[Crash-utility] [PATCH]fix kmem -s(slab) to support Linux 3.7 and later

[qiaonuohan]

At 2013-3-16 1:47, Dave Anderson wrote:
> The patch tested OK, and is queued for crash-6.1.5.
>
> But can you please give me an example of the "kmem -s" error so that I
> can put it in the crash.changelog?
>

Hi Dave,

The following is initial information. Crash fails to initialize slab.

<cut>
[root at localhost crash-6.1.4]# ./crash

crash 6.1.4
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) 7.3.1
Copyright (C) 2011 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"...

crash: read error: kernel virtual address: ffffffff8160edc0  type: 
"cpu_possible_mask"

crash: this kernel may be configured with CONFIG_STRICT_DEVMEM, which
        renders /dev/mem unusable as a live memory source.

crash: trying /proc/kcore as an alternative to /dev/mem

crash: invalid kernel virtual address: e860000000000e04  type: "array 
cache limit"
crash: unable to initialize kmem slab cache subsystem

       KERNEL: /usr/lib/debug/lib/modules/3.8.0/vmlinux
     DUMPFILE: /proc/kcore
         CPUS: 2
         DATE: Thu Mar 14 15:22:33 2013
       UPTIME: 03:35:12
LOAD AVERAGE: 0.08, 0.03, 0.05
        TASKS: 186
     NODENAME: localhost.localdomain
      RELEASE: 3.8.0
      VERSION: #1 SMP Mon Mar 11 14:57:49 CST 2013
      MACHINE: x86_64  (2926 Mhz)
       MEMORY: 1.2 GB
          PID: 5225
      COMMAND: "crash"
         TASK: ffff88003762a0c0  [THREAD_INFO: ffff880037a5c000]
          CPU: 1
        STATE: TASK_RUNNING (ACTIVE)

crash>
<cut>

And when using kmem -s command, crash shows,
<cut>
crash> kmem -s
kmem: kmem cache slab subsystem not available
crash>
<cut>

-- 
--
Regards
Qiao Nuohan