Access violation

[opc0de]

I have an event in OnSms Received witch causes sometimes an access violation in TnrPduSms.GetPhone. Here is the error log :
This error ocurrs after 50 - 70 sms received.

Code Select Expand



date/time         : 2012-06-05, 09:04:12, 254ms
computer name     : OPC0DE-PC
user name         : opc0de <admin>
registered owner  : opc0de
operating system  : Windows 7 x64 Service Pack 1 build 7601
system language   : English
system up time    : 3 days 23 hours
program up time   : 15 hours 16 minutes
processors        : 2x Pentium(R) Dual-Core CPU E5700 @ 3.00GHz
physical memory   : 1664/4061 MB (free/total)
free disk space   : (C:) 60.82 GB (D:) 99.52 GB
display mode      : 1360x768, 32 bit
process id        : $1728
allocated memory  : 39.12 MB
executable        : SmsGateway.exe
exec. date/time   : 2012-06-04 17:48
version           : 1.0.0.0
compiled with     : Delphi XE2
madExcept version : 3.0n
callstack crc     : $50107c82, $fd99a1b9, $43a92ff4
count             : 2
exception number  : 1
exception class   : EAccessViolation
exception message : Access violation at address 005A7CAA in module 'SmsGateway.exe'. Read of address 00000004.

thread $178 (TSmsThread):
005a7caa +012 SmsGateway.exe nrgsmpdu        643  +1 TnrPduSms.GetPhone
007d2766 +072 SmsGateway.exe uMain           140  +3 TForm1.gsmSmsReceived
005aee50 +14c SmsGateway.exe nrgsm          1418 +30 TnrGsm.DoProcessNotifySms
005ab5bd +035 SmsGateway.exe nrgsm           500  +3 TSmsThread.DoSynchroEvent
005ab5d2 +00a SmsGateway.exe nrgsm           506  +2 TSmsThread.Execute
004b6bcf +02b SmsGateway.exe madExcept               HookedTThreadExecute
00480eca +042 SmsGateway.exe System.Classes          ThreadProc
00407cf0 +028 SmsGateway.exe System          928  +0 ThreadWrapper
004b6ab1 +00d SmsGateway.exe madExcept               CallThreadProcSafe
004b6b1b +037 SmsGateway.exe madExcept               ThreadExceptFrame
75773398 +010 kernel32.dll                           BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +05a SmsGateway.exe System          928  +0 BeginThread

main thread ($c7c):
7547f5b7 +00e USER32.dll                      WaitMessage
0058de1d +149 SmsGateway.exe Vcl.Forms        TApplication.Idle
0058d043 +017 SmsGateway.exe Vcl.Forms        TApplication.HandleMessage
0058d369 +0c9 SmsGateway.exe Vcl.Forms        TApplication.Run
007e20b7 +03b SmsGateway.exe SmsGateway 17 +3 initialization
75773398 +010 kernel32.dll                    BaseThreadInitThunk

thread $1798:
77aa0136 +0e ntdll.dll     NtWaitForMultipleObjects
75773398 +10 kernel32.dll  BaseThreadInitThunk

thread $748 (TMsgThread):
75457908 +26 USER32.dll                           GetMessageW
0059ef0e +b6 SmsGateway.exe nrcomm         416 +3 TMsgThread.Execute
004b6bcf +2b SmsGateway.exe madExcept             HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes        ThreadProc
00407cf0 +28 SmsGateway.exe System         928 +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept             CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept             ThreadExceptFrame
75773398 +10 kernel32.dll                         BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928 +0 BeginThread

thread $16b8 (TCommThread):
77a9f8aa +0e ntdll.dll                             NtWaitForSingleObject
759c0a8b +92 KERNELBASE.dll                        WaitForSingleObjectEx
7577118f +3e kernel32.dll                          WaitForSingleObjectEx
75771143 +0d kernel32.dll                          WaitForSingleObject
0059ed11 +75 SmsGateway.exe nrcomm         359 +12 TCommThread.Execute
004b6bcf +2b SmsGateway.exe madExcept              HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes         ThreadProc
00407cf0 +28 SmsGateway.exe System         928  +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept              CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept              ThreadExceptFrame
75773398 +10 kernel32.dll                          BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928  +0 BeginThread

thread $eac (TMsgThread):
75457908 +26 USER32.dll                           GetMessageW
0059ef0e +b6 SmsGateway.exe nrcomm         416 +3 TMsgThread.Execute
004b6bcf +2b SmsGateway.exe madExcept             HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes        ThreadProc
00407cf0 +28 SmsGateway.exe System         928 +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept             CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept             ThreadExceptFrame
75773398 +10 kernel32.dll                         BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928 +0 BeginThread

thread $1754 (TCommThread):
77a9f8aa +0e ntdll.dll                             NtWaitForSingleObject
759c0a8b +92 KERNELBASE.dll                        WaitForSingleObjectEx
7577118f +3e kernel32.dll                          WaitForSingleObjectEx
75771143 +0d kernel32.dll                          WaitForSingleObject
0059ed11 +75 SmsGateway.exe nrcomm         359 +12 TCommThread.Execute
004b6bcf +2b SmsGateway.exe madExcept              HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes         ThreadProc
00407cf0 +28 SmsGateway.exe System         928  +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept              CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept              ThreadExceptFrame
75773398 +10 kernel32.dll                          BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928  +0 BeginThread

thread $6b8 (TMsgThread):
75457908 +26 USER32.dll                           GetMessageW
0059ef0e +b6 SmsGateway.exe nrcomm         416 +3 TMsgThread.Execute
004b6bcf +2b SmsGateway.exe madExcept             HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes        ThreadProc
00407cf0 +28 SmsGateway.exe System         928 +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept             CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept             ThreadExceptFrame
75773398 +10 kernel32.dll                         BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928 +0 BeginThread

thread $8b0 (TCommThread):
77a9f8aa +0e ntdll.dll                             NtWaitForSingleObject
759c0a8b +92 KERNELBASE.dll                        WaitForSingleObjectEx
7577118f +3e kernel32.dll                          WaitForSingleObjectEx
75771143 +0d kernel32.dll                          WaitForSingleObject
0059ed11 +75 SmsGateway.exe nrcomm         359 +12 TCommThread.Execute
004b6bcf +2b SmsGateway.exe madExcept              HookedTThreadExecute
00480eca +42 SmsGateway.exe System.Classes         ThreadProc
00407cf0 +28 SmsGateway.exe System         928  +0 ThreadWrapper
004b6ab1 +0d SmsGateway.exe madExcept              CallThreadProcSafe
004b6b1b +37 SmsGateway.exe madExcept              ThreadExceptFrame
75773398 +10 kernel32.dll                          BaseThreadInitThunk
>> created by main thread ($c7c) at:
00407d5a +5a SmsGateway.exe System         928  +0 BeginThread

thread $1724:
77aa1f1f +0b ntdll.dll     NtWaitForWorkViaWorkerFactory
75773398 +10 kernel32.dll  BaseThreadInitThunk


cpu registers:
eax = 03f5fdfc
ebx = 049a5e80
ecx = fffffffe
edx = 00000000
esi = 023313a0
edi = 00000000
eip = 005a7caa
esp = 03f5fd48
ebp = 03f5fd50

stack dump:
03f5fd48  fc fd f5 03 00 00 00 00 - 60 fe f5 03 6b 27 7d 00  ........`...k'}.
03f5fd58  20 30 7d 00 70 fe f5 03 - 18 74 40 00 60 fe f5 03  .0}.p....t@.`...
03f5fd68  80 5e 9a 04 00 00 00 00 - 00 00 00 00 00 00 00 00  .^..............
03f5fd78  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fd88  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fd98  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fda8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fdb8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fdc8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fdd8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fde8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fdf8  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fe08  80 5e 9a 04 00 00 00 00 - 00 00 00 00 00 00 00 00  .^..............
03f5fe18  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fe28  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fe38  00 00 00 00 00 00 00 00 - 00 00 00 00 d0 c2 34 02  ..............4.
03f5fe48  00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00  ................
03f5fe58  00 00 00 00 10 42 9e 04 - b4 fe f5 03 56 ee 5a 00  .....B......V.Z.
03f5fe68  00 00 00 00 32 00 00 00 - d4 fe f5 03 18 74 40 00  ....2........t@.
03f5fe78  b4 fe f5 03 c8 b5 5a 00 - 2c d4 a4 04 11 00 00 00  ......Z.,.......

disassembling:
[...]
005a7c9b       add     esp, -8
005a7c9e       mov     [ebp-8], edx
005a7ca1       mov     [ebp-4], eax
005a7ca4 643   mov     eax, [ebp-8]
005a7ca7       mov     edx, [ebp-4]
005a7caa     > mov     edx, [edx+4]
005a7cad       call    -$19fa8e ($408224)     ; System.@UStrAsg
005a7cb2 644   pop     ecx
005a7cb3       pop     ecx
005a7cb4       pop     ebp
005a7cb5       ret


[chinachengxinyong]

you need past source code on here then our roman can help you.we can learn from his suggestion