[Crash-utility] crash warnings

[Badari Pulavarty]

On Thu, 2006-04-27 at 12:21 -0400, Dave Anderson wrote:
> Badari,
> 
> What happens when you disassemble sys_read() on a live
> system running that particular kernel?  Use "dis sys_read" as the
> crash command.
> 
> Thanks,
>    Dave


Dave,

crash shows wrong dis-assembly for even live machine...

Thanks,
Badari


elm3a242:~/crash-4.0-2.23 # ./crash /usr/src/linux/vmlinux

crash 4.0-2.23
Copyright (C) 2002, 2003, 2004, 2005, 2006  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005  Fujitsu Limited
Copyright (C) 2005  NEC Corporation
Copyright (C) 1999, 2002  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public
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certain conditions.  Enter "help copying" to see the conditions.
This program has absolutely no warranty.  Enter "help warranty" for
details.

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This GDB was configured as "x86_64-unknown-linux-gnu"...

  SYSTEM MAP: /usr/src/linux/System.map
DEBUG KERNEL: /usr/src/linux/vmlinux (2.6.16-20-smp)
    DUMPFILE: /dev/mem
        CPUS: 2
        DATE: Thu Apr 27 02:06:52 2006
      UPTIME: 16:29:16
LOAD AVERAGE: 0.07, 0.02, 0.00
       TASKS: 64
    NODENAME: elm3a242
     RELEASE: 2.6.16-20-smp
     VERSION: #1 SMP Mon Apr 10 04:51:13 UTC 2006
     MACHINE: x86_64  (3000 Mhz)
      MEMORY: 4.6 GB
         PID: 12798
     COMMAND: "crash"
        TASK: ffff8101235e37d0  [THREAD_INFO: ffff810118742000]
         CPU: 0
       STATE: TASK_RUNNING (ACTIVE)

crash> dis sys_read
0xffffffff8017b991 <sys_read>:  add    %cl,0xffffffffffffff83(%rax)
0xffffffff8017b994 <sys_read+3>:        (bad)
0xffffffff8017b995 <sys_read+4>:        sbb    %cl,0xffffffffffffff89(%
rax)
0xffffffff8017b998 <sys_read+7>:        callq  0xffffffffdc5916f8
0xffffffff8017b99d <sys_read+12>:       pop    %r13
0xffffffff8017b99f <sys_read+14>:       retq
0xffffffff8017b9a0 <sys_read+15>:
    mov    1862306(%rip),%eax        # 0xffffffff80342448 <files_stat+8>
0xffffffff8017b9a6 <sys_read+21>:       retq
0xffffffff8017b9a7 <sys_read+22>:       push   %rbx
0xffffffff8017b9a8 <sys_read+23>:       cmp    %rdi,(%rdi)
0xffffffff8017b9ab <sys_read+26>:       mov    %rdi,%rbx
0xffffffff8017b9ae <sys_read+29>:       je     0xffffffff8017b9db
<sys_read+74>
0xffffffff8017b9b0 <sys_read+31>:       mov    $0xffffffff80456b80,%rdi
0xffffffff8017b9b7 <sys_read+38>:
    callq  0xffffffff802d0aad <__down_interruptible+75>
0xffffffff8017b9bc <sys_read+43>:       mov    (%rbx),%rdx
0xffffffff8017b9bf <sys_read+46>:       mov    0x8(%rbx),%rax
0xffffffff8017b9c3 <sys_read+50>:       mov    %rax,0x8(%rdx)
0xffffffff8017b9c7 <sys_read+54>:       mov    %rdx,(%rax)
0xffffffff8017b9ca <sys_read+57>:       mov    %rbx,0x8(%rbx)
0xffffffff8017b9ce <sys_read+61>:       mov    %rbx,(%rbx)
0xffffffff8017b9d1 <sys_read+64>: