message "extend: <module>.so: not an ELF format
object file".
(Jan.Karlsson(a)sonymobile.com)
- Introduce support for 32-bit ARM kernels that are configured with
CONFIG_ARM_LPAE. The patch implements the virtual-to-physical
address translation of 64-bit PTEs used by ARM LPAE kernels.
(sdu.liu(a)huawei.com, weijitao(a)huawei.com)