Hungs When Installing Virtual Modem in WinXP Media Center.

Hi, guys:

Our software needs install four virtual modem in the windows system. Two LAP
NULL modem, 1 DUN NULL modem and 1 Fax NULL modem.

The driver and the driver installer run very well in Windows 2000 and
Windows XP professional(Home) version, but the driver installer hangs(not
response) when installing these 4 modems in Windows XP Media Center Edition
Version 2002(Service Pack 2).

The program cannot return when calling UpdateDriverForPlugAndPlayDevices..
May be it is important to tell you is that these modems must be attached to
another virtual serial port driver.

I use softice to get the following information:

===========================================

VComm: Exit VCommDevice::OnCloseIrpComplete ==It means our virtual Serial
port has been closed.

NTICE: Load32 START=F9FBC000 SIZE=1D40 KPEB=81BBD830 MOD=DBGV
roc
Process KPEB PID Threads Pri User Time Krnl Time Status
System 81BBD830 4 35 8 00000000 000002B9 Ready
SMSS 814B71F0 1BC 3 B 00000002 0000000B Idle
CSRSS 814C2DA0 204 A D 000000CC 0000014D Ready
WINLOGON 814C45E8 21C 14 D 000000A5 000000FE Ready
SERVICES 814EDA70 248 10 9 000000CE 00000221 Ready
LSASS 814EFC08 254 18 9 0000004E 00000042 Ready
SVCHOST 8153C288 324 13 8 00000008 0000000D Ready
SVCHOST 8154FDA0 354 9 8 00000029 0000002E Ready
SVCHOST 8161BD20 3A0 58 8 00000234 0000014C Ready
SVCHOST 81614DA0 3CC 7 8 00000001 0000000A Ready
SVCHOST 814CE228 408 E 8 0000000A 00000010 Ready
SPOOLSV 816228C0 528 F 8 00000005 00000011 Ready
EXPLORER 81433DA0 594 B 8 0000014A 000002D2 Ready
RUNDLL32 814AA528 608 4 8 00000005 00000008 Ready
EHTRAY 81503B28 614 5 8 00000007 0000000E Ready
CTFMON 8161CD10 620 1 8 00000006 0000000F Ready
MSMSGS 8155F528 63C 4 8 00000007 0000000D Ready
SVCHOST 8154C718 6B4 6 8 00000004 00000007 Ready
DSRSVC 814C3498 6D0 D 8 00000007 00000006 Ready
EHRECVR 8160F4D0 6F4 4 A 00000009 00000009 Ready
EHSCHED 81522DA0 724 F 8 0000000E 0000000C Ready
wuauclt 8154DB28 2C0 9 8 0000002C 00000022 Ready
DLLHOST 815727B8 404 12 8 00000029 0000001A Ready
ALG 815294F0 49C 7 8 00000004 00000007 Ready
EHMSAS 81252440 6BC 4 8 00000010 00000046 Idle
mmc 81240020 8FC 3 8 000000EF 00000147 Ready
wmiprvse 81284020 9F4 6 8 00000015 00000015 Ready
uninstall 812323C0 A40 4 8 000001A1 000000B8 Ready
DBGVIEW 81302BE8 AA4 2 8 0000000E 00000013 Ready
*Idle 80559580 0 1 0 00000000 000027F4 Running
:thread -x a40
Extended Thread Info for thread A44
KTEB: 814035E8 TID: A44 Process: uninstall(A40)
Base Pri: 8 Dyn. Pri: 8 Quantum: 5
Mode: User Suspended: 0 Switches: 00002223
TickCount: 0000382B Wait Irql: 0
Status: User Wait for WrLpcReply

Start EIP: KERNEL32!.text+F867 (7C810867)
Affinity: 00000001 Context Flags: A
KSS EBP: E2411008 Callback ESP: 00000000
Kernel Stack: F5BA7000 - F5BAC000 Stack Ptr: F5BABC50
User Stack: 00030000 - 00130000 Stack Ptr: 00000000
Kernel Time: 000000BB User Time: 000001A0
Create Time: 0E269C63E7B46700

SpinLock: 00000000 Service Table: 80559B40 Queue: 00000000
SE Token: E277A7D8 SE Acc. Flags: 001F03FF
UTEB: 7FFDF000 Except Frame: 0012BB78 Last Err: 000003F0

Active IRP Queue:
IRP (8123C9A8)

Thread Wait List:
Semaphore Object at 814037DC

Registers: ESI=FFDFF120 EDI=814035E8 EBX=814037DC EBP=F5BABC9C
Restart : EIP=804DBDE0 a.k.a. ntoskrnl!ExReleaseResourceLite+0210

F5BABC9C 805788EF ntoskrnl!ExReleaseResourceLite+0210
F5BABD50 804DF06B ntoskrnl!NtRequestWaitReplyPort+02E0
0012B78C 77E7A716 ntdll!.text+DB94
0012B798 77E7A747 RPCRT4!.text+9716
0012B7AC 77EF3675 RPCRT4!.text+9747
0012BB88 7200237C RPCRT4!.orpc+0675
0012BB9C 72002470 UNIPLAT!.text+137C
0012BBDC 615D58A5 UNIPLAT!.text+1470
0012C660 77948B91 MDMINST!.text+48A5
0012C9E0 779332D0 SETUPAPI!.text+00027B91
0012CA50 7792B13F SETUPAPI!.text+000122D0
0012CA90 7792BA9B SETUPAPI!.text+A13F
0012CAB0 7792B05B SETUPAPI!.text+AA9B
0012CAD8 7792B2C6 SETUPAPI!.text+A05B
0012CB10 5F522BBF SETUPAPI!.text+A2C6
0012DB08 5F522ED6 newdev!.text+1BBF
0012E544 5F523889 newdev!.text+1ED6
0012F17C 5F52397E newdev!.text+2889
0012F548 10007D7B newdev!.text+297E
00000000 00000000 SETUP!.text+6D7B


Extended Thread Info for thread A50
KTEB: 81410CA8 TID: A50 Process: uninstall(A40)
Base Pri: 8 Dyn. Pri: 8 Quantum: 11
Mode: User Suspended: 0 Switches: 00000002
TickCount: 000032C0 Wait Irql: 0
Status: User Wait for DelayExecution

Start EIP: KERNEL32!.text+F856 (7C810856)
Affinity: 00000001 Context Flags: A
KSS EBP: 00000000 Callback ESP: 00000000
Kernel Stack: F576D000 - F5770000 Stack Ptr: F576FCBC
User Stack: 00D70000 - 00E70000 Stack Ptr: FFFFFFFF
Kernel Time: 00000000 User Time: 00000000
Create Time: 0E269C63F45BEC80

SpinLock: 00000000 Service Table: 80559B80 Queue: 00000000
SE Token: 00000000 SE Acc. Flags: 001F03FF
UTEB: 7FFDE000 Except Frame: 00E6FFDC Last Err: 00000000

IRP Queue at 81410EB8 is empty

Thread Wait List:
Timer Object at 81410D98

Registers: ESI=FFDFF120 EDI=81410CA8 EBX=81410D08 EBP=F576FD0C
Restart : EIP=804DBDE0 a.k.a. ntoskrnl!ExReleaseResourceLite+0210

F576FD0C 8056603F ntoskrnl!ExReleaseResourceLite+0210
F576FD54 804DF06B ntoskrnl!ProbeForWrite+00BC
00E6FFB4 7C80B50B ntdll!.text+DB94
00E6FFEC 00000000 KERNEL32!.text+A50B


Extended Thread Info for thread A58
KTEB: 812328A8 TID: A58 Process: uninstall(A40)
Base Pri: 8 Dyn. Pri: 8 Quantum: 3
Mode: User Suspended: 0 Switches: 00000084
TickCount: 000037FB Wait Irql: 0
Status: User Wait for UserRequest

Start EIP: KERNEL32!.text+F856 (7C810856)
Affinity: 00000001 Context Flags: A
KSS EBP: 00000000 Callback ESP: 00000000
Kernel Stack: F5420000 - F5423000 Stack Ptr: F542295C
User Stack: 00F70000 - 01070000 Stack Ptr: FFFFFFFF
Kernel Time: 00000000 User Time: 00000000
Create Time: 0E269C63F45BEC80

SpinLock: 00000000 Service Table: 80559B80 Queue: 00000000
SE Token: 00000000 SE Acc. Flags: 001F03FF
UTEB: 7FFDC000 Except Frame: 0106FFDC Last Err: 00000000

IRP Queue at 81232AB8 is empty

Thread Wait List:
Timer Object at 815514A0
Event Object at 814E70E0
Event Object at 81256B00
Event Object at 8141D408
Event Object at 81456BD8
Event Object at 81456B48
Event Object at 8124AAD0
Event Object at 81237430
Event Object at 812373D0
Event Object at 81237370
Event Object at 812372E0
Event Object at 81236020
Event Object at 81236F90
Event Object at 81236F30
Event Object at 81236EA0
Event Object at 81236E40
Event Object at 81236DB0
Event Object at 81236D50
Event Object at 81237250
Event Object at 81255634
Timer Object at 815514A0
Event Object at 814E70E0
Event Object at 81256B00

Registers: ESI=FFDFF120 EDI=812328A8 EBX=813015B0 EBP=F54229B8
Restart : EIP=804DBDE0 a.k.a. ntoskrnl!ExReleaseResourceLite+0210

F54229B8 80566488 ntoskrnl!ExReleaseResourceLite+0210
F5422D48 804DF06B ntoskrnl!ProbeForWrite+0505
0106FFB4 7C80B50B ntdll!.text+DB94
0106FFEC 00000000 KERNEL32!.text+A50B


Extended Thread Info for thread A70
KTEB: 8124AB30 TID: A70 Process: uninstall(A40)
Base Pri: 8 Dyn. Pri: 8 Quantum: 10
Mode: User Suspended: 0 Switches: 00000001
TickCount: 000033B6 Wait Irql: 0
Status: User Wait for UserRequest

Start EIP: KERNEL32!.text+F856 (7C810856)
Affinity: 00000001 Context Flags: A
KSS EBP: 00000000 Callback ESP: 00000000
Kernel Stack: F5328000 - F532B000 Stack Ptr: F532A95C
User Stack: 01A30000 - 01B30000 Stack Ptr: FFFFFFFF
Kernel Time: 00000000 User Time: 00000000
Create Time: 0E269C640002BA80

SpinLock: 00000000 Service Table: 80559B80 Queue: 00000000
SE Token: 00000000 SE Acc. Flags: 001F03FF
UTEB: 7FFDA000 Except Frame: 01B2FF58 Last Err: 00000000

IRP Queue at 8124AD40 is empty

Thread Wait List:
Event Object at 81237B78
Event Object at 8162E948
Event Object at 8162EB30

Registers: ESI=FFDFF120 EDI=8124AB30 EBX=8124ABA0 EBP=F532A9B8
Restart : EIP=804DBDE0 a.k.a. ntoskrnl!ExReleaseResourceLite+0210

F532A9B8 80566488 ntoskrnl!ExReleaseResourceLite+0210
F532AD48 804DF06B ntoskrnl!ProbeForWrite+0505
01B2FF68 7C809C86 ntdll!.text+DB94
01B2FF84 769C888D KERNEL32!.text+8C86
01B2FFB4 7C80B50B USERENV!.text+788D
01B2FFEC 00000000 KERNEL32!.text+A50B


:irp -f 8123C9A8
MdlAddress * : 00000000
Flags : 00000000
AssociatedIrp : 00000000
&ThreadListEntry : 8123C9B8
IoStatus.Status : 00000000
IoStatus.Information : E282C600
RequestorMode : 01
PendingReturned : False
StackCount : 08
CurrentLocation : 08
Cancel : False
CancelIrql : 00
ApcEnvironment : 00
UserIosb * : 7C8837E0
UserEvent * : 00000000
Overlay : 00000000 00000000
CancelRoutine * : 80512601
UserBuffer * : 7C883800
Tail.Overlay
&DeviceQueueEntry : 8123C9E8
Thread * : 814035E8
AuxiliaryBuffer * : 00000000
&ListEntry : 8123CA00
CurrentStackLoc * : 8123CB14
OrigFileObject * : 812555D8
Tail.Apc * : 8123C9E8
Tail.ComplKey : 00000000

StackLocation 1 at 8123CA18:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 2 at 8123CA3C:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 3 at 8123CA60:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 4 at 8123CA84:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 5 at 8123CAA8:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 6 at 8123CACC:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

StackLocation 7 at 8123CAF0:
MajorFunction : 00 IRP_MJ_CREATE
MinorFunction : 00
Control : 00
Flags : 00
SecurityContext * : 00000000
Options : 00000000
FileAttributes : 00000000
ShareAccess : 00000000
EaLength : 00000000
DeviceObject * : 00000000
FileObject * : 00000000
CompletionRout * : 00000000
Context * : 00000000

CurrentStackLocation at 8123CB14:
MajorFunction : 0C IRP_MJ_DIRECTORY_CONTROL
MinorFunction : 02
Control : 01 SL_PENDING_RETURNED
Flags : 01
Others : 00000020 0000001B 00000000 00000000
DeviceObject * : 81B68A98
FileObject * : 812555D8
CompletionRout * : 00000000
Context * : 00000000


===================================

I noticed that the IRP IRP_MJ_DIRECTORY_CONTROL is pending (even I don't
know which program sends this IRP).

Would you please tell me why the installer program hangs and if it is caused
by our program or other system components?

Thank you very much for reading my post and wish someone help me. :-)

Best Regards,
Goooder