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[Ming Lei <1460941@xxxxxxxxxxxxxxxxxx>]

Verification on trusty:

ubuntu@am2:~$ sudo crash vmlinux
[sudo] password for ubuntu: 

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.
 
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 Jun 25 21:58:34 2015
      UPTIME: 00:03:29
LOAD AVERAGE: 0.08, 0.03, 0.01
       TASKS: 130
    NODENAME: am2
     RELEASE: 3.13.11-ckt21+
     VERSION: #35 SMP PREEMPT Thu Jun 18 03:19:42 EDT 2015
     MACHINE: aarch64  (unknown Mhz)
      MEMORY: 16 GB
         PID: 1766
     COMMAND: "crash"
        TASK: ffffffc3e79be180  [THREAD_INFO: ffffffc3e3c44000]
         CPU: 3
       STATE: TASK_RUNNING (ACTIVE)

crash> bt -e
PID: 1766   TASK: ffffffc3e79be180  CPU: 5   COMMAND: "crash"
USER-MODE EXCEPTION FRAME AT: ffffffc3e3c47ed0
     PC: 0000007fa68812cc   LR: 000000000047ad2c   SP: 0000007fd2a4c400
    X29: 0000007fd2a4c400  X28: 000000000094b000  X27: 0000000000001000
    X26: 0000007fa67c4710  X25: ffffffc3e3c47000  X24: 0000000000982080
    X23: 00000000009fd488  X22: 0000000000000004  X21: 0000000000001000
    X20: 000000000094b000  X19: 00000043e3c47000  X18: 0000007fd2a4ca60
    X17: 0000007fa68812b0  X16: 0000000000000000  X15: 0000007fa690b590
    X14: 0000000000000000  X13: 0000000000000000  X12: 0000000000000028
    X11: 0000000000000005  X10: 0000000028521830   X9: 0000000000000004
     X8: 000000000000003f   X7: 000000000099a030   X6: 000000000000003f
     X5: 000000000047ac18   X4: 000000000099f9e8   X3: ffffffc3e3c47000
     X2: 0000000000001000   X1: 00000000009fd488   X0: 0000000000000004
    ORIG_X0: 0000000000000004  SYSCALLNO: 3f  PSTATE: 60000000
crash> 
crash> quit
ubuntu@am2:~$ sudo dpkg -l crash
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          7.0.3-3ubunt arm64        kernel debugging utility, allowin

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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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