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| Author |
Dr. Watson "Access violoation" error
|
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| Paul fpvt2 2005-05-09, 3:56 pm |
| I have a VB 6 application that uses TCP control to receives request from user
and send strings to users. Users login and logout of the appl. often.
Everytime after running the appl. for about 2 hours, the appl. just
dies/terminates. I found out I got a Dr. Watson error (access violation)
like the following:
Application exception occurred:
App: (pid=336)
When: 5/9/2005 @ 10:43:56.154
Exception number: c0000005 (access violation)
*----> System Information <----*
Number of Processors: 2
Processor Type: x86 Family 6 Model 7 Stepping 3
Windows 2000 Version: 5.0
Current Build: 2195
Service Pack: 4
Current Type: Multiprocessor Free
*----> Task List <----*
336 BD.exe
:
State Dump for Thread Id 0x6bc
function: <nosymbols>
*----> Stack Back Trace <----*
FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
0012F3B4 6C3EBE0A 6C41DC10 00000000 0102FF40 0102C8CC <nosymbols>
0012F3CC 6C3FA994 6C41DC10 0012F458 01223A18 00000001 !Ordinal3258
779DB790 0000C766 0004C200 90909090 748B5653 66570C24 !Ordinal3237
*----> Raw Stack Dump <----*
0012f3b8 0a be 3e 6c 10 dc 41 6c - 00 00 00 00 40 ff 02 01 ..>l..Al....@...
0012f3c8 cc c8 02 01 90 b7 9d 77 - 94 a9 3f 6c 10 dc 41 6c .......w..?l..Al
0012f3d8 58 f4 12 00 18 3a 22 01 - 01 00 00 00 58 f4 12 00 X....:".....X...
0012f3e8 cc c8 02 01 40 f4 12 00 - 48 f6 12 00 c8 f8 12 00 ....@...H.......
0012f3f8 58 4f 22 01 00 00 00 00 - ab 8e 52 73 00 85 22 01 XO".......Rs..".
0012f408 00 00 00 00 58 f4 12 00 - 00 00 00 00 00 f9 12 00 ....X...........
0012f418 8c f9 12 00 01 00 00 00 - 30 f4 12 00 28 60 38 01 ........0...(`8.
0012f428 07 00 00 00 00 f9 12 00 - 00 00 00 00 00 00 00 00 ................
0012f438 00 00 00 00 00 00 00 00 - 68 f4 12 00 86 8f 52 73 ........h.....Rs
0012f448 48 f6 12 00 58 f4 12 00 - 8c f9 12 00 01 00 00 00 H...X...........
0012f458 09 00 00 00 00 00 00 00 - 7a 12 52 73 84 f4 12 00 ........z.Rs....
0012f468 84 f4 12 00 37 90 52 73 - 48 f6 12 00 80 f4 12 00 ....7.RsH.......
0012f478 8c f9 12 00 01 00 00 00 - 00 00 00 00 e8 f8 12 00 ................
0012f488 f2 9f 40 00 28 4b 40 00 - 48 f6 12 00 b8 f8 12 00 ..@.(K@.H.......
0012f498 00 f9 12 00 8c f9 12 00 - 01 00 00 00 00 00 00 00 ................
0012f4a8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
0012f4b8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
0012f4c8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
0012f4d8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
0012f4e8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
State Dump for Thread Id 0x6c8
eax=00000001 ebx=0014ad20 ecx=00000000 edx=00000000 esi=74fea3a0 edi=00000000
eip=77f8289c esp=0136ff84 ebp=0136ffb4 iopl=0 nv up ei pl nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000202
function: ZwRemoveIoCompletion
77f82891 b8a8000000 mov eax,0xa8
77f82896 8d542404 lea edx,[esp+0x4]
ss:01b89e6b=????????
77f8289a cd2e int 2e
77f8289c c21400 ret 0x14
*----> Stack Back Trace <----*
FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
0136FFB4 7C57B388 74FDA57D 0000075E 00010000 0014AD20
ntdll!ZwRemoveIoCompletion
0136FFEC 00000000 74FD6311 0014AD20 00000000 00000008 kernel32!lstrcmpiW
*----> Raw Stack Dump <----*
0136ff84 63 63 fd 74 20 01 00 00 - bc ff 36 01 b0 ff 36 01 cc.t .....6...6.
0136ff94 a4 ff 36 01 08 64 fd 74 - 5e 07 00 00 00 00 01 00 ..6..d.t^.......
0136ffa4 00 00 00 00 1c 00 00 00 - 00 00 fd 74 08 f0 23 01 ...........t..#.
0136ffb4 ec ff 36 01 88 b3 57 7c - 7d a5 fd 74 5e 07 00 00 ..6...W|}..t^...
0136ffc4 00 00 01 00 20 ad 14 00 - 00 d0 fd 7f 0a 00 00 00 .... ...........
0136ffd4 c0 ff 36 01 0a 00 00 00 - ff ff ff ff 44 1f 5c 7c ..6.........D.\|
0136ffe4 08 2b 57 7c 00 00 00 00 - 00 00 00 00 00 00 00 00 .+W|............
0136fff4 11 63 fd 74 20 ad 14 00 - 00 00 00 00 08 00 00 00 .c.t ...........
01370004 01 01 00 00 ee ff ee ff - 00 00 00 00 00 00 02 01 ................
01370014 00 a0 0d 00 00 00 37 01 - 00 01 00 00 40 00 37 01 ......7.....@.7.
01370024 00 00 47 01 da 00 00 00 - 01 00 00 00 98 05 02 01 ..G.............
01370034 00 00 00 00 d0 3c 39 01 - 00 00 00 00 83 10 08 00 .....<9.........
01370044 01 01 08 00 00 00 00 00 - 01 00 00 00 b5 01 00 00 ................
01370054 00 02 00 00 44 31 39 32 - 35 7c 38 30 31 7c 4e 51 ....DDDDD|111|NQ
01370064 4d 35 2c 4e 51 4d 35 2c - 5a 42 4d 35 2c 5a 42 4d M5,NQM5,ZBM5,ZBM
01370074 35 2c 5a 42 4d 35 2c 5a - 42 4d 35 2c 5a 42 4d 35 5,ZBM5,ZBM5,ZBM5
01370084 2c 5a 42 4d 35 2c 5a 42 - 4d 35 2c 5a 42 4d 35 2c ,ZBM5,ZBM5,ZBM5,
01370094 5a 42 4d 35 2c 5a 42 4d - 35 2c 5a 42 4d 35 2c 5a ZBM5,ZBM5,ZBM5,Z
013700a4 42 4d 35 2c 5a 42 4d 35 - 2c 5a 42 4d 35 2c 5a 42 BM5,ZBM5,ZBM5,ZB
013700b4 4d 35 2c 5a 42 4d 35 2c - 5a 42 4d 35 2c 5a 42 4d M5,ZBM5,ZBM5,ZBM
How can I found out what the error mean, and where the error happen ?
Thank you very much.
| |
| Robert 2005-05-10, 8:55 am |
| I can only give some general recommendations:
1) Check if you have "leftover" objects. To do so, count the number of
active instances for each class/form/usercontrol type you have. This works
by declaring a public variable in a BAS module, incrementing this variable
in the Class_Initialize (or Form_Initialize, Usercontrol_Initialize)-Event
and decrementing it in the _Terminate-Event. If the numbers do not match the
number of instances you think you should have (e.g. you created 10
instances, then destroyed 8 of them, but the counter says you still have 10
instances), then there may be a fault in your object termination strategy
(circular references that are not resolved, for example). This MAY or MAY
NOT cause the behaviour you describe - but it's good to check it, anyway.
2) Log to a file. Write a logging entry whenever you pass an important line
of your code. That way, you have a chance to find out what happened just
before the crash. Maybe that can give you a clue.
Robert
"Paul fpvt2" <Paulfpvt2@discussions.microsoft.com> wrote in message
news:15C944F5-291E-4245-8F0A-F206552542A0@microsoft.com...
> I have a VB 6 application that uses TCP control to receives request from
user
> and send strings to users. Users login and logout of the appl. often.
> Everytime after running the appl. for about 2 hours, the appl. just
> dies/terminates. I found out I got a Dr. Watson error (access violation)
> like the following:
>
> Application exception occurred:
> App: (pid=336)
> When: 5/9/2005 @ 10:43:56.154
> Exception number: c0000005 (access violation)
>
> *----> System Information <----*
> Number of Processors: 2
> Processor Type: x86 Family 6 Model 7 Stepping 3
> Windows 2000 Version: 5.0
> Current Build: 2195
> Service Pack: 4
> Current Type: Multiprocessor Free
>
> *----> Task List <----*
> 336 BD.exe
> :
> State Dump for Thread Id 0x6bc
>
> function: <nosymbols>
>
> *----> Stack Back Trace <----*
>
> FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
> 0012F3B4 6C3EBE0A 6C41DC10 00000000 0102FF40 0102C8CC <nosymbols>
> 0012F3CC 6C3FA994 6C41DC10 0012F458 01223A18 00000001 !Ordinal3258
> 779DB790 0000C766 0004C200 90909090 748B5653 66570C24 !Ordinal3237
>
> *----> Raw Stack Dump <----*
> 0012f3b8 0a be 3e 6c 10 dc 41 6c - 00 00 00 00 40 ff 02 01
...>l..Al....@...
> 0012f3c8 cc c8 02 01 90 b7 9d 77 - 94 a9 3f 6c 10 dc 41 6c
........w..?l..Al
> 0012f3d8 58 f4 12 00 18 3a 22 01 - 01 00 00 00 58 f4 12 00
X....:".....X...
> 0012f3e8 cc c8 02 01 40 f4 12 00 - 48 f6 12 00 c8 f8 12 00
.....@...H.......
> 0012f3f8 58 4f 22 01 00 00 00 00 - ab 8e 52 73 00 85 22 01
XO".......Rs..".
> 0012f408 00 00 00 00 58 f4 12 00 - 00 00 00 00 00 f9 12 00
.....X...........
> 0012f418 8c f9 12 00 01 00 00 00 - 30 f4 12 00 28 60 38 01
.........0...(`8.
> 0012f428 07 00 00 00 00 f9 12 00 - 00 00 00 00 00 00 00 00
.................
> 0012f438 00 00 00 00 00 00 00 00 - 68 f4 12 00 86 8f 52 73
.........h.....Rs
> 0012f448 48 f6 12 00 58 f4 12 00 - 8c f9 12 00 01 00 00 00
H...X...........
> 0012f458 09 00 00 00 00 00 00 00 - 7a 12 52 73 84 f4 12 00
.........z.Rs....
> 0012f468 84 f4 12 00 37 90 52 73 - 48 f6 12 00 80 f4 12 00
.....7.RsH.......
> 0012f478 8c f9 12 00 01 00 00 00 - 00 00 00 00 e8 f8 12 00
.................
> 0012f488 f2 9f 40 00 28 4b 40 00 - 48 f6 12 00 b8 f8 12 00
...@.(K@.H.......
> 0012f498 00 f9 12 00 8c f9 12 00 - 01 00 00 00 00 00 00 00
.................
> 0012f4a8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
.................
> 0012f4b8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
.................
> 0012f4c8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
.................
> 0012f4d8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
.................
> 0012f4e8 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
.................
>
> State Dump for Thread Id 0x6c8
>
> eax=00000001 ebx=0014ad20 ecx=00000000 edx=00000000 esi=74fea3a0
edi=00000000
> eip=77f8289c esp=0136ff84 ebp=0136ffb4 iopl=0 nv up ei pl nz na pe
nc
> cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000
efl=00000202
>
>
> function: ZwRemoveIoCompletion
> 77f82891 b8a8000000 mov eax,0xa8
> 77f82896 8d542404 lea edx,[esp+0x4]
> ss:01b89e6b=????????
> 77f8289a cd2e int 2e
> 77f8289c c21400 ret 0x14
>
> *----> Stack Back Trace <----*
>
> FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
> 0136FFB4 7C57B388 74FDA57D 0000075E 00010000 0014AD20
> ntdll!ZwRemoveIoCompletion
> 0136FFEC 00000000 74FD6311 0014AD20 00000000 00000008 kernel32!lstrcmpiW
>
> *----> Raw Stack Dump <----*
> 0136ff84 63 63 fd 74 20 01 00 00 - bc ff 36 01 b0 ff 36 01 cc.t
......6...6.
> 0136ff94 a4 ff 36 01 08 64 fd 74 - 5e 07 00 00 00 00 01 00
...6..d.t^.......
> 0136ffa4 00 00 00 00 1c 00 00 00 - 00 00 fd 74 08 f0 23 01
............t..#.
> 0136ffb4 ec ff 36 01 88 b3 57 7c - 7d a5 fd 74 5e 07 00 00
...6...W|}..t^...
> 0136ffc4 00 00 01 00 20 ad 14 00 - 00 d0 fd 7f 0a 00 00 00 ....
............
> 0136ffd4 c0 ff 36 01 0a 00 00 00 - ff ff ff ff 44 1f 5c 7c
...6.........D.\|
> 0136ffe4 08 2b 57 7c 00 00 00 00 - 00 00 00 00 00 00 00 00
..+W|............
> 0136fff4 11 63 fd 74 20 ad 14 00 - 00 00 00 00 08 00 00 00 .c.t
............
> 01370004 01 01 00 00 ee ff ee ff - 00 00 00 00 00 00 02 01
.................
> 01370014 00 a0 0d 00 00 00 37 01 - 00 01 00 00 40 00 37 01
.......7.....@.7.
> 01370024 00 00 47 01 da 00 00 00 - 01 00 00 00 98 05 02 01
...G.............
> 01370034 00 00 00 00 d0 3c 39 01 - 00 00 00 00 83 10 08 00
......<9.........
> 01370044 01 01 08 00 00 00 00 00 - 01 00 00 00 b5 01 00 00
.................
> 01370054 00 02 00 00 44 31 39 32 - 35 7c 38 30 31 7c 4e 51
.....DDDDD|111|NQ
> 01370064 4d 35 2c 4e 51 4d 35 2c - 5a 42 4d 35 2c 5a 42 4d
M5,NQM5,ZBM5,ZBM
> 01370074 35 2c 5a 42 4d 35 2c 5a - 42 4d 35 2c 5a 42 4d 35
5,ZBM5,ZBM5,ZBM5
> 01370084 2c 5a 42 4d 35 2c 5a 42 - 4d 35 2c 5a 42 4d 35 2c
,ZBM5,ZBM5,ZBM5,
> 01370094 5a 42 4d 35 2c 5a 42 4d - 35 2c 5a 42 4d 35 2c 5a
ZBM5,ZBM5,ZBM5,Z
> 013700a4 42 4d 35 2c 5a 42 4d 35 - 2c 5a 42 4d 35 2c 5a 42
BM5,ZBM5,ZBM5,ZB
> 013700b4 4d 35 2c 5a 42 4d 35 2c - 5a 42 4d 35 2c 5a 42 4d
M5,ZBM5,ZBM5,ZBM
>
> How can I found out what the error mean, and where the error happen ?
> Thank you very much.
| |
| Paul fpvt2 2005-05-31, 8:55 pm |
| Thank you for your suggestions.
I changed the TCP control to MS Winsock control, and I don't have the
problem anymore.
Thanks.
"Robert" wrote:
> I can only give some general recommendations:
>
> 1) Check if you have "leftover" objects. To do so, count the number of
> active instances for each class/form/usercontrol type you have. This works
> by declaring a public variable in a BAS module, incrementing this variable
> in the Class_Initialize (or Form_Initialize, Usercontrol_Initialize)-Event
> and decrementing it in the _Terminate-Event. If the numbers do not match the
> number of instances you think you should have (e.g. you created 10
> instances, then destroyed 8 of them, but the counter says you still have 10
> instances), then there may be a fault in your object termination strategy
> (circular references that are not resolved, for example). This MAY or MAY
> NOT cause the behaviour you describe - but it's good to check it, anyway.
> 2) Log to a file. Write a logging entry whenever you pass an important line
> of your code. That way, you have a chance to find out what happened just
> before the crash. Maybe that can give you a clue.
>
> Robert
>
> "Paul fpvt2" <Paulfpvt2@discussions.microsoft.com> wrote in message
> news:15C944F5-291E-4245-8F0A-F206552542A0@microsoft.com...
> user
> ...>l..Al....@...
> ........w..?l..Al
> X....:".....X...
> .....@...H.......
> XO".......Rs..".
> .....X...........
> .........0...(`8.
> .................
> .........h.....Rs
> H...X...........
> .........z.Rs....
> .....7.RsH.......
> .................
> ...@.(K@.H.......
> .................
> .................
> .................
> .................
> .................
> .................
> edi=00000000
> nc
> efl=00000202
> ......6...6.
> ...6..d.t^.......
> ............t..#.
> ...6...W|}..t^...
> ............
> ...6.........D.\|
> ..+W|............
> ............
> .................
> .......7.....@.7.
> ...G.............
> ......<9.........
> .................
> .....DDDDD|111|NQ
> M5,NQM5,ZBM5,ZBM
> 5,ZBM5,ZBM5,ZBM5
> ,ZBM5,ZBM5,ZBM5,
> ZBM5,ZBM5,ZBM5,Z
> BM5,ZBM5,ZBM5,ZB
> M5,ZBM5,ZBM5,ZBM
>
>
>
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