[Vpn-help] BSOD in vfilter.sys with Win7 Enterprise (RTM) x86_64

Wed Sep 2 02:59:55 CDT 2009

Hi all,

Well, first BSOD since installing RTM and it looks like Shrew VPN
might be to blame. I don't have symbols for vfilter.sys, so this is a
little limited, but if anyone /does/ have them and wants to run this
again, I can supply the minidump file. Anyway, I've attached the KD
analysis of the minidump as far as it goes...

Running 2.1.5-rc-2 on Windows 7 Enterprise x86_64 build 7600 (RTM).

Thanks,

Stuart H.
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Loading Dump File [C:\Windows\Minidump\082409-18876-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: srv*c:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
Windows 7 Kernel Version 7600 MP (2 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255
Machine Name:
Kernel base = 0xfffff800`02a18000 PsLoadedModuleList = 0xfffff800`02c55e50
Debug session time: Mon Aug 24 12:48:13.075 2009 (GMT+1)
System Uptime: 6 days 2:36:09.475
Loading Kernel Symbols
...............................................................
................................................................
.....................................
Loading User Symbols
Loading unloaded module list
..................................................
ERROR: FindPlugIns 8007007b
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck A, {fffff9800000dc7a, 2, 0, fffff80002da30b6}

Unable to load image \SystemRoot\system32\DRIVERS\vfilter.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for vfilter.sys
*** ERROR: Module load completed but symbols could not be loaded for vfilter.sys
Probably caused by : vfilter.sys ( vfilter+1114 )

Followup: MachineOwner
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1: kd> !analyze -v
ERROR: FindPlugIns 8007007b
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

IRQL_NOT_LESS_OR_EQUAL (a)
An attempt was made to access a pageable (or completely invalid) address at an
interrupt request level (IRQL) that is too high.  This is usually
caused by drivers using improper addresses.
If a kernel debugger is available get the stack backtrace.
Arguments:
Arg1: fffff9800000dc7a, memory referenced
Arg2: 0000000000000002, IRQL
Arg3: 0000000000000000, bitfield :
	bit 0 : value 0 = read operation, 1 = write operation
	bit 3 : value 0 = not an execute operation, 1 = execute operation (only on chips which support this level of status)
Arg4: fffff80002da30b6, address which referenced memory

Debugging Details:
------------------

READ_ADDRESS: GetPointerFromAddress: unable to read from fffff80002cc00e0
 fffff9800000dc7a 

CURRENT_IRQL:  2

FAULTING_IP: 
nt!RtlUnicodeToMultiByteN+c6
fffff800`02da30b6 420fb60c08      movzx   ecx,byte ptr [rax+r9]

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0xA

PROCESS_NAME:  svchost.exe

TRAP_FRAME:  fffff880027b2010 -- (.trap 0xfffff880027b2010)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=000000000000da58 rbx=0000000000000000 rcx=fffff80002da30b1
rdx=fffff880027b2249 rsi=0000000000000000 rdi=0000000000000000
rip=fffff80002da30b6 rsp=fffff880027b21a0 rbp=fffff880027b23c0
 r8=fffffa80064c08b2  r9=fffff98000000222 r10=0000000000000008
r11=0000000000000008 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na po nc
nt!RtlUnicodeToMultiByteN+0xc6:
fffff800`02da30b6 420fb60c08      movzx   ecx,byte ptr [rax+r9] ds:f990:fffff980`0000dc7a=??
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002a89469 to fffff80002a89f00

STACK_TEXT:  
fffff880`027b1ec8 fffff800`02a89469 : 00000000`0000000a fffff980`0000dc7a 00000000`00000002 00000000`00000000 : nt!KeBugCheckEx
fffff880`027b1ed0 fffff800`02a880e0 : 00000000`00000000 fffff800`02a18000 fffffa80`05af2010 fffff880`02d7b5a7 : nt!KiBugCheckDispatch+0x69
fffff880`027b2010 fffff800`02da30b6 : fffffa80`064c0880 fffff800`02da2f8e 00000000`00000000 fffffa80`03a93ee0 : nt!KiPageFault+0x260
fffff880`027b21a0 fffff800`02da2f8e : 00000000`00000000 fffffa80`03a93ee0 fffffa80`00000000 00000000`00000000 : nt!RtlUnicodeToMultiByteN+0xc6
fffff880`027b21b0 fffff880`02d95114 : fffff880`027b2238 fffffa80`05aef7a0 00000000`00000000 fffffa80`00000008 : nt!RtlUnicodeStringToAnsiString+0x7e
fffff880`027b2210 fffff880`027b2238 : fffffa80`05aef7a0 00000000`00000000 fffffa80`00000008 00000000`00000000 : vfilter+0x1114
fffff880`027b2218 fffffa80`05aef7a0 : 00000000`00000000 fffffa80`00000008 00000000`00000000 00000000`00400008 : 0xfffff880`027b2238
fffff880`027b2220 00000000`00000000 : fffffa80`00000008 00000000`00000000 00000000`00400008 fffff880`027b2250 : 0xfffffa80`05aef7a0

STACK_COMMAND:  kb

FOLLOWUP_IP: 
vfilter+1114
fffff880`02d95114 ??              ???

SYMBOL_STACK_INDEX:  5

SYMBOL_NAME:  vfilter+1114

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: vfilter

IMAGE_NAME:  vfilter.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  49703e23

FAILURE_BUCKET_ID:  X64_0xA_vfilter+1114

BUCKET_ID:  X64_0xA_vfilter+1114

Followup: MachineOwner
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