HP ProLiant DL360p G8
Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz
kernel 4.2.0

Example 1, binutils-2.23.52
----------------------------

# perf test 23 -v
23: Test object code reading                                 :
--- start ---
test child forked, pid 31014
Looking at the vmlinux_path (7 entries long)
Using /lib/modules/4.2.0/build/vmlinux for symbols
Parsing event 'cycles'
mmap size 528384B
<snip>
Reading object code for memory address: 0xffffffffa001c010
File is: /lib/modules/4.2.0/kernel/lib/libcrc32c.ko
On file address is: 0x80
dso open failed: No such file or directory
Objdump command is: objdump -d --start-address=0x10 --stop-address=0x90 /lib/modules/4.2.0/kernel/lib/libcrc32c.ko
objdump read too few bytes
Reducing len to 120
Bytes read differ from those read by objdump
test child finished with -1
---- end ----
Test object code reading: FAILED!

# objdump -d --start-address=0x10 --stop-address=0x90 /lib/modules/4.2.0/kernel/lib/libcrc32c.ko

/lib/modules/4.2.0/kernel/lib/libcrc32c.ko:     file format elf64-x86-64

Disassembly of section .text:

0000000000000010 <crc32c+0x10>:
  10:   8b 01                   mov    (%rcx),%eax
  12:   48 83 c0 26             add    $0x26,%rax
  16:   48 c1 e8 04             shr    $0x4,%rax
  1a:   48 c1 e0 04             shl    $0x4,%rax
  1e:   48 29 c4                sub    %rax,%rsp
  21:   48 8d 5c 24 07          lea    0x7(%rsp),%rbx
  26:   48 c1 eb 03             shr    $0x3,%rbx
  2a:   48 8d 04 dd 00 00 00    lea    0x0(,%rbx,8),%rax
  31:   00
  32:   89 3c dd 10 00 00 00    mov    %edi,0x10(,%rbx,8)
  39:   48 89 0c dd 00 00 00    mov    %rcx,0x0(,%rbx,8)
  40:   00
  41:   c7 04 dd 08 00 00 00    movl   $0x0,0x8(,%rbx,8)
  48:   00 00 00 00
  4c:   48 89 c7                mov    %rax,%rdi
  4f:   e8 00 00 00 00          callq  54 <crc32c+0x54>
  54:   85 c0                   test   %eax,%eax
  56:   75 0d                   jne    65 <crc32c+0x65>
  58:   8b 04 dd 10 00 00 00    mov    0x10(,%rbx,8),%eax
  5f:   48 8b 5d f8             mov    -0x8(%rbp),%rbx
  63:   c9                      leaveq
  64:   c3                      retq
  65:   0f 0b                   ud2
  67:   90                      nop

Disassembly of section .init.text:

0000000000000010 <init_module+0x10>:
  10:   00 00                   add    %al,(%rax)
  12:   00 00                   add    %al,(%rax)
  14:   31 d2                   xor    %edx,%edx
  16:   48 3d 01 f0 ff ff       cmp    $0xfffffffffffff001,%rax
  1c:   48 89 05 00 00 00 00    mov    %rax,0x0(%rip)        # 23 <init_module+0x23>
  23:   0f 43 d0                cmovae %eax,%edx
  26:   89 d0                   mov    %edx,%eax
  28:   5d                      pop    %rbp
  29:   c3                      retq

Disassembly of section .exit.text:

0000000000000010 <cleanup_module+0x10>:
  10:   00 00                   add    %al,(%rax)
  12:   00 00                   add    %al,(%rax)
  14:   5d                      pop    %rbp
  15:   c3                      retq

Example 2, binutils-2.23.52
----------------------------

# perf test 23 -v
23: Test object code reading                                 :
--- start ---
test child forked, pid 34729
Looking at the vmlinux_path (7 entries long)
Using /lib/modules/4.2.0/build/vmlinux for symbols
Parsing event 'cycles'
mmap size 528384B
<snip>
Reading object code for memory address: 0xffffffff816829ac
File is: /lib/modules/4.2.0/build/vmlinux
On file address is: 0x8829ac
Objdump command is: objdump -d --start-address=0xffffffff816829ac --stop-address=0xffffffff81682a2c /lib/modules/4.2.0/build/vmlinux
Bytes read differ from those read by objdump
test child finished with -1
---- end ----
Test object code reading: FAILED!

# objdump -d --start-address=0xffffffff816829ac --stop-address=0xffffffff81682a2c /lib/modules/4.2.0/build/vmlinux

/lib/modules/4.2.0/build/vmlinux:     file format elf64-x86-64

Disassembly of section .text:

ffffffff816829ac <syscall_return_via_sysret+0x2e>:
ffffffff816829ac:       8c 35 00 ff 15 2b       mov    %?,0x2b15ff00(%rip)        # ffffffffac7e28b2 <__brk_limit+0x2a7e38b2>

ffffffff816829af <opportunistic_sysret_failed>:
ffffffff816829af:       ff 15 2b 8c 35 00       callq  *0x358c2b(%rip)        # ffffffff819db5e0 <pv_cpu_ops+0x120>
ffffffff816829b5:       e9 fe 08 00 00          jmpq   ffffffff816832b8 <restore_c_regs_and_iret>
ffffffff816829ba:       66 0f 1f 44 00 00       nopw   0x0(%rax,%rax,1)

ffffffff816829c0 <stub_clone>:
ffffffff816829c0:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff816829c5:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff816829ca:       4c 89 6c 24 18          mov    %r13,0x18(%rsp)
ffffffff816829cf:       4c 89 64 24 20          mov    %r12,0x20(%rsp)
ffffffff816829d4:       48 89 6c 24 28          mov    %rbp,0x28(%rsp)
ffffffff816829d9:       48 89 5c 24 30          mov    %rbx,0x30(%rsp)
ffffffff816829de:       e9 3d e7 9f ff          jmpq   ffffffff81081120 <SyS_clone>
ffffffff816829e3:       66 66 66 66 2e 0f 1f    data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
ffffffff816829ea:       84 00 00 00 00 00

ffffffff816829f0 <stub_fork>:
ffffffff816829f0:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff816829f5:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff816829fa:       4c 89 6c 24 18          mov    %r13,0x18(%rsp)
ffffffff816829ff:       4c 89 64 24 20          mov    %r12,0x20(%rsp)
ffffffff81682a04:       48 89 6c 24 28          mov    %rbp,0x28(%rsp)
ffffffff81682a09:       48 89 5c 24 30          mov    %rbx,0x30(%rsp)
ffffffff81682a0e:       e9 ad e6 9f ff          jmpq   ffffffff810810c0 <sys_fork>
ffffffff81682a13:       66 66 66 66 2e 0f 1f    data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
ffffffff81682a1a:       84 00 00 00 00 00

ffffffff81682a20 <stub_vfork>:
ffffffff81682a20:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff81682a25:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff81682a2a:       4c 89 6c 24 18          mov    %r13,0x18(%rsp)


Example 3, latest objdump from git://sourceware.org/git/binutils-gdb.git
HEAD == 1a91555 Fix seg-fault in readelf when scanniing a corrupt binary.
over same data as previous example
--------------------------------------------------------------------------

# ./binutils/objdump -d --start-address=0xffffffff816829ac --stop-address=0xffffffff81682a2c /lib/modules/4.2.0/build/vmlinux

/lib/modules/4.2.0/build/vmlinux:     file format elf64-x86-64

Disassembly of section .text:

ffffffff816829ac <syscall_return_via_sysret+0x2e>:
ffffffff816829ac:       8c                      .byte 0x8c
ffffffff816829ad:       35                      .byte 0x35
        ...

ffffffff816829af <opportunistic_sysret_failed>:
ffffffff816829af:       ff 15 2b 8c 35 00       callq  *0x358c2b(%rip)        # ffffffff819db5e0 <pv_cpu_ops+0x120>
ffffffff816829b5:       e9 fe 08 00 00          jmpq   ffffffff816832b8 <restore_c_regs_and_iret>
ffffffff816829ba:       66 0f 1f 44 00 00       nopw   0x0(%rax,%rax,1)

ffffffff816829c0 <stub_clone>:
ffffffff816829c0:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff816829c5:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff816829ca:       4c 89 6c 24 18          mov    %r13,0x18(%rsp)
ffffffff816829cf:       4c 89 64 24 20          mov    %r12,0x20(%rsp)
ffffffff816829d4:       48 89 6c 24 28          mov    %rbp,0x28(%rsp)
ffffffff816829d9:       48 89 5c 24 30          mov    %rbx,0x30(%rsp)
ffffffff816829de:       e9 3d e7 9f ff          jmpq   ffffffff81081120 <SyS_clone>
ffffffff816829e3:       66 66 66 66 2e 0f 1f    data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
ffffffff816829ea:       84 00 00 00 00 00

ffffffff816829f0 <stub_fork>:
ffffffff816829f0:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff816829f5:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff816829fa:       4c 89 6c 24 18          mov    %r13,0x18(%rsp)
ffffffff816829ff:       4c 89 64 24 20          mov    %r12,0x20(%rsp)
ffffffff81682a04:       48 89 6c 24 28          mov    %rbp,0x28(%rsp)
ffffffff81682a09:       48 89 5c 24 30          mov    %rbx,0x30(%rsp)
ffffffff81682a0e:       e9 ad e6 9f ff          jmpq   ffffffff810810c0 <sys_fork>
ffffffff81682a13:       66 66 66 66 2e 0f 1f    data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
ffffffff81682a1a:       84 00 00 00 00 00

ffffffff81682a20 <stub_vfork>:
ffffffff81682a20:       4c 89 7c 24 08          mov    %r15,0x8(%rsp)
ffffffff81682a25:       4c 89 74 24 10          mov    %r14,0x10(%rsp)
ffffffff81682a2a:       4c                      rex.WR
ffffffff81682a2b:       89                      .byte 0x89