[Crash-utility] [ANNOUNCE] crash 7.0.7 is available

[Dave Anderson]

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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at redhat.com, bud.brown at 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 at 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 at 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 at redhat.com)

 - Implemented a new "ps -S" option that displays a summary consisting
   of the number of tasks in a task state.
   (anderson at 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 at 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 at redhat.com, anatol.pomozov at 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 at 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 at 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 at 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 at 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 at 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 at 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 at 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 at huawei.com, weijitao at huawei.com)