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VerifierMmUnmapLockedPages() crash when reading from file
Posted by Anonymous on Sat 10th May 2025 12:01
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  1. Microsoft (R) Windows Debugger Version 10.0.19041.685 AMD64
  2. Copyright (c) Microsoft Corporation. All rights reserved.
  3.  
  4.  
  5. Loading Dump File [C:\Windows\MEMORY.DMP]
  6. Kernel Bitmap Dump File: Full address space is available
  7.  
  8. Symbol search path is: srv*
  9. Executable search path is:
  10. Page 200006ae6 too large to be in the dump file.
  11. Page 200002d34 too large to be in the dump file.
  12. Page 200002d34 too large to be in the dump file.
  13. Windows 10 Kernel Version 19041 MP (8 procs) Free x64
  14. Product: WinNt, suite: TerminalServer SingleUserTS
  15. Built by: 19041.1.amd64fre.vb_release.191206-1406
  16. Machine Name:
  17. Kernel base = 0xfffff800`31412000 PsLoadedModuleList = 0xfffff800`3203c760
  18. Debug session time: Sat May 10 12:47:51.874 2025 (UTC + 2:00)
  19. System Uptime: 0 days 0:04:31.858
  20. Loading Kernel Symbols
  21. ...............................................................
  22. ................................................................
  23. ................................................................
  24. ......................
  25. Loading User Symbols
  26. ..................
  27. Loading unloaded module list
  28. .............
  29. For analysis of this file, run !analyze -v
  30. 2: kd> !analyze -v
  31. *******************************************************************************
  32. *                                                                             *
  33. *                        Bugcheck Analysis                                    *
  34. *                                                                             *
  35. *******************************************************************************
  36.  
  37. DRIVER_VERIFIER_DETECTED_VIOLATION (c4)
  38. A device driver attempting to corrupt the system has been caught.  This is
  39. because the driver was specified in the registry as being suspect (by the
  40. administrator) and the kernel has enabled substantial checking of this driver.
  41. If the driver attempts to corrupt the system, bugchecks 0xC4, 0xC1 and 0xA will
  42. be among the most commonly seen crashes.
  43. Arguments:
  44. Arg1: 00000000000000b9, MmUnmapLockedPages called with a bad user space address.
  45. Arg2: 000001ffd7440d00, Address being unmapped.
  46. Arg3: ffffe68dc2f46f40, MDL address.
  47. Arg4: 0000000000000000, Reserved (unused).
  48.  
  49. Debugging Details:
  50. ------------------
  51.  
  52.  
  53. KEY_VALUES_STRING: 1
  54.  
  55.     Key  : Analysis.CPU.Sec
  56.     Value: 5
  57.  
  58.     Key  : Analysis.DebugAnalysisProvider.CPP
  59.     Value: Create: 8007007e on WINGRENDEL02
  60.  
  61.     Key  : Analysis.DebugData
  62.     Value: CreateObject
  63.  
  64.     Key  : Analysis.DebugModel
  65.     Value: CreateObject
  66.  
  67.     Key  : Analysis.Elapsed.Sec
  68.     Value: 7
  69.  
  70.     Key  : Analysis.Memory.CommitPeak.Mb
  71.     Value: 77
  72.  
  73.     Key  : Analysis.System
  74.     Value: CreateObject
  75.  
  76.  
  77. BUGCHECK_CODE:  c4
  78.  
  79. BUGCHECK_P1: b9
  80.  
  81. BUGCHECK_P2: 1ffd7440d00
  82.  
  83. BUGCHECK_P3: ffffe68dc2f46f40
  84.  
  85. BUGCHECK_P4: 0
  86.  
  87. BLACKBOXBSD: 1 (!blackboxbsd)
  88.  
  89.  
  90. BLACKBOXNTFS: 1 (!blackboxntfs)
  91.  
  92.  
  93. BLACKBOXWINLOGON: 1
  94.  
  95. PROCESS_NAME:  git.exe
  96.  
  97. STACK_TEXT:  
  98. ffffe58f`88a04f18 fffff800`31de3e44 : 00000000`000000c4 00000000`000000b9 000001ff`d7440d00 ffffe68d`c2f46f40 : nt!KeBugCheckEx
  99. ffffe58f`88a04f20 fffff800`31dfa343 : ffffe68d`c2f46f40 ffffe68d`b9eaed80 00000000`00011cff 000001ff`d7440d00 : nt!VerifierBugCheckIfAppropriate+0xe0
  100. ffffe58f`88a04f60 fffff803`022d8a9f : ffffe68d`c2feaa80 fffff803`022efee0 00000000`00000007 ffff8000`00000000 : nt!VerifierMmUnmapLockedPages+0x173
  101. ffffe58f`88a04fd0 fffff803`022d5bd3 : ffffe68d`c2d40e30 ffff9d05`0000005a 000001ff`d6c34000 000001ff`d724c170 : nfs41_driver!nfs41_UpcallDestroy+0x9f [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_updowncall.c @ 445]
  102. ffffe58f`88a05030 fffff803`022f9844 : ffffe68d`c2feaa80 ffffe68d`b9eaed80 ffffe68d`c2feaa80 00000000`00000000 : nfs41_driver!nfs41_Read+0x3d3 [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_readwrite.c @ 329]
  103. ffffe58f`88a050f0 fffff803`02308cd9 : ffff9d05`1b216a40 00000000`00000000 ffffe68d`b9eaed80 fffff800`31de4fe0 : nfs41_driver!RxLowIoSubmit+0x2d4 [base\fs\rdr2\rxce\lowio.c @ 805]
  104. ffffe58f`88a05150 fffff803`02308a50 : ffffe68d`c2feaa80 00000000`00000024 00000000`00000001 00000000`00000001 : nfs41_driver!RxLowIoReadShell+0x99 [base\fs\rdr2\rdbss\read.c @ 1341]
  105. ffffe58f`88a051a0 fffff803`022df0b2 : ffffe68d`c2feaa80 ffffe68d`b9eaed80 ffffe68d`bc599000 00000000`00000000 : nfs41_driver!RxCommonRead+0xcd0 [base\fs\rdr2\rdbss\read.c @ 949]
  106. ffffe58f`88a052f0 fffff803`022fc96d : fffff803`022ef160 00000000`00000000 00000000`00000000 ffffe68d`bc599090 : nfs41_driver!RxFsdCommonDispatch+0x442 [base\fs\rdr2\rdbss\ntfsd.c @ 848]
  107. ffffe58f`88a053f0 fffff803`022c8907 : ffffe68d`b9eaed80 ffffe68d`b9eaeee0 00000000`00400000 ffffe68d`b9ce7c01 : nfs41_driver!RxFsdDispatch+0xfd [base\fs\rdr2\rdbss\ntfsd.c @ 442]
  108. ffffe58f`88a05420 fffff800`317819c7 : ffffe68d`bc599090 ffffe68d`b9eaed80 ffffe68d`00000000 ffffe68d`00000000 : nfs41_driver!nfs41_FsdDispatch+0x67 [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_driver.c @ 981]
  109. ffffe58f`88a05460 fffff800`31dd7f2a : ffffe68d`b9eaed80 ffffe68d`bc599090 ffffe68d`c3540590 fffff800`3343192f : nt!IopfCallDriver+0x53
  110. ffffe58f`88a054a0 fffff800`3183839b : ffffe68d`c2b658b0 ffffe68d`b9eaed80 ffffe68d`c1051730 ffffe68d`c3892910 : nt!IovCallDriver+0x266
  111. ffffe58f`88a054e0 fffff800`33fdf243 : fffff800`33fd8000 00000000`00000000 ffffe68d`b9b3ca70 ffffe68d`b9cfb138 : nt!IofCallDriver+0x20730b
  112. ffffe58f`88a05520 fffff800`33fded99 : ffff9d05`1b335d80 00000000`00000000 fffff800`33fd8000 00000000`00000000 : mup!MupiCallUncProvider+0xb3
  113. ffffe58f`88a05590 fffff800`33fdecce : ffffe68d`b9eaed80 ffffe68d`b9cfb130 ffffe68d`c3540590 00000000`00000000 : mup!MupStateMachine+0x59
  114. ffffe58f`88a055c0 fffff800`317819c7 : 00000000`00000000 00000000`00000000 ffffe68d`c2b658b0 ffffe68d`00000000 : mup!MupFsdIrpPassThrough+0x17e
  115. ffffe58f`88a05630 fffff800`31dd7f2a : ffffe68d`b9eaed80 ffffe68d`b9b3ca70 ffffe58f`88a05700 00000000`00000003 : nt!IopfCallDriver+0x53
  116. ffffe58f`88a05670 fffff800`3183839b : ffffe68d`c386fa20 00000000`00000000 00000000`00000000 ffffe68d`c38a0950 : nt!IovCallDriver+0x266
  117. ffffe58f`88a056b0 fffff800`3272710a : 00000000`00000006 00000000`00000000 ffffe68d`b9eaed80 ffffe68d`c3475570 : nt!IofCallDriver+0x20730b
  118. ffffe58f`88a056f0 fffff800`32724a43 : ffffe58f`88a05780 ffffe68d`b9ce7cc0 00000000`00000000 00000000`00000000 : FLTMGR!FltpLegacyProcessingAfterPreCallbacksCompleted+0x28a
  119. ffffe58f`88a05760 fffff800`317819c7 : ffffe68d`b9eaed80 fffff800`31de41be ffffe68d`00000001 ffffe68d`00000000 : FLTMGR!FltpDispatch+0xa3
  120. ffffe58f`88a057c0 fffff800`31dd7f2a : ffffe68d`b9eaed80 ffffe68d`b9ce7cc0 ffffe68d`b9eaed80 fffff800`31df4a6f : nt!IopfCallDriver+0x53
  121. ffffe58f`88a05800 fffff800`3183839b : 00000000`00000000 ffffe68d`c3540590 00000000`00000000 ffffe68d`c389a490 : nt!IovCallDriver+0x266
  122. ffffe58f`88a05840 fffff800`31a18ad1 : 00000000`00000000 00000000`00000000 ffffe68d`c3540590 fffff800`31dd78c1 : nt!IofCallDriver+0x20730b
  123. ffffe58f`88a05880 fffff800`319e1ae4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!IopSynchronousServiceTail+0x361
  124. ffffe58f`88a05920 fffff800`31a15ae6 : ffffe68d`c3540590 00000000`00000000 00000000`00000000 00000000`00000000 : nt!IopReadFile+0x7cc
  125. ffffe58f`88a05a10 fffff800`31823e05 : ffffe68d`c1051080 ffffe58f`88a05b80 00000007`ffffb648 00007ff9`00000008 : nt!NtReadFile+0xa6
  126. ffffe58f`88a05a90 00007ff9`57c8d5b4 : 00007ff9`2ab7617c 00000007`ffffbaf8 00007ff9`2ab9002f 00000007`00000000 : nt!KiSystemServiceCopyEnd+0x25
  127. 00000007`ffffb628 00007ff9`2ab7617c : 00000007`ffffbaf8 00007ff9`2ab9002f 00000007`00000000 00000000`00000001 : ntdll!NtReadFile+0x14
  128. 00000007`ffffb630 00007ff9`2ab7589c : 0000000a`00001348 00000007`ffffce00 00000007`ffffb828 00000000`00000024 : cygwin1!cuserid+0x14be1
  129. 00000007`ffffb6d0 00007ff9`2ab4c7bd : 00000000`00000005 00000000`00000005 00000000`00000000 00000008`0000f980 : cygwin1!cuserid+0x14301
  130. 00000007`ffffb750 00007ff9`2ac65f73 : 0000000a`00000005 0000000a`00012d00 00000000`00010000 00000000`00000000 : cygwin1!getppid+0x43f
  131. 00000007`ffffb7e0 0000000a`00000005 : 0000000a`00012d00 00000000`00010000 00000000`00000000 00007ff9`2ab20c4a : cygwin1!localeconv+0x1363
  132. 00000007`ffffb7e8 0000000a`00012d00 : 00000000`00010000 00000000`00000000 00007ff9`2ab20c4a 0000000a`00001348 : 0x0000000a`00000005
  133. 00000007`ffffb7f0 00000000`00010000 : 00000000`00000000 00007ff9`2ab20c4a 0000000a`00001348 00000007`ffffce00 : 0x0000000a`00012d00
  134. 00000007`ffffb7f8 00000000`00000000 : 00007ff9`2ab20c4a 0000000a`00001348 00000007`ffffce00 00007ff9`2ac56021 : 0x10000
  135.  
  136.  
  137. FAULTING_SOURCE_LINE:  C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_updowncall.c
  138.  
  139. FAULTING_SOURCE_FILE:  C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_updowncall.c
  140.  
  141. FAULTING_SOURCE_LINE_NUMBER:  445
  142.  
  143. SYMBOL_NAME:  nfs41_driver!nfs41_UpcallDestroy+9f
  144.  
  145. MODULE_NAME: nfs41_driver
  146.  
  147. IMAGE_NAME:  nfs41_driver.sys
  148.  
  149. STACK_COMMAND:  .thread ; .cxr ; kb
  150.  
  151. BUCKET_ID_FUNC_OFFSET:  9f
  152.  
  153. FAILURE_BUCKET_ID:  0xc4_b9_VRF_nfs41_driver!nfs41_UpcallDestroy
  154.  
  155. OS_VERSION:  10.0.19041.1
  156.  
  157. BUILDLAB_STR:  vb_release
  158.  
  159. OSPLATFORM_TYPE:  x64
  160.  
  161. OSNAME:  Windows 10
  162.  
  163. FAILURE_ID_HASH:  {34d4b5fc-edc9-67e4-e4a9-2e4a154cdaa8}
  164.  
  165. Followup:     MachineOwner
  166. ---------
  167.  
  168. 2: kd> kp
  169.  # Child-SP          RetAddr           Call Site
  170. 00 ffffe58f`88a04f18 fffff800`31de3e44 nt!KeBugCheckEx
  171. 01 ffffe58f`88a04f20 fffff800`31dfa343 nt!VerifierBugCheckIfAppropriate+0xe0
  172. 02 ffffe58f`88a04f60 fffff803`022d8a9f nt!VerifierMmUnmapLockedPages+0x173
  173. 03 ffffe58f`88a04fd0 fffff803`022d5bd3 nfs41_driver!nfs41_UpcallDestroy(struct _updowncall_entry * entry = 0xffffe68d`c2d40e30)+0x9f [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_updowncall.c @ 445]
  174. 04 ffffe58f`88a05030 fffff803`022f9844 nfs41_driver!nfs41_Read(struct _RX_CONTEXT * RxContext = 0xffffe68d`c2feaa80)+0x3d3 [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_readwrite.c @ 329]
  175. 05 ffffe58f`88a050f0 fffff803`02308cd9 nfs41_driver!RxLowIoSubmit(struct _RX_CONTEXT * RxContext = 0xffffe68d`c2feaa80, struct _IRP * Irp = 0xffffe68d`b9eaed80, struct _FCB * Fcb = 0xffff9d05`1b216a40, <function> * CompletionRoutine = 0xffffe68d`c2f46f40)+0x2d4 [base\fs\rdr2\rxce\lowio.c @ 805]
  176. 06 ffffe58f`88a05150 fffff803`02308a50 nfs41_driver!RxLowIoReadShell(struct _RX_CONTEXT * RxContext = 0xffffe68d`c2feaa80, struct _IRP * Irp = 0xffffe68d`b9eaed80, struct _FCB * Fcb = 0xffff9d05`1b216a40)+0x99 [base\fs\rdr2\rdbss\read.c @ 1341]
  177. 07 ffffe58f`88a051a0 fffff803`022df0b2 nfs41_driver!RxCommonRead(struct _RX_CONTEXT * RxContext = 0xffffe68d`c2feaa80, struct _IRP * Irp = 0xffffe68d`b9eaed80)+0xcd0 [base\fs\rdr2\rdbss\read.c @ 949]
  178. 08 ffffe58f`88a052f0 fffff803`022fc96d nfs41_driver!RxFsdCommonDispatch(struct _RX_FSD_DISPATCH_VECTOR * DispatchVector = 0xfffff803`022ef160, struct _IRP * Irp = 0xffffe68d`b9eaed80, struct _FILE_OBJECT * FileObject = 0x00000000`00000000, struct _RDBSS_DEVICE_OBJECT * RxDeviceObject = 0xffffe68d`bc599090)+0x442 [base\fs\rdr2\rdbss\ntfsd.c @ 848]
  179. 09 ffffe58f`88a053f0 fffff803`022c8907 nfs41_driver!RxFsdDispatch(struct _RDBSS_DEVICE_OBJECT * RxDeviceObject = <Value unavailable error>, struct _IRP * Irp = <Value unavailable error>)+0xfd [base\fs\rdr2\rdbss\ntfsd.c @ 442]
  180. 0a ffffe58f`88a05420 fffff800`317819c7 nfs41_driver!nfs41_FsdDispatch(struct _DEVICE_OBJECT * dev = 0xffffe68d`bc599090 Device for "\FileSystem\nfs41_driver", struct _IRP * Irp = 0xffffe68d`b9eaed80)+0x67 [C:\cygwin64\home\roland_mainz\work\msnfs41_uidmapping\ms-nfs41-client\sys\nfs41sys_driver.c @ 981]
  181. 0b ffffe58f`88a05460 fffff800`31dd7f2a nt!IopfCallDriver+0x53
  182. 0c ffffe58f`88a054a0 fffff800`3183839b nt!IovCallDriver+0x266
  183. 0d ffffe58f`88a054e0 fffff800`33fdf243 nt!IofCallDriver+0x20730b
  184. 0e ffffe58f`88a05520 fffff800`33fded99 mup!MupiCallUncProvider+0xb3
  185. 0f ffffe58f`88a05590 fffff800`33fdecce mup!MupStateMachine+0x59
  186. 10 ffffe58f`88a055c0 fffff800`317819c7 mup!MupFsdIrpPassThrough+0x17e
  187. 11 ffffe58f`88a05630 fffff800`31dd7f2a nt!IopfCallDriver+0x53
  188. 12 ffffe58f`88a05670 fffff800`3183839b nt!IovCallDriver+0x266
  189. 13 ffffe58f`88a056b0 fffff800`3272710a nt!IofCallDriver+0x20730b
  190. 14 ffffe58f`88a056f0 fffff800`32724a43 FLTMGR!FltpLegacyProcessingAfterPreCallbacksCompleted+0x28a
  191. 15 ffffe58f`88a05760 fffff800`317819c7 FLTMGR!FltpDispatch+0xa3
  192. 16 ffffe58f`88a057c0 fffff800`31dd7f2a nt!IopfCallDriver+0x53
  193. 17 ffffe58f`88a05800 fffff800`3183839b nt!IovCallDriver+0x266
  194. 18 ffffe58f`88a05840 fffff800`31a18ad1 nt!IofCallDriver+0x20730b
  195. 19 ffffe58f`88a05880 fffff800`319e1ae4 nt!IopSynchronousServiceTail+0x361
  196. 1a ffffe58f`88a05920 fffff800`31a15ae6 nt!IopReadFile+0x7cc
  197. 1b ffffe58f`88a05a10 fffff800`31823e05 nt!NtReadFile+0xa6
  198. 1c ffffe58f`88a05a90 00007ff9`57c8d5b4 nt!KiSystemServiceCopyEnd+0x25
  199. 1d 00000007`ffffb628 00007ff9`2ab7617c ntdll!NtReadFile+0x14
  200. 1e 00000007`ffffb630 00007ff9`2ab7589c cygwin1!cuserid+0x14be1
  201. 1f 00000007`ffffb6d0 00007ff9`2ab4c7bd cygwin1!cuserid+0x14301
  202. 20 00000007`ffffb750 00007ff9`2ac65f73 cygwin1!getppid+0x43f
  203. 21 00000007`ffffb7e0 0000000a`00000005 cygwin1!localeconv+0x1363
  204. 22 00000007`ffffb7e8 0000000a`00012d00 0x0000000a`00000005
  205. 23 00000007`ffffb7f0 00000000`00010000 0x0000000a`00012d00
  206. 24 00000007`ffffb7f8 00000000`00000000 0x10000
  207. 2: kd> dx -r1 ((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)
  208. ((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)                 : 0xffffe68dc2d40e30 [Type: _updowncall_entry *]
  209.     [+0x000] version          : 0x23d9b [Type: unsigned long]
  210.     [+0x008] xid              : 1557 [Type: __int64]
  211.     [+0x010] opcode           : NFS41_SYSOP_READ (5) [Type: _nfs41_opcodes]
  212.     [+0x014] status           : 38 [Type: long]
  213.     [+0x018] state            : NFS41_DONE_PROCESSING (2) [Type: _nfs41_updowncall_state]
  214.     [+0x020] lock             [Type: _FAST_MUTEX]
  215.     [+0x058] next             [Type: _LIST_ENTRY]
  216.     [+0x068] cond             [Type: _KEVENT]
  217.     [+0x080] errno            : 0x0 [Type: unsigned long]
  218.     [+0x084] async_op         : 0x0 [Type: unsigned char]
  219.     [+0x088] sec_ctx          [Type: _SECURITY_CLIENT_CONTEXT]
  220.     [+0x0d0] psec_ctx         : 0xffff9d051b220f90 [Type: _SECURITY_CLIENT_CONTEXT *]
  221.     [+0x0d8] psec_ctx_clienttoken : 0xffff9d05248b07f0 [Type: void *]
  222.     [+0x0e0] open_state       : 0x1ffd724c170 [Type: void *]
  223.     [+0x0e8] session          : 0x1ffd6c34000 [Type: void *]
  224.     [+0x0f0] filename         : 0xffff9d051b216b60 : "\bigdisk\builds\bash_build1\bash\.git\config" [Type: _UNICODE_STRING *]
  225.     [+0x0f8] buf              : 0x1ffd7440d00 [Type: void *]
  226.     [+0x100] buf_len          : 0x10000 [Type: unsigned long]
  227.     [+0x108] ChangeTime       : 0x0 [Type: unsigned __int64]
  228.     [+0x110] u                [Type: <unnamed-tag>]
  229. 2: kd> dx -r1 (*((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)).u
  230. (*((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)).u [Type: <unnamed-tag>]
  231.     [+0x000] Mount            [Type: <unnamed-tag>]
  232.     [+0x000] ReadWrite        [Type: <unnamed-tag>]
  233.     [+0x000] Lock             [Type: <unnamed-tag>]
  234.     [+0x000] Unlock           [Type: <unnamed-tag>]
  235.     [+0x000] Open             [Type: <unnamed-tag>]
  236.     [+0x000] Close            [Type: <unnamed-tag>]
  237.     [+0x000] QueryFile        [Type: <unnamed-tag>]
  238.     [+0x000] SetFile          [Type: <unnamed-tag>]
  239.     [+0x000] SetEa            [Type: <unnamed-tag>]
  240.     [+0x000] QueryEa          [Type: <unnamed-tag>]
  241.     [+0x000] Symlink          [Type: <unnamed-tag>]
  242.     [+0x000] Volume           [Type: <unnamed-tag>]
  243.     [+0x000] Acl              [Type: <unnamed-tag>]
  244.     [+0x000] QueryAllocatedRanges [Type: <unnamed-tag>]
  245.     [+0x000] SetZeroData      [Type: <unnamed-tag>]
  246.     [+0x000] DuplicateData    [Type: <unnamed-tag>]
  247. 2: kd> dx -r1 (*((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)).u.ReadWrite
  248. (*((nfs41_driver!_updowncall_entry *)0xffffe68dc2d40e30)).u.ReadWrite [Type: <unnamed-tag>]
  249.     [+0x000] MdlAddress       : 0xffffe68dc2f46f40 [Type: _MDL *]
  250.     [+0x008] offset           : 0x24 [Type: unsigned __int64]
  251.     [+0x010] rxcontext        : 0x0 [Type: _RX_CONTEXT *]

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