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BSOD SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (7e) happens after ObDereferenceObject in IRP_MJ_CLOSE

Pooja_BansalPooja_Bansal Member - All Emails Posts: 44

Hi,
I am working on minifilter driver based upon shadow file object design.
In IRP_MJ_CLOSE, we try to delete lowerfileobject through ObDereferenceObject, but after random iterations of file create->read/write->close, it crashes.

EXCEPTION_RECORD: ffffcf01832a7298 -- (.exr 0xffffcf01832a7298)
ExceptionAddress: fffff802410f3caf (nt!ExAcquireFastMutex+0x00000000000000cf)
ExceptionCode: c0000005 (Access violation)
ExceptionFlags: 00000000
NumberParameters: 2
Parameter[0]: 0000000000000001
Parameter[1]: 00000000000001b7
Attempt to write to address 00000000000001b7

CONTEXT: ffffcf01832a6ae0 -- (.cxr 0xffffcf01832a6ae0)
rax=0000000000000000 rbx=0000000000000000 rcx=7ffffffffffffffc
rdx=000000000000003a rsi=ffff960a2f47e3c0 rdi=00000000000001b7
rip=fffff802410f3caf rsp=ffffcf01832a74d0 rbp=0000000000000001
r8=00000000ffffffff r9=ffff960a2d080880 r10=0000000000000000
r11=ffff960a2f47e040 r12=0000000000000000 r13=ffff960a2d978420
r14=0000000000000000 r15=0000000000000012
iopl=0 nv up ei pl zr na po nc
cs=0010 ss=0018 ds=002b es=002b fs=0053 gs=002b efl=00010246
nt!ExAcquireFastMutex+0xcf:
fffff802410f3caf f00fba3700 lock btr dword ptr [rdi],0 ds:002b:00000000000001b7=????????

Call stack:

STACK_TEXT:
ffffcf01832a74d0 fffff8027e43307c : ffffffffffffffff ffff960a00000001 ffff960a2f4d9638 ffff960a2f4d95e8 : nt!ExAcquireFastMutex+0xcf
ffffcf01832a7510 fffff8027e40360a : ffffcf01832a75e0 ffff960a2e47d860 ffff960a2d9437e0 ffff960a2eb2e020 : FLTMGR!FltpCleanupFileObjectContextForCleanup+0x4c
ffffcf01832a7540 fffff8027e40312e : ffff960a2d080880 ffff960a2f4d95e8 ffff960a2eb2e020 ffff960a2d673080 : FLTMGR!FltpPassThrough+0x42a
ffffcf01832a75c0 fffff802414e15a0 : ffff960a2e47d860 ffff960a2d943040 0000000000000000 ffff960a2f8bbbe8 : FLTMGR!FltpDispatch+0x9e
ffffcf01832a7620 fffff802415ea926 : 0000000000000001 ffff960a2e47d860 0000000000000001 0000000000000000 : nt!IopCloseFile+0x150
ffffcf01832a76b0 fffff802414fd2e8 : ffffcf01832a7929 0000000000000000 ffff960a2d14cf20 0000000010000004 : nt!IopDeleteFile+0x109746
ffffcf01832a7730 fffff8024111cf21 : 0000000000000000 0000000000000000 ffffcf01832a7929 ffff960a2e47d860 : nt!ObpRemoveObjectRoutine+0x78
ffffcf01832a7790 fffff8027f960f87 : 0000000000000000 ffff960a2ea2dc00 ffff960a2d9784a0 0000000000000000 : nt!ObfDereferenceObject+0xa1
ffffcf01832a77d0 fffff8027e4046ca : ffff960a2ea2dcd8 ffffcf01832a7900 ffffcf01832a78e0 ffff960a2d9437e0 : MyDriver!PfmCloseCallback+0x437
ffffcf01832a7880 fffff8027e404278 : ffffcf01832a7a60 ffff960a2f797900 0000000000000002 ffff960a2f142000 : FLTMGR!FltpPerformPreCallbacks+0x2ea
ffffcf01832a7990 fffff8027e403386 : ffff960a2f142010 ffffcf01832a7a60 ffff960a2f142010 ffffcf01832a7a70 : FLTMGR!FltpPassThroughInternal+0x88
ffffcf01832a79c0 fffff8027e40312e : fffffffffffe7960 0000000000000000 ffff960a2f142368 0000000000000000 : FLTMGR!FltpPassThrough+0x1a6
ffffcf01832a7a40 fffff802810f10f5 : ffff960a2f142320 ffff960a2fdbb520 0000000000000000 0000000000000001 : FLTMGR!FltpDispatch+0x9e
ffffcf01832a7aa0 fffff802810fd1d4 : ffff960a2f142010 0000000000000001 ffff960a2f142010 0000000000000190 : FSpy+0x10f5
ffffcf01832a7b10 fffff802414e130d : ffff960a2f142010 ffff960a2d297080 ffff960a2f142010 ffff960a2f4e2ec0 : FSpy+0xd1d4
ffffcf01832a7b40 fffff802414fd2e8 : fffff8024146630c 0000000000000001 ffff960a2d14cf20 0000000000000001 : nt!IopDeleteFile+0x12d
ffffcf01832a7bc0 fffff802414665e0 : 0000000000000000 ffff960a2d297050 fffff8024146630c fffff80241314f40 : nt!ObpRemoveObjectRoutine+0x78
ffffcf01832a7c20 fffff802410dae09 : ffff960a2f47e040 fffff8024146630c fffff80241314f40 fffff802413cf280 : nt!ObpProcessRemoveObjectQueue+0x2d4
ffffcf01832a7cc0 fffff802410ab2c1 : ffff960a2f47e040 0000000000000080 ffff960a2d021040 ffff960a2f47e040 : nt!ExpWorkerThread+0xe9
ffffcf01832a7d50 fffff80241178c76 : ffffcf017ffc7180 ffff960a2f47e040 fffff802410ab280 0000000002000005 : nt!PspSystemThreadStartup+0x41
ffffcf01832a7da0 0000000000000000 : ffffcf01832a8000 ffffcf01832a2000 0000000000000000 0000000000000000 : nt!KiStartSystemThread+0x16

Can anyone please help to understand this issue.
Thanks a lot in advance!

Comments

  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,017

    What analysis have you done so far?

    • What are you not running with verifier?
    • What is the refcount of the object you are dereferencing?
    • What is the refcount before you dereference it?
    • Does it even look like a file object at that point?
    • What does {{!verifer}} 80 say about it?

    FWIW and in case the qoestions don't make it obvious, my money would be on you having a mismatch on your object reference and dereferences

  • Pooja_BansalPooja_Bansal Member - All Emails Posts: 44
    1. Standard settings for mydriver are enabled in verifier.
      Below settings are not enabled
      ADDITIONAL FLAGS:
      [ ] (0x00000004) Randomized low resources simulation
      [ ] (0x00000200) Force pending I/O requests
      [ ] (0x00000400) IRP logging
      [ ] (0x00002000) Invariant MDL checking for stack
      [ ] (0x00004000) Invariant MDL checking for driver
      [ ] (0x00008000) Power framework delay fuzzing
      [ ] (0x00010000) Port/miniport interface checking
      [ ] (0x00040000) Systematic low resources simulation
      [ ] (0x00080000) DDI compliance checking (additional)
      [ ] (0x00200000) NDIS/WIFI verification
      [ ] (0x00800000) Kernel synchronization delay fuzzing
      [ ] (0x01000000) VM switch verification
      [ ] (0x02000000) Code integrity checks

    2. LowerFileObject(the one geting derefernced), its _FSRTL_ADVANCED_FCB_HEADER and _FAST_MUTEX seems to be valid,

    1: kd> dx -r1 ((sfntpffd!_FILE_OBJECT *)0xffff960a2e47d860)
    ((sfntpffd!_FILE_OBJECT *)0xffff960a2e47d860) : 0xffff960a2e47d860 [Type: _FILE_OBJECT *]
    [+0x000] Type : 5 [Type: short]
    [+0x002] Size : 216 [Type: short]
    [+0x008] DeviceObject : 0xffff960a2d8f9c80 : Device for "\Driver\volmgr" [Type: _DEVICE_OBJECT *]
    [+0x010] Vpb : 0xffff960a2d792ea0 [Type: _VPB *]
    [+0x018] FsContext : 0xffffbb0cb06a2c00 [Type: void *]
    [+0x020] FsContext2 : 0xffffbb0cb06a2e48 [Type: void *]
    [+0x028] SectionObjectPointer : 0xffff960a2f8ba518 [Type: _SECTION_OBJECT_POINTERS *]
    [+0x030] PrivateCacheMap : 0x0 [Type: void *]
    [+0x038] FinalStatus : 0 [Type: long]
    [+0x040] RelatedFileObject : 0x0 [Type: _FILE_OBJECT *]
    [+0x048] LockOperation : 0x0 [Type: unsigned char]
    [+0x049] DeletePending : 0x0 [Type: unsigned char]
    [+0x04a] ReadAccess : 0x1 [Type: unsigned char]
    [+0x04b] WriteAccess : 0x0 [Type: unsigned char]
    [+0x04c] DeleteAccess : 0x0 [Type: unsigned char]
    [+0x04d] SharedRead : 0x1 [Type: unsigned char]
    [+0x04e] SharedWrite : 0x1 [Type: unsigned char]
    [+0x04f] SharedDelete : 0x1 [Type: unsigned char]
    [+0x050] Flags : 0x44042 [Type: unsigned long]
    [+0x058] FileName : "\enc1\test.txt" [Type: _UNICODE_STRING]
    [+0x068] CurrentByteOffset : {0} [Type: _LARGE_INTEGER]
    [+0x070] Waiters : 0x0 [Type: unsigned long]
    [+0x074] Busy : 0x0 [Type: unsigned long]
    [+0x078] LastLock : 0x0 [Type: void *]
    [+0x080] Lock [Type: _KEVENT]
    [+0x098] Event [Type: _KEVENT]
    [+0x0b0] CompletionContext : 0x0 [Type: _IO_COMPLETION_CONTEXT *]
    [+0x0b8] IrpListLock : 0x0 [Type: unsigned __int64]
    [+0x0c0] IrpList [Type: _LIST_ENTRY]
    [+0x0d0] FileObjectExtension : 0xffff960a2d1208a0 [Type: void *]

    1: kd> dt nt!_FSRTL_ADVANCED_FCB_HEADER 0xffffbb0cb06a2c00
    +0x000 NodeTypeCode : 0n1797
    +0x002 NodeByteSize : 0n584
    +0x004 Flags : 0x40 '@'
    +0x005 IsFastIoPossible : 0x2 ''
    +0x006 Flags2 : 0x2 ''
    +0x007 Reserved : 0y0000
    +0x007 Version : 0y0011
    +0x008 Resource : 0xffff960a2f8ba4a0 _ERESOURCE +0x010 PagingIoResource : 0xffff960a2f8ba550 _ERESOURCE
    +0x018 AllocationSize : _LARGE_INTEGER 0xf76000
    +0x020 FileSize : _LARGE_INTEGER 0xf750c7
    +0x028 ValidDataLength : _LARGE_INTEGER 0xf750a0
    +0x030 FastMutex : 0xffff960a2f8ba468 _FAST_MUTEX +0x038 FilterContexts : _LIST_ENTRY [ 0xffffbb0cb06a2c38 - 0xffffbb0cb06a2c38 ] +0x048 PushLock : _EX_PUSH_LOCK +0x050 FileContextSupportPointer : 0xffffbb0cb06a2bf0 -> (null)
    +0x058 Oplock : (null)
    +0x058 ReservedForRemote : (null)
    +0x060 ReservedContext : 0xffff960a`2f8b0a08 Void

    1: kd> dx -r1 ((ntkrnlmp!_FAST_MUTEX *)0xffff960a2f8ba468)
    ((ntkrnlmp!_FAST_MUTEX *)0xffff960a2f8ba468) : 0xffff960a2f8ba468 [Type: _FAST_MUTEX *]
    [+0x000] Count : 1 [Type: long]
    [+0x008] Owner : 0x0 [Type: void *]
    [+0x010] Contention : 0x2f3b [Type: unsigned long]
    [+0x018] Event [Type: _KEVENT]
    [+0x030] OldIrql : 0x0 [Type: unsigned long]

    1. I am not sure where should I check for ref count of LowerFileObject.

    Since this bugcheck happens nt!ExAcquireFastMutex+0xcf, I want to understand which Fast Mutex it is trying to access. I check FastMutex in AdvancedFCBHeader of LowerFileObj, which seems fine.

    Any help further is really appreciated.
    Thanks in advance!

  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,017

    Interesting

    I am not sure where should I check for ref count of LowerFileObject

    !object is your friend

    I check FastMutex in AdvancedFCBHeader of LowerFileObj, which seems fine.

    That was my assumption. You'll need to pick through the assember and see whather that was true (you know what the address is, so that makes it easier - you may even find evidence in the registers

    I'd still be doing a !pool <addre> 2 and a !verifier 80 <<addr>> on the file object and the contexts...

  • Pooja_BansalPooja_Bansal Member - All Emails Posts: 44

    Thanks for further insights.

    As per dump, bsod occurs while accessing rbx register
    nt!ExAcquireFastMutex+ce
    fffff800`d2878d7e f00fba3300 lock btr dword ptr [rbx],0

    rax=ffffd001377b9428
    rbx=00000000000001a7
    rcx=00000000000001a7
    rdx=ffffe0002105baa8
    rsi=0000000000000000
    rdi=0000000000000000
    rip=fffff800d2878d7e
    rsp=ffffd001377b93d0
    rbp=0000000000000001
    r8=0000000000000000
    r9=0000000000000012
    r10=ffffe00021188bc0
    r11=ffffe000205461e0
    r12=0000000000000000
    r13=0000000000000001
    r14=0000000000000000
    r15=ffffe0001fa881e0

    I did try to use !pool <adddres. 2 for register values, which gave me some valid information w.r.t. this scenario

    kd> !pool ffffe0002105baa8 2
    Pool page ffffe0002105baa8 region is Nonpaged pool
    *ffffe0002105ba50 size: c0 previous size: 110 (Allocated) *FMfc
    Pooltag FMfc : FLTMGR_FILE_OBJECT_CONTEXT structure, Binary : fltmgr.sys

    0: kd> !pool ffffe00021188bc0 2
    Pool page ffffe00021188bc0 region is Nonpaged pool
    *ffffe00021188bb0 size: 30 previous size: 90 (Allocated) *FOCX
    Pooltag FOCX : File System Run Time File Object Context structure, Binary : nt!fsrtl

    0: kd> !pool ffffe000205461e0 2
    Pool page ffffe000205461e0 region is Nonpaged pool
    *ffffe000205461d0 size: 820 previous size: 70 (Allocated) *FMvo
    Pooltag FMvo : FLT_VOLUME structure, Binary : fltmgr.sys

    : kd> !pool ffffe0001fa881e0 2
    Pool page ffffe0001fa881e0 region is Nonpaged pool
    *ffffe0001fa881d0 size: 790 previous size: 30 (Allocated) *FMfr
    Pooltag FMfr : FLT_FRAME structure, Binary : fltmgr.sys

    where FLT_VOLUME and FLT_FRAME are valid pointers .

    Now, I am struggling to relate information of FOCX : File System Run Time File Object Context and FLTMGR_FILE_OBJECT_CONTEXT structures to debug this case.

    Any help will be really appreciated!

    Thanks a lot!

  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,017

    {{!fltkd.help}} might provide some insight. But I'm struggling a bit.. We are certainly not dealing with a over-dereferenced object

  • Pooja_BansalPooja_Bansal Member - All Emails Posts: 44

    In my driver , we are dereferencing lowerfileobj at single place in Close IRP, not sure how it is leading to over dereferencing of object.

  • Scott_Noone_(OSR)Scott_Noone_(OSR) Administrator Posts: 3,099

    I'd guess based on the name "FltpCleanupFileObjectContextForCleanup" that the fast mutex is part of FltMgr's file object context. Doing a uf on FltpPassThrough on RS5 it looks like you should only get here on an IRP_MJ_CLEANUP, which also makes sense based on the name, but makes no sense based on the stack.

    If you do a !thread what IRPs are pending against the thread? Also, you should also enable Verifier on FltMgr.sys. If that doesn't show anything interesting you might also want to enable it on ntoskrnl.exe.

    -scott
    OSR

  • Pooja_BansalPooja_Bansal Member - All Emails Posts: 44

    Thanks for your reply Scott!
    I have listed output of !thread and 2 of IRPs.

    0: kd> !thread
    THREAD ffffe0001fd0e880 Cid 0004.0078 Teb: 0000000000000000 Win32Thread: 0000000000000000 RUNNING on processor 0
    IRP List:
    ffffe00021074250: (0006,0310) Flags: 00000404 Mdl: 00000000
    ffffe000210e5cf0: (0006,0310) Flags: 00000404 Mdl: 00000000

    Not impersonating
    DeviceMap ffffc001b020c2a0
    Owning Process ffffe0001fac9900 Image: System
    Attached Process N/A Image: N/A
    Wait Start TickCount 77263 Ticks: 0
    Context Switch Count 10716 IdealProcessor: 0
    UserTime 00:00:00.000
    KernelTime 00:00:01.343
    Win32 Start Address nt!ExpWorkerThread (0xfffff800d285e4e0)
    Stack Init ffffd001377b9c90 Current ffffd001377b98b0
    Base ffffd001377ba000 Limit ffffd001377b4000 Call 0000000000000000
    Priority 13 BasePriority 13 PriorityDecrement 0 IoPriority 2 PagePriority 5
    Child-SP RetAddr : Args to Child : Call Site
    ffffd001377b81c8 fffff800d2959a05 : 000000000000007e ffffffffc0000005 fffff800d2878d7e ffffd001377b9198 : nt!KeBugCheckEx
    ffffd001377b81d0 fffff800d2932236 : 00000000016006b5 0000000000000000 fffff6d800f5c468 ffffb001eb88c000 : nt! ?? ::FNODOBFM::string'+0x1b15 ffffd001377b8210 fffff800d294bd3d : 0000000000000000 ffffd001377b83b0 ffffd001377b9198 ffffd001377b83b0 : nt!_C_specific_handler+0x86 ffffd001377b8280 fffff800d28859e9 : 0000000000000001 fffff800d2803000 ffffd001377b9100 ffffc00100000000 : nt!RtlpExecuteHandlerForException+0xd ffffd001377b82b0 fffff800d28dca79 : ffffd001377b9198 ffffd001377b8eb0 ffffd001377b9198 0000000000000000 : nt!RtlDispatchException+0x1a5 ffffd001377b8980 fffff800d2953502 : 00000000000001a7 ffffd001377b90f8 ffffd001746c464d 0000000000000081 : nt!KiDispatchException+0x18d ffffd001377b9060 fffff800d295093c : 0000000000000000 ffffe0001fc61000 ffffe00021083c00 fffff800d286656f : nt!KiExceptionDispatch+0xc2 ffffd001377b9240 fffff800d2878d7e : 0000000000000001 0000000000000000 ffffe0002105baa8 fffff8016a6cbe82 : nt!KiPageFault+0x3fc (TrapFrame @ ffffd001377b9240)
    ffffd001377b93d0 fffff8016a6f59c0 : ffffe0002105baf8 ffffffffffffffff ffffe0002105baa8 0000000000000012 : nt!ExAcquireFastMutex+0xce
    ffffd001377b9400 fffff8016a6c7bfd : ffffd001377b9500 ffffd001377b9480 ffffe00021074518 ffffe0001fce7f20 : fltmgr!FltpCleanupFileObjectContextForCleanup+0x4c
    ffffd001377b9430 fffff8016a6c70aa : ffffe00020546a50 0000000000000000 ffffe00021074250 0000000000000000 : fltmgr!FltpPassThrough+0x57e
    ffffd001377b94e0 fffff800d2bb990d : ffffe00021074250 0000000000000000 0000000000000000 0000000000000002 : fltmgr!FltpDispatch+0x9a
    ffffd001377b9540 fffff800d2d27750 : ffffe0001fce7f20 0000000000000000 ffffe000656c6946 ffffe0001fb33f20 : nt!IopCloseFile+0x12d
    ffffd001377b95d0 fffff800d2bbd30c : 0000000000000000 ffffe0001fce7f20 ffffe0001fb33f20 ffffe0001fce7ef0 : nt! ?? ::NNGAKEGL::string'+0x10950 ffffd001377b9650 fffff800d286967f : 0000000000000000 ffffd001377b9720 ffffe0001fce7f20 ffffe0001fa383d0 : nt!ObpRemoveObjectRoutine+0x64 ffffd001377b96b0 fffff8016a72a770 : ffffe00021952360 ffffe0001fc1d598 ffffe0001fc1d598 ffffe0001fa383d0 : nt!ObfDereferenceObject+0x8f ffffd001377b96f0 fffff8016a6c80ba : ffffe0001fc1d598 ffffe0001fc1d4c0 ffffe000205359a0 ffffe00021948828 : sfntpffd!PfmCloseCallback+0x1c8 [d:\pf-windows\fe-src\ds-client-fe\fe\kernel\windows\minifilter\src\close.c @ 240] ffffd001377b9790 fffff8016a6c8d0c : ffffd001377b99a0 fffff800d2946302 ffffe00020546a00 0000000000000000 : fltmgr!FltpPerformPreCallbacks+0x31a ffffd001377b98a0 fffff8016a6c7934 : ffffe0001fc1d4c0 ffffd001377b9920 ffffe000210e5fb8 fffff800d2ae3180 : fltmgr!FltpPassThroughInternal+0x8c ffffd001377b98d0 fffff8016a6c70aa : ffffe00020546a50 ffffe000210e5cf0 ffffe000210e5cf0 ffffe0001fb33f20 : fltmgr!FltpPassThrough+0x2b5 ffffd001377b9980 fffff800d2bb96cc : ffffe000211a5cf0 ffffe0001fa53030 ffffe000210e5cf0 0000000000000001 : fltmgr!FltpDispatch+0x9a ffffd001377b99e0 fffff800d2bbd30c : ffffe000211a5cc0 ffffe000211a5cf0 ffffe0001fb33f20 ffffe000211a5cc0 : nt!IopDeleteFile+0x128 ffffd001377b9a60 fffff800d2c6ccd9 : 0000000000000000 0000000000000000 fffff800d2aaee00 0000000000000000 : nt!ObpRemoveObjectRoutine+0x64 ffffd001377b9ac0 fffff800d285eb7f : fffff800d2c6cc20 ffffe0001fd0e880 fffff800d2aaee00 0000000000000000 : nt!ObpProcessRemoveObjectQueue+0xb9 ffffd001377b9b50 fffff800d28d6da2 : 0000000000000000 ffffd0013b555180 0000000000000080 ffffe0001fac9900 : nt!ExpWorkerThread+0x69f ffffd001377b9c00 fffff800d294ac36 : ffffd0013b555180 ffffe0001fd0e880 ffffe0001fbd3880 0000000000000000 : nt!PspSystemThreadStartup+0x18a ffffd001377b9c60 0000000000000000 : ffffd001377ba000 ffffd001`377b4000 00

    0: kd> !irp ffffe00021074250
    Irp is active with 8 stacks 8 is current (= 0xffffe00021074518)
    No Mdl: No System Buffer: Thread ffffe0001fd0e880: Irp stack trace.
    cmd flg cl Device File Completion-Context
    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [IRP_MJ_CLEANUP(12), N/A(0)]

    0 0 ffffe00020546a50 ffffe0001fce7f20 00000000-00000000
    \FileSystem\FltMgr
    Args: 00000000 00000000 00000000 00000000

    kd> !irp ffffe000210e5cf0
    Irp is active with 8 stacks 8 is current (= 0xffffe000210e5fb8)
    No Mdl: No System Buffer: Thread ffffe0001fd0e880: Irp stack trace.
    cmd flg cl Device File Completion-Context
    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [N/A(0), N/A(0)]
    0 0 00000000 00000000 00000000-00000000

            Args: 00000000 00000000 00000000 00000000
    

    [IRP_MJ_CLOSE(2), N/A(0)]

    0 1 ffffe00020546a50 ffffe000211a5cf0 00000000-00000000 pending
    \FileSystem\FltMgr
    Args: 00000000 00000000 00000000 00000000

  • Scott_Noone_(OSR)Scott_Noone_(OSR) Administrator Posts: 3,099

    Can you make a dump file available? Easier than trying to debug over the forum.

    -scott
    OSR

  • Pooja_BansalPooja_Bansal Member - All Emails Posts: 44

    Where shall I upload dump file?

  • Scott_Noone_(OSR)Scott_Noone_(OSR) Administrator Posts: 3,099

    Something like Dropbox/OneDrive is usually the easiest.

    -scott
    OSR

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