[Crash-utility] Crash fails to analyse kernel dump from 4.2-rc4

[Dave Anderson]

----- Original Message -----
> Hi all,
> 
> I updated my kernel to 4.2-rc4 but suddenly crash failed to analyse the
> kernel with the following error message:
> ------
> crash: invalid kernel virtual address: 170000001d  type: "possible"
> WARNING: cannot read cpu_possible_map
> crash: invalid kernel virtual address: 3800000046  type: "present"
> WARNING: cannot read cpu_present_map
> crash: invalid kernel virtual address: 240000002d  type: "online"
> WARNING: cannot read cpu_online_map
> crash: invalid kernel virtual address: 570000006e  type: "active"
> WARNING: cannot read cpu_active_map
> crash: cannot determine base kernel version
> crash: /home/adam/linux-btrfs/vmlinux and vmcore do not match!
> ------
> 
> Crash 7.1.0 and 7.1.2 fails with the same error.
> 
> Previously I'm testing 4.2-rc1 kernel and 7.1.0 works like a charm.
> 
> So is there something wrong with the new kernel?
> 
> Thanks,
> Qu

The most recent kernel version I've tested is Fedora's 4.2.0-0.rc4.git1.1.fc23.x86_64,
although I'm not sure how that version correlates with upstream 4.2-rc1.  It is based
upon linux-4.1.tar.xz with a bunch of patches.  Here is a live system session with the
Fedora version of crash:

# crash

crash 7.1.2-1.fc23
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 "x86_64-unknown-linux-gnu"...

      KERNEL: /usr/lib/debug/lib/modules/4.2.0-0.rc4.git1.1.fc23.x86_64/vmlinux
    DUMPFILE: /dev/crash
        CPUS: 160
        DATE: Mon Aug  3 13:00:49 2015
      UPTIME: 03:58:44
LOAD AVERAGE: 0.59, 0.36, 0.17
       TASKS: 1714
    NODENAME: hp-dl980g7-02.rhts.eng.bos.redhat.com
     RELEASE: 4.2.0-0.rc4.git1.1.fc23.x86_64
     VERSION: #1 SMP Tue Jul 28 20:21:39 UTC 2015
     MACHINE: x86_64  (2261 Mhz)
      MEMORY: 1006 GB
         PID: 38013
     COMMAND: "crash"
        TASK: ffff881f668e6400  [THREAD_INFO: ffff881f68ad0000]
         CPU: 61
       STATE: TASK_RUNNING (ACTIVE)

crash> 

Can you run on the live system?  If so, it's most likely an issue with 
the vmcore.

Post the output of "crash -d8 vmlinux vmcore".  The debug output may
yield some clues.

Dave