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[Ming Lei <1460941@xxxxxxxxxxxxxxxxxx>]

verification on vivid:
ubuntu@ubuntu:~/test$ sudo dpkg -l crash
sudo: unable to resolve host ubuntu
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  crash          7.0.8-1ubunt arm64        kernel debugging utility, allowin
ubuntu@ubuntu:~/test$ ls
Image  linux1.tar.xz  loop	  ubuntu   vm-test
linux  linux.tar.xz   System.map  vmlinux
ubuntu@ubuntu:~/test$ sudo crash vmlinux
sudo: unable to resolve host ubuntu

crash 7.0.8
Copyright (C) 2002-2014  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.  Enter "help copying" to see the conditions.
This program has absolutely no warranty.  Enter "help warranty" for details.
 
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-unknown-linux-gnu"...

      KERNEL: vmlinux
    DUMPFILE: /dev/mem
        CPUS: 8
        DATE: Thu Jan  1 00:00:00 1970
      UPTIME: 00:01:50
LOAD AVERAGE: 0.30, 0.10, 0.04
       TASKS: 142
    NODENAME: ubuntu
     RELEASE: 3.19.8-ckt1+
     VERSION: #39 SMP PREEMPT Thu Jun 25 04:41:15 EDT 2015
     MACHINE: aarch64  (unknown Mhz)
      MEMORY: 16 GB
         PID: 2017
     COMMAND: "crash"
        TASK: ffffffc3ccae5600  [THREAD_INFO: ffffffc0fd1a8000]
         CPU: 0
       STATE: TASK_RUNNING (ACTIVE)

crash> bt -e
PID: 2017   TASK: ffffffc3ccae5600  CPU: 2   COMMAND: "crash"
USER-MODE EXCEPTION FRAME AT: ffffffc0fd1abed0
     PC: 0000007fa3a2ca78   LR: 000000000047daa0   SP: 0000007fcb803950
    X29: 0000007fcb803950  X28: 000000000096e000  X27: 00000000007f1000
    X26: 00000000007f75a8  X25: ffffffc0fd1ab000  X24: 0000000000a205f0
    X23: 0000000000000004  X22: 0000000000001000  X21: 000000000096e000
    X20: 00000040fd1ab000  X19: 00000000009a5180  X18: 0000000000000000
    X17: 0000007fa3a2ca90  X16: 0000000000000000  X15: ffffffffffffffff
    X14: 0000000000000000  X13: 0000000000000000  X12: 0000000000000028
    X11: 0101010101010101  X10: 7f7f7f7f7f7f7fff   X9: 0000000000000004
     X8: 000000000000003f   X7: 0000000000000000   X6: 0000007fa3c18710
     X5: 000000000047d970   X4: 00000040fd1ab000   X3: ffffffc0fd1ab000
     X2: 0000000000001000   X1: 0000000000a205f0   X0: 0000000000000004
    ORIG_X0: 0000000000000004  SYSCALLNO: 3f  PSTATE: 00000000
crash>

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https://bugs.launchpad.net/bugs/1460941

Title:
  arm64: crash: invalid/unsupported page size: 6144

Status in crash package in Ubuntu:
  Fix Released
Status in crash source package in Trusty:
  Fix Committed
Status in crash source package in Utopic:
  Fix Committed
Status in crash source package in Vivid:
  Fix Committed
Status in crash source package in Wily:
  Fix Released

Bug description:
  [Impact]

  crash in ARM64 can't be used on ubuntu trusty, utopic and vivid when
  debugging a new kernel like 4.1-rc+

  [Test Case]

  sudo crash ~/vmlinux
  crash will exit with failure log of 'crash: invalid/unknown page size: 
  6144', see detailed steps in [1].

  [Regression Potential]

  The proposed patch has been merged upstream, so there shouldn't be
  potential regression.

  Also These changes are to code that only gets compiled on arm64, so
  there's no risk to other architectures.

  [Other Info]

  After running crash from trusty, the failure log in [1] can be
  observed.

  Then I built crash from wily directly, the similar failure[2] can be
  observed too.

  [1] failure log
  ubuntu@am2:~/git/crash-wily$ sudo crash ~/vmlinux

  crash 7.0.3
  Copyright (C) 2002-2013  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.

  crash: invalid/unknown page size: 6144

  [2]
  ubuntu@am2:~/git/crash-wily$ sudo ./crash ~/vmlinux
  [sudo] password for ubuntu:

  crash 7.0.8
  Copyright (C) 2002-2014  Red Hat, Inc.
  Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
  Copyright (C) 1999-2006  Hewlett-Packard Co
  Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
  Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
  Copyright (C) 2005, 2011  NEC Corporation
  Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
  Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
  This program is free software, covered by the GNU General Public License,
  and you are welcome to change it and/or distribute copies of it under
  certain conditions.  Enter "help copying" to see the conditions.
  This program has absolutely no warranty.  Enter "help warranty" for details.

  crash: invalid/unsupported page size: 6144

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