source insight另一个coredump

系统：windows xp sp3

崩溃的exe：insight3_en.exe

版本：3.50.0064

崩溃时的信息：

The stored exception information can be accessed via .ecxr.
(5404.5050): Access violation - code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=7c930323 edx=00000100 esi=00440b6b edi=0006f324
eip=004eb2a8 esp=0006f0f4 ebp=0006f0f4 iopl=0         nv up ei pl nz na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000206
*** ERROR: Module load completed but symbols could not be loaded for Insight3_en.exe
Insight3_en+0xeb2a8:
004eb2a8 8b00            mov     eax,dword ptr [eax]  ds:0023:00000000=????????

堆栈：

0:000> kb
ChildEBP RetAddr  Args to Child
WARNING: Stack unwind information not available. Following frames may be wrong.
0006f0f4 0044497a 00000000 0000000c 0006f17c Insight3_en+0xeb2a8
0006f104 004438c0 77d4f980 000f084a 000a0acc Insight3_en+0x4497a
0006f17c 00441160 000f084a 00000116 772011ff Insight3_en+0x438c0
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for user32.dll -
0006f2bc 77d18734 000f084a 00000116 00010bcd Insight3_en+0x41160
0006f2e8 77d18816 00440b6b 000f084a 00000116 user32!GetDC+0x6d
0006f350 77d28ea0 00000000 00440b6b 000f084a user32!GetDC+0x14f
0006f3a4 77d28eec 0185a660 00000116 00010bcd user32!DefWindowProcW+0x180
0006f3cc 7c92e473 0006f3dc 00000018 0185a660 user32!DefWindowProcW+0x1cc
0006f444 77d2c228 000f084a 00000313 00000000 ntdll!KiUserCallbackDispatcher+0x13
0006f460 77d2c1d5 000f084a 00000313 00000000 user32!DefWindowProcA+0xaa
0006f4a8 77d3e56d 000f084a 00000313 00000000 user32!DefWindowProcA+0x57
0006f4c0 77d308e6 0185a660 00000313 00000000 user32!EnumClipboardFormats+0x30
0006f528 77d4f980 000f084a 000a0acc 00000313 user32!DefFrameProcW+0xb3
0006f548 0042e3dc 000f084a 000a0acc 00000313 user32!DefFrameProcA+0x1b
0006f574 0044135d 000f084a 000a0acc 00000313 Insight3_en+0x2e3dc
0006f6c4 77d18734 000f084a 00000313 00000000 Insight3_en+0x4135d
0006f6f0 77d18816 00440b6b 000f084a 00000313 user32!GetDC+0x6d
0006f758 77d28ea0 00000000 00440b6b 000f084a user32!GetDC+0x14f
0006f7ac 77d28eec 0185a660 00000313 00000000 user32!DefWindowProcW+0x180
0006f7d4 7c92e473 0006f7e4 00000018 0185a660 user32!DefWindowProcW+0x1cc

看一下004eb2a8的汇编：

.text:004EB29B sub_4EB29B      proc near               ; CODE XREF: sub_44485A+11Bp
.text:004EB29B                                         ; sub_4E7724+1Dp ...
.text:004EB29B
.text:004EB29B arg_0           = dword ptr  8
.text:004EB29B
.text:004EB29B                 push    ebp
.text:004EB29C                 mov     ebp, esp
.text:004EB29E                 mov     eax, [ebp+arg_0]
.text:004EB2A1                 mov     eax, dword_5C6B80[eax*4]
.text:004EB2A8                 mov     eax, [eax]
.text:004EB2AA                 mov     eax, [eax+1Ch]
.text:004EB2AD                 shr     eax, 1
.text:004EB2AF                 and     eax, 1
.text:004EB2B2                 neg     eax
.text:004EB2B4                 sbb     eax, eax
.text:004EB2B6                 inc     eax
.text:004EB2B7                 pop     ebp
.text:004EB2B8                 retn    4
.text:004EB2B8 sub_4EB29B      endp

看到dword_5C6B80这个全局变量非常眼熟，和

source insight coredump分析

里的一样的。

且这个全局变量的内容和index（即arg_0）如下：

0:000> dd 5C6B80 L 1
005c6b80  00000000
0:000> dd ebp+8 L 1
0006f0fc  00000000

这样定位过程就和

source insight coredump分析

完全一样了。