0: kd> !irp ffffe001ce52b720
Irp is active with 20 stacks 17 is current (= 0xffffe001ce52bc70)
No Mdl: No System Buffer: Thread ffffe001cd3f5040: 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
[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
[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_INTERNAL_DEVICE_CONTROL(f), N/A(0)] //IRP is pending here
0 1 ffffe001ce3551f0 00000000 00000000-00000000 pending
\Driver\USBXHCI
Args: ffffcf8055ec2f60 00000000 00220003 ffffe001ce4e14e0
[IRP_MJ_INTERNAL_DEVICE_CONTROL(f), N/A(0)]
0 e0 ffffe001ce3fae20 00000000 00000000-00000000
\Driver\USBXHCI
Args: ffffcf8055ec2f60 00000000 00220003 ffffe001ce4e14e0
[IRP_MJ_INTERNAL_DEVICE_CONTROL(f), N/A(0)]
0 e1 ffffe001ce3fae20 00000000 00000000-00000000 pending
\Driver\USBXHCI
Args: ffffcf8055ec2f60 00000000 00220003 ffffe001ce4e14e0
[IRP_MJ_INTERNAL_DEVICE_CONTROL(f), N/A(0)]
0 e0 ffffe001ce4c0380 00000000 fffff8018ef6284c-ffffd00020b9bdb0 Success Error Cancel
Page 104099 not present in the dump file. Type ".hh dbgerr004" for details
\Driver\USBHUB3 lvuvc64!calloc
Args: ffffcf8055ec2f60 00000000 00220003 ffffe001ce4e14e0
0: kd> !devstack ffffe001ce4e5b20
!DevObj !DrvObj !DevExt ObjectName
ffffe001ce4e6060 \Driver\ksthunk ffffe001ce4e61b0 00000049
> ffffe001ce4e5b20 \Driver\LVUVC64 ffffe001ce4e5c90
ffffe001ce4e3060 \Driver\usbccgp ffffe001ce4e31b0 00000047
!DevNode ffffe001ce4e2880 :
DeviceInst is "USB\VID_046D&PID_09A1&MI_00\7&12e6e5da&0&0000"
ServiceName is "LVUVC64" // Logitech USB camera
0: kd> !devstack ffffe001ce4c0380
!DevObj !DrvObj !DevExt ObjectName
ffffe001ce4cb060 \Driver\usbccgp ffffe001ce4cb1b0 00000046
> ffffe001ce4c0380 \Driver\USBHUB3 ffffe001ce4bf850 USBPDO-9
!DevNode ffffe001ce4c4010 :
DeviceInst is "USB\VID_046D&PID_09A1\B5471720"
ServiceName is "usbccgp" //USB generic parent driver
0: kd> !drvobj \Driver\USBHUB3 //USB 3.0 hub driver object
Driver object (ffffe001ce776ac0) is for:
\Driver\USBHUB3
Driver Extension List: (id , addr)
(fffff8018b13e0b0 ffffe001cf247150)
Device Object list:
ffffe001ce530060 ffffe001ce52b060 ffffe001ce4c6e20 ffffe001ce4c0380
ffffe001ce4bee20 ffffe001ce422310 ffffe001ceed5cb0 ffffe001ceec5d50
ffffe001ceed6060 ffffe001cf3eba00 //All the attached devices, including the USB 3.0 Host Controller
//Memory referenced
0: kd> !pte ffffcf8054cf8fc0
VA ffffcf8054cf8fc0
PXE at FFFFF6FB7DBEDCF8 PPE at FFFFF6FB7DB9F008 PDE at FFFFF6FB73E01530 PTE at FFFFF6E7C02A67C0
contains 0000000004D18863 contains 0000000100017863 contains 0000000100131863 contains 800000010A7B9882
pfn 4d18 ---DA--KWEV pfn 100017 ---DA--KWEV pfn 100131 ---DA--KWEV not valid
Transition: 10a7b9 //Transition page, meaning it is still valid, but paged out from the working set
Protect: 4 - ReadWrite
0: kd> !pfn 10a7b9
PFN 0010A7B9 at address FFFFFA80031F72B0
flink 0010B6B3 blink / share count 000034BE pteaddress FFFFF6E7C02A67C0
nt!_MMPFNENTRY type not found
reference count 0000 used entry count 0000 NonCached color 0 Priority 0
restore pte 00000080 containing page 100131 nt!_MMPFNENTRY type not found //Not exactly helpful
0: kd> knL
*** Stack trace for last set context - .thread/.cxr resets it
# Child-SP RetAddr Call Site
00 ffffd000`20b9b970 fffff802`c2868fcf nt!KiSwapContext+0x76
01 ffffd000`20b9bab0 fffff802`c2868aa3 nt!KiSwapThread+0x15f
02 ffffd000`20b9bb70 fffff802`c2868727 nt!KiCommitThreadWait+0x153
03 ffffd000`20b9bc10 fffff802`c2eca2ea nt!KeWaitForSingleObject+0x387
04 ffffd000`20b9bcc0 fffff802`c2ec9876 nt!ViKeWaitForSingleObjectCommon+0x92
05 ffffd000`20b9bd10 fffff801`8ef4dfef nt!VerifierKeWaitForSingleObject+0x1e
06 ffffd000`20b9bd50 fffff801`8ef4e981 lvuvc64!calloc+0x2d6a3
07 ffffd000`20b9be30 fffff801`8ef4ed4a lvuvc64!calloc+0x2e035
08 ffffd000`20b9beb0 fffff801`8ef4cc2f lvuvc64!calloc+0x2e3fe
09 ffffd000`20b9bf60 fffff801`8ef5ee30 lvuvc64!calloc+0x2c2e3
0a ffffd000`20b9bfb0 fffff801`8ef757d5 lvuvc64!calloc+0x3e4e4
0b ffffd000`20b9bfe0 fffff801`8ef739d4 lvuvc64!cvSetErrMode+0x21cd
0c ffffd000`20b9c040 fffff801`8ef748c3 lvuvc64!cvSetErrMode+0x3cc
0d ffffd000`20b9c0c0 fffff801`8ef36475 lvuvc64!cvSetErrMode+0x12bb
0e ffffd000`20b9c130 fffff801`8ef37e43 lvuvc64!calloc+0x15b29
0f ffffd000`20b9c1c0 fffff801`8ef38239 lvuvc64!calloc+0x174f7
10 ffffd000`20b9c260 fffff801`8ef205f1 lvuvc64!calloc+0x178ed
11 ffffd000`20b9c2f0 fffff801`8ed8b568 lvuvc64+0x5f1
Page 102418 not present in the dump file. Type ".hh dbgerr004" for details
12 ffffd000`20b9c320 fffff801`8ed82334 ks!CKsDevice::PnpStart+0x8794
Page 102418 not present in the dump file. Type ".hh dbgerr004" for details
Page 10248f not present in the dump file. Type ".hh dbgerr004" for details
13 ffffd000`20b9c370 fffff801`8ef616c4 ks!CKsDevice::DispatchPnp+0x104
Page 10248f not present in the dump file. Type ".hh dbgerr004" for details
14 ffffd000`20b9c3e0 fffff801`8b05e030 lvuvc64!calloc+0x40d78
15 ffffd000`20b9c410 fffff802`c2eb7eb6 VerifierExt!xdv_IRP_MJ_PNP_wrapper+0xe0
16 ffffd000`20b9c470 fffff802`c2858ff2 nt!IovCallDriver+0x252
17 ffffd000`20b9c4b0 fffff801`8cd514b1 nt!IofCallDriver+0x72
18 ffffd000`20b9c4f0 fffff802`c2eb7eb6 ksthunk!CKernelFilterDevice::DispatchIrp+0xf9
19 ffffd000`20b9c550 fffff802`c2858ff2 nt!IovCallDriver+0x252
1a ffffd000`20b9c590 fffff802`c2c201e9 nt!IofCallDriver+0x72
1b ffffd000`20b9c5d0 fffff802`c2822c68 nt!PnpAsynchronousCall+0xe5
1c ffffd000`20b9c610 fffff802`c2822790 nt!PnpSendIrp+0x54
1d ffffd000`20b9c680 fffff802`c2c1f4f7 nt!PnpStartDevice+0x88
1e ffffd000`20b9c710 fffff802`c2c1f153 nt!PnpStartDeviceNode+0xdb
1f ffffd000`20b9c7a0 fffff802`c2c08162 nt!PipProcessStartPhase1+0x53
20 ffffd000`20b9c7e0 fffff802`c2bfe745 nt!PipProcessDevNodeTree+0x402
21 ffffd000`20b9ca60 fffff802`c28eb802 nt!PiProcessReenumeration+0xa1
22 ffffd000`20b9cab0 fffff802`c284f1e9 nt!PnpDeviceActionWorker+0x166
23 ffffd000`20b9cb80 fffff802`c2807d85 nt!ExpWorkerThread+0xe9
24 ffffd000`20b9cc10 fffff802`c2942366 nt!PspSystemThreadStartup+0x41
25 ffffd000`20b9cc60 00000000`00000000 nt!KiStartSystemThread+0x16
Irp worker threads (PopIrpThreadList - fffff802c2add0c0)
THREAD: ffffe001cbb05040 (static)
THREAD: ffffe001cbb04040 (static)
//The thread we saw was indeed an IRP worker thread.
0: kd> !podev ffffe001ce4e5b20
Device object is for:
DriverObject ce4db930
Current Irp 00000000 RefCount 0 Type 0000002f AttachedDev ffffe001ce4e6060 DevFlags 00002000 DO_POWER_PAGABLE //IRP flag indicating the device is pagable
Device queue is not busy.
Device Object Extension: ffffe001ce4e5c98:
PowerFlags: 00000000 =>SystemState=0 DeviceState=0
Dope: 00000000: