[Crash-utility] [ANNOUNCE] crash version 5.1.5 is available

[Dave Anderson]

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

 Changelog:

  - Fix to allow a vmlinux.bz2 file to be accepted when it is part of
    a relative or absolute pathname.  Without the patch, the file is
    rejected with the message "crash: <path-to>/vmlinux.bz2: not a 
    supported file format", although it is still possible to use it with
    the "-f" flag.
    (d.hatayama at jp.fujitsu.com)
 
  - Fix for the usage of a vmlinux.gz or vmlinux.bz2 file if the 
    relevant gunzip or bunzip2 file is not located in /usr/bin.
    Without the patch on an Ubunutu system, the uncompression fails
    because those binaries are only located in the /bin directory.
    Also fixed the uncompression error message to differentiate 
    between gunzip and bunzip2.
    (anderson at redhat.com)
 
  - Created a new exist_regs_in_elf_notes() function for extension
    modules to pre-determine whether an ELF note containing registers
    exists for a specified task.  The function is also used by the
    currently-existing get_regs_from_elf_notes() function to clean up 
    redundant code in the various get_<arch>_regs_from_elf_notes() 
    functions that it calls.
    (d.hatayama at jp.fujitsu.com)
 
  - Exported the formerly static x86_64_exception_frame() function
    to extension modules, and created a new EFRAME_INIT flags argument
    that directs the function to fill in the x86_64 pt_regs offset table
    and return any errors encountered in doing so.
    (anderson at redhat.com)
 
  - Created and exported a new get_kvm_register_set() interface for 
    extension modules to get a copy of the per-cpu registers stored in 
    the kvmdump header.
    (anderson at redhat.com)
 
  - Fix for the handling of x86_64 compressed kdump dumpfiles where 
    the crashing system contained more than 454 cpus.  Without the
    patch, the crash session fails during initialization with the error
    message "crash: compressed kdump: invalid nr_cpus value: <cpus>"
    followed by "crash: vmcore: not a supported file format".
    (tindoh at redhat.com, tachibana at mxm.nes.nec.co.jp)
 
  - Fix for the "uvtop" and "vm -p" commands when run on tasks that
    have performed an mprotect(PROT_NONE) on a user-space page.  Because
    the PAGE_PRESENT bit is not set in that case, the page was presumed 
    to be swapped out.  Without the patch the "vtop <address>" command 
    fails with the error message "vtop: cannot determine swap location", 
    and "vm -p" indicates "SWAP: (unknown swap location)" when iterating
    over the page.
    (d.hatayama at jp.fujitsu.com)
 
  - Fix for the use of the "-g vmlinux" command line option by non-root 
    users if the /dev/crash module has been preloaded.  Without the
    patch, after the vmlinux file's debugging information has been 
    shown, the error messages "ERROR: Removing 'crash': Operation not 
    permitted" and "NOTE: cleanup_memory_driver failed" are displayed.
    (anderson at redhat.com)
 
  - Fix for the s390x "bt" command to handle a program check interrupt
    while operating on the process stack.  Without the patch, the 
    backtrace stops prematurely upon reaching the pgm_check_handler() 
    interrupt handler.
    (holzheu at linux.vnet.ibm.com)
  
  - Long overdue rewrite of the crash.8 man page and the associated
    "crash -h" built-in usage display.  The crash.8 man page clarifies
    the required invocation options, adds all of the rarely-used 
    command line options that have proliferated over the years, and
    updates the ENVIRONMENT variables section.  The "crash -h" output 
    closely mimics the relevant parts of the crash.8 man page.
    (anderson at redhat.com)
 
  - Fix for the embedded gdb module to determine member offsets of the 
    pglist_data structure when the kernel was compiled with gcc 4.6.0.
    Without the patch, the system MEMORY size shown by the initial system
    data and by the "sys" command is nonsensical, the "kmem -n" command 
    shows faulty memory node data, and if the kernel is configure with 
    CONFIG_SLUB, "kmem -[sS]" will fail with numerous "kmem: page_to_nid:
    cannot determine node for pages: <page-address>" errors.  There 
    may be other ramifications given that the pglist_data structure is 
    crucial to the functionality of the crash utility.  
    (tromey at redhat.com)
 
  - Implemented the capability of using the NT_PRSTATUS ELF note data 
    that is saved in version 4 compressed kdump headers to determine the 
    starting stack and instruction pointer hooks for x86 and x86_64 
    backtraces when they cannot be determined in the traditional manners.
    (wang.chao at cn.fujitsu.com, wency at cn.fujitsu.com)
 
  - Added a new "--osrelease <dumpfile>" command line option that 
    displays the OSRELEASE vmcoreinfo string from a kdump dumpfile.
    (anderson at redhat.com)
 
  - Fix to recognize the per-cpu symbol name change from "cpu_info"
    to "ia64_cpu_info" in 2.6.33 and later ia64 kernels.  Without the 
    patch, the message "WARNING: cannot find cpuinfo_ia64 location" 
    would appear during invocation, and the "mach -c" command would 
    fail in a similar manner, indicating "mach: cannot find cpuinfo_ia64
    location". 
    (anderson at redhat.com)
 
  - Fix for "kmem -[sS]" command on 2.6.39 kernels where the original 
    slab structure members have been moved into an anonymous union.
    Without the patch, either command fails immediately with the error
    message "kmem: invalid structure member offset: slab_list".
    (anderson at redhat.com)