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    Unfortunately it is impossible to say from the stack only what
    exactly the BcmBusCtr is waiting for. <br>
    Could you upload this dump to our ftp server so that I could have a
    look into it?<br>
    <br>
    I will post you our ftp server details privately.<br>
    <br>
    Thanks,<br>
    Mikhail<br>
    <br>
    On 14.03.2012 22:01, Ribhi Kamal wrote:
    <blockquote
cite="mid:CACkSh6wYBK25EpdYt4Am8XaWzY15VBwj=aCPv-oQ9CnhzjHB4Q@mail.gmail.com"
      type="cite">
      <div>Thanks for the help! Below is the stack trace. I'm still
        working on setting up windbg on another machine.</div>
      <div><br>
      </div>
      <div>Note: BcmBusCtr is the USB hub that is causing the trouble.
        It is possible that the device is not behaving correctly so I
        starting to lean towards making the hubWalker skip the device
        all together. But I would rather find a real solution since this
        problem will happen with other devices as well.</div>
      <div><br>
      </div>
      <div>
        <div>                            [888152d8 VirtualBox.exe]</div>
        <div><br>
        </div>
        <div>                            [853f7448 VBoxSVC.exe]</div>
        <div>*** ERROR: Module load completed but symbols could not be
          loaded for BcmBusCtr.sys</div>
        <div> ea4.000eb8  8807d030 0003c0b Blocked  
           nt!KiSwapContext+0x26</div>
        <div>                                       
          nt!KiSwapThread+0x266</div>
        <div>                                       
          nt!KiCommitThreadWait+0x1df</div>
        <div>                                       
          nt!KeWaitForSingleObject+0x393</div>
        <div>                                        BcmBusCtr+0x6127</div>
        <div>                                       
          nt!IofCallDriver+0x63</div>
        <div>
                                                 
          nt!IopParseDevice+0xed7</div>
        <div>                                       
          nt!ObpLookupObjectName+0x4fa</div>
        <div>                                       
          nt!ObOpenObjectByName+0x165</div>
        <div>                                       
          nt!IopCreateFile+0x673</div>
        <div>                                        nt!NtOpenFile+0x2a</div>
        <div>                                       
          nt!KiFastCallEntry+0x12a</div>
        <div>
                                                  nt!ZwOpenFile+0x11</div>
        <div>                                       
          nt!IoGetDeviceObjectPointer+0x59</div>
        <div>                                       
          VBoxUSBMon!vboxUsbMonHubDevWalk+0x831</div>
        <div>                                       
          VBoxUSBMon!VBoxUsbFltFilterCheck+0x4c2</div>
        <div>                                       
          VBoxUSBMon!VBoxUsbMonRunFilters+0x16f</div>
        <div>                                       
          VBoxUSBMon!vboxUsbMonIoctlDispatch+0x1374</div>
        <div>                                       
          VBoxUSBMon!VBoxUsbMonDeviceControl+0xe38</div>
        <div>                                       
          nt!IofCallDriver+0x63</div>
        <div>                                       
          nt!IopSynchronousServiceTail+0x1f8</div>
        <div>                                       
          nt!IopXxxControlFile+0x6aa</div>
        <div>                                       
          nt!NtDeviceIoControlFile+0x2a</div>
        <div>                                       
          nt!KiFastCallEntry+0x12a</div>
        <div>                                       
          ntdll!KiFastSystemCallRet</div>
      </div>
      <div><br>
      </div>
      <br>
      <div class="gmail_quote">On Wed, Mar 14, 2012 at 6:52 AM, mikhail
        sennikovsky <span dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:mikhail.sennikovsky@oracle.com">mikhail.sennikovsky@oracle.com</a>&gt;</span>
        wrote:<br>
        <blockquote class="gmail_quote" style="margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">
          <div bgcolor="#FFFFFF" text="#000000"> One thing you might try
            is to make your host system BSOD and generate a full or
            kernel memory dump once you are sure
            IoGetDeviceObjectPointer is deadlocked for you.<br>
            You will be able then to open the crash dump and find and
            analyze the deadlocked thread.<br>
            <br>
            See <a moz-do-not-send="true"
              href="http://support.microsoft.com/kb/244139"
              target="_blank">http://support.microsoft.com/kb/244139</a>
            on how to make the system generate a dump for you.<br>
            <br>
            Note that you'd need a full dump or kernel memory dump, not
            a minidump. My Computer -&gt; properties -&gt; advanced
            system settings -&gt; "Startup and recovery" settings.<br>
            <br>
            Once  you have a dump and opened it with WinDbg, :<br>
            in WinDbg cmd console: !stacks 2 VBoxUsbMon! -&gt; will give
            you a list of threads VBoxUsbMon is involved in<br>
            select the deadlocked thread with .thread
            &lt;thread_address&gt;<br>
            you can then do k, .frame, or whatever you need on that
            thread. It would be great if you could post a stack trace
            for that thread here.<span class="HOEnZb"><font
                color="#888888"><br>
                <br>
                Mikhail</font></span>
            <div>
              <div class="h5"><br>
                <br>
                On 14.03.2012 1:43, Huihong Luo wrote:
                <blockquote type="cite">
                  <table border="0" cellpadding="0" cellspacing="0">
                    <tbody>
                      <tr>
                        <td style="font:inherit" valign="top">sorry,
                          just realized that you are debugging host
                          drivers. Yes, you will have to use 2 physical
                          pcs.<br>
                          <br>
                          --- On <b>Tue, 3/13/12, Huihong Luo <i><a
                                moz-do-not-send="true"
                                href="mailto:huisinro@yahoo.com"
                                target="_blank">&lt;huisinro@yahoo.com&gt;</a></i></b>
                          wrote:<br>
                          <blockquote style="BORDER-LEFT:rgb(16,16,255)
                            2px solid;PADDING-LEFT:5px;MARGIN-LEFT:5px"><br>
                            From: Huihong Luo <a moz-do-not-send="true"
                              href="mailto:huisinro@yahoo.com"
                              target="_blank">&lt;huisinro@yahoo.com&gt;</a><br>
                            Subject: Re: [vbox-dev]
                            IoGetDeviceObjectPointer hangs vboxusbmon<br>
                            To: "Ribhi Kamal" <a moz-do-not-send="true"
                              href="mailto:rbhkamal@gmail.com"
                              target="_blank">&lt;rbhkamal@gmail.com&gt;</a><br>
                            Cc: "vbox-dev" <a moz-do-not-send="true"
                              href="mailto:vbox-dev@virtualbox.org"
                              target="_blank">&lt;vbox-dev@virtualbox.org&gt;</a><br>
                            Date: Tuesday, March 13, 2012, 2:41 PM<br>
                            <br>
                            <div>
                              <table border="0" cellpadding="0"
                                cellspacing="0">
                                <tbody>
                                  <tr>
                                    <td valign="top">
                                      <div>do you mean you need 2 pcs to
                                        debug?</div>
                                      <div> </div>
                                      <div>no, you can use same pc. Just
                                        run vm on the same pc, and
                                        configure COM1 as pipe. Then
                                        start windbg this way:</div>
                                      <div><br>
                                        C:\WinDDK\7600.16385.0\Debuggers\windbg.exe

                                        -b -k
                                        com:pipe,port=\\.\pipe\com_1,resets=0</div>
                                      <div><br>
                                        --- On <b>Tue, 3/13/12, Ribhi
                                          Kamal <i><a
                                              moz-do-not-send="true"
                                              href="mailto:rbhkamal@gmail.com"
                                              target="_blank">&lt;rbhkamal@gmail.com&gt;</a></i></b>
                                        wrote:<br>
                                      </div>
                                      <blockquote
                                        style="BORDER-LEFT:rgb(16,16,255)
                                        2px
                                        solid;PADDING-LEFT:5px;MARGIN-LEFT:5px"><br>
                                        From: Ribhi Kamal <a
                                          moz-do-not-send="true"
                                          href="mailto:rbhkamal@gmail.com"
                                          target="_blank">&lt;rbhkamal@gmail.com&gt;</a><br>
                                        Subject: Re: [vbox-dev]
                                        IoGetDeviceObjectPointer hangs
                                        vboxusbmon<br>
                                        To: "Huihong Luo" <a
                                          moz-do-not-send="true"
                                          href="mailto:huisinro@yahoo.com"
                                          target="_blank">&lt;huisinro@yahoo.com&gt;</a><br>
                                        Cc: "vbox-dev" <a
                                          moz-do-not-send="true"
                                          href="mailto:vbox-dev@virtualbox.org"
                                          target="_blank">&lt;vbox-dev@virtualbox.org&gt;</a><br>
                                        Date: Tuesday, March 13, 2012,
                                        2:38 PM<br>
                                        <br>
                                        <div>
                                          <div>Thanks, that helped me
                                            get started. Unfortunately I
                                            can't set break points when
                                            debugging locally so it
                                            is going to take me a while
                                            answer your questions. The
                                            only dev machine that I use
                                            is 100 miles away from me,
                                            so it will be very hard to
                                            attach a console/USB cable
                                            for debugging. I need to go
                                            hunt for a laptop somewhere,
                                            put windows on it then run a
                                            windbg in server mode. That
                                            way I can connect via tcp
                                            and set breakpoints.</div>
                                          <div><br>
                                            Thanks again</div>
                                          <div><br>
                                          </div>
                                          <div>
                                            <div>On Tue, Mar 13, 2012 at
                                              3:30 PM, Huihong Luo <span
                                                dir="ltr">&lt;<a
                                                  moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=huisinro@yahoo.com"
                                                  rel="nofollow"
                                                  target="_blank">huisinro@yahoo.com</a>&gt;</span>
                                              wrote:<br>
                                              <blockquote
                                                style="BORDER-LEFT:#ccc
                                                1px solid;MARGIN:0px 0px
                                                0px
                                                0.8ex;PADDING-LEFT:1ex">
                                                <table border="0"
                                                  cellpadding="0"
                                                  cellspacing="0">
                                                  <tbody>
                                                    <tr>
                                                      <td valign="top">inside

                                                        windbg, click
                                                        Disassembly
                                                        window, it will
                                                        display assembly
                                                        code, then you
                                                        can set a
                                                        breakpoint by
                                                        click the left
                                                        side of the code
                                                        line.
                                                        <div><br>
                                                          <br>
                                                          --- On <b>Tue,
                                                          3/13/12, Ribhi
                                                          Kamal <i>&lt;<a
moz-do-not-send="true"
                                                          href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;</i></b> wrote:<br>
                                                        </div>
                                                        <blockquote
                                                          style="BORDER-LEFT:rgb(16,16,255)
                                                          2px
                                                          solid;PADDING-LEFT:5px;MARGIN-LEFT:5px">
                                                          <div><br>
                                                          From: Ribhi
                                                          Kamal &lt;<a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;<br>
                                                          Subject: Re:
                                                          [vbox-dev]
                                                          IoGetDeviceObjectPointer
                                                          hangs
                                                          vboxusbmon<br>
                                                          </div>
                                                          To: "Huihong
                                                          Luo" &lt;<a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=huisinro@yahoo.com"
                                                          rel="nofollow"
target="_blank">huisinro@yahoo.com</a>&gt;<br>
                                                          Cc: "vbox-dev"
                                                          &lt;<a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=vbox-dev@virtualbox.org"
                                                          rel="nofollow"
target="_blank">vbox-dev@virtualbox.org</a>&gt;<br>
                                                          Date: Tuesday,
                                                          March 13,
                                                          2012, 12:29 PM
                                                          <div>
                                                          <div><br>
                                                          <br>
                                                          <div>The
                                                          \Device\USBPDO-11
                                                          physical
                                                          device is a
                                                          sprint hub
                                                          driver BcmBusCtr.SYS.
                                                          But I've seen
                                                          it happen with
                                                          other devices
                                                          as well (Apple
                                                          trackpad)
                                                          <div><br>
                                                          </div>
                                                          <div>Will
                                                          update you
                                                          once I get
                                                          windbg
                                                          working.</div>
                                                          <div><br>
                                                          Thanks</div>
                                                          <div><br>
                                                          <div>On Tue,
                                                          Mar 13, 2012
                                                          at 3:08 PM,
                                                          Ribhi Kamal <span
                                                          dir="ltr">&lt;<a
moz-do-not-send="true"
                                                          href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;</span> wrote:<br>
                                                          <blockquote
                                                          style="BORDER-LEFT:#ccc
                                                          1px
                                                          solid;MARGIN:0px
                                                          0px 0px
                                                          0.8ex;PADDING-LEFT:1ex">The

                                                          hubwalker
                                                          loops through
                                                          PDO devices
                                                          0-15 and it
                                                          hangs at
                                                          number 11. So
                                                          the device
                                                          name (hub
                                                          name) should
                                                          be "\Device\USBPDO-11".
                                                          Is that what
                                                          you wanted?<br>
                                                          <br>
                                                          I'm still
                                                          trying to
                                                          figure out how
                                                          to step
                                                          through
                                                          assembly code
                                                          in windbg. I
                                                          just started
                                                          windows in
                                                          debug mode and
                                                          connected
                                                          windbg.
                                                          <div><br>
                                                          </div>
                                                          <div>In the
                                                          mean time, I
                                                          found the link
                                                          below which
                                                          suggests
                                                          queuing a work
                                                          item to call
                                                          IoGetDeviceObjectPointer
                                                          using ioallocateworkitem

                                                          routine,
                                                          should I give
                                                          that a try?</div>
                                                          <div><a
                                                          moz-do-not-send="true"
href="http://www.osronline.com/article.cfm?id=24" rel="nofollow"
                                                          target="_blank">http://www.osronline.com/article.cfm?id=24</a><br>
                                                          </div>
                                                          <div><br>
                                                          </div>
                                                          <div>Here is a
                                                          little
                                                          snippet:</div>
                                                          <div
                                                          style="TEXT-ALIGN:center">
                                                          <p
                                                          style="MARGIN:0in
                                                          0in
0pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px"
                                                          align="center"><b>Figure

                                                          5 – The <u>wrong</u> way

                                                          to write a PnP
                                                          Notification
                                                          Callback</b></p>
                                                          </div>
                                                          </blockquote>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                        </blockquote>
                                                        <p
                                                          style="MARGIN:0in
                                                          0in
0pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px"
                                                          align="center"><b> </b>
                                                        </p>
                                                        <p
                                                          style="TEXT-ALIGN:justify;MARGIN:0in
                                                          0in
0pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px">And,

                                                          while you’d be
                                                          partially
                                                          right, you <i>do</i> get
                                                          a pointer to a
                                                          device object
                                                          using its name
                                                          by calling <b>IoGetDeviceObject

                                                          Pointer</b>,
                                                          you’d also get
                                                          bitten by one
                                                          of the
                                                          conditions of
                                                          PnP
                                                          Notification
                                                          routines.  As
                                                          it very
                                                          clearly states
                                                          in the
                                                          documentation:
                                                        </p>
                                                        <p
                                                          style="TEXT-ALIGN:justify;MARGIN:0in
                                                          0in
0pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px"> 
                                                        </p>
                                                        <p
                                                          style="TEXT-ALIGN:justify;MARGIN:0in
                                                          12.95pt 0pt
8.65pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px"><i>A
                                                          callback
                                                          routine must
                                                          not open the
                                                          device
                                                          directly. If
                                                          the provider
                                                          of the
                                                          interface
                                                          causes
                                                          blocking PnP
                                                          events, the
                                                          notification
                                                          callback
                                                          routine can
                                                          cause a
                                                          deadlock if it
                                                          tries to open
                                                          the device in
                                                          the callback
                                                          thread.</i> </p>
                                                        <p
                                                          style="TEXT-ALIGN:justify;MARGIN:0in
                                                          12.95pt 0pt
8.65pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px"><i> </i>
                                                        </p>
                                                        <p
                                                          style="TEXT-ALIGN:justify;MARGIN:0in
                                                          0in
0pt;FONT-FAMILY:Arial,Helvetica,sans-serif;COLOR:rgb(51,51,51);FONT-SIZE:13px">When
                                                          you call <b>IoGetDeviceObjectPointer, </b>you’re

                                                          actually
                                                          issuing an
                                                          open
                                                          (IRP_MJ_CREATE)
                                                          for the
                                                          specified
                                                          device.  That’s
                                                          why you get
                                                          back a File
                                                          Object
                                                          pointer, in
                                                          addition to
                                                          the Device
                                                          Object pointer
                                                          that you
                                                          wanted.  So,
                                                          the proper
                                                          thing to do is
                                                          queue a work
                                                          item that does
                                                          the call to <b>IoGetDeviceObjectPointer</b>,
                                                          as shown in <i>Figure
                                                          6</i>. </p>
                                                        <div><br>
                                                        </div>
                                                        <div>
                                                          <div>
                                                          <div><br>
                                                          <div>On Tue,
                                                          Mar 13, 2012
                                                          at 2:10 PM,
                                                          Huihong Luo <span
                                                          dir="ltr">&lt;<a
moz-do-not-send="true"
                                                          href="http://us.mc1603.mail.yahoo.com/mc/compose?to=huisinro@yahoo.com"
                                                          rel="nofollow"
target="_blank">huisinro@yahoo.com</a>&gt;</span> wrote:<br>
                                                          <blockquote
                                                          style="BORDER-LEFT:#ccc
                                                          1px
                                                          solid;MARGIN:0px
                                                          0px 0px
                                                          0.8ex;PADDING-LEFT:1ex">
                                                          <table
                                                          border="0"
                                                          cellpadding="0"
cellspacing="0">
                                                          <tbody>
                                                          <tr>
                                                          <td
                                                          valign="top">
                                                          <div>This api
                                                          simply returns
                                                          a device
                                                          object from a
                                                          name, and
                                                          usually does
                                                          not block.
                                                          What is the <br>
                                                          device name?
                                                          you can
                                                          examine <font
                                                          size="-0">ObjectName

                                                          unicode
                                                          string.</font></div>
                                                          <div><font
                                                          size="-0"> </font></div>
                                                          <div>IoGetDeviceObjectPointer()

                                                          does the
                                                          following
                                                          thing:</div>
                                                          <div> </div>
                                                          <div>ZwOpenFile(ObjectName)

                                                          to get a
                                                          handle</div>
                                                          <font
                                                          size="-0">
                                                          <div>ObReferenceObjectByHandle(handle)

                                                          to get the
                                                          FileObject</div>
                                                          <font
                                                          size="-0">
                                                          <div>IoGetRelatedDeviceObject(FileObject)

                                                          to get the
                                                          device object</div>
                                                          <div> </div>
                                                          <div>you can
                                                          further step
                                                          into the
                                                          assembly code
                                                          to nail down
                                                          which function
                                                          call causes
                                                          the lock.</div>
                                                          <div> </div>
                                                          <div>you can
                                                          also list all
                                                          locks using
                                                          these commands
                                                          in windbg:</div>
                                                          <div> </div>
                                                          <div>!locks</div>
                                                          <div>!deadlock</div>
                                                          </font></font>
                                                          <div> <br>
                                                          --- On <b>Tue,

                                                          3/13/12, Ribhi
                                                          Kamal <i>&lt;<a
moz-do-not-send="true"
                                                          href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;</i></b> wrote:<br>
                                                          </div>
                                                          <blockquote
                                                          style="BORDER-LEFT:rgb(16,16,255)
                                                          2px
                                                          solid;PADDING-LEFT:5px;MARGIN-LEFT:5px"><br>
                                                          From: Ribhi
                                                          Kamal &lt;<a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;<br>
                                                          Subject: Re:
                                                          [vbox-dev]
                                                          IoGetDeviceObjectPointer
                                                          hangs
                                                          vboxusbmon<br>
                                                          To: "vbox-dev"
                                                          &lt;<a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=vbox-dev@virtualbox.org"
                                                          rel="nofollow"
target="_blank">vbox-dev@virtualbox.org</a>&gt;<br>
                                                          Date: Tuesday,
                                                          March 13,
                                                          2012, 10:49 AM
                                                          <div>
                                                          <div><br>
                                                          <br>
                                                          <div>Sorry,
                                                          actually the
                                                          IRQL ==
                                                          PASSIVE_LEVEL
                                                          is okay. So
                                                          just ignore
                                                          that bit.<br>
                                                          <br>
                                                          <div>On Tue,
                                                          Mar 13, 2012
                                                          at 1:27 PM,
                                                          Ribhi Kamal <span
                                                          dir="ltr">&lt;<a
moz-do-not-send="true"
                                                          href="http://us.mc1603.mail.yahoo.com/mc/compose?to=rbhkamal@gmail.com"
                                                          rel="nofollow"
target="_blank">rbhkamal@gmail.com</a>&gt;</span> wrote:<br>
                                                          <blockquote
                                                          style="BORDER-LEFT:#ccc
                                                          1px
                                                          solid;MARGIN:0px
                                                          0px 0px
                                                          0.8ex;PADDING-LEFT:1ex">
                                                          <div>
                                                          <div>
                                                          <div>I've been
                                                          troubleshooting

                                                          an issue that
                                                          prevents vbox
                                                          from capturing
                                                          USB devices
                                                          when other
                                                          specific USB
                                                          devices are
                                                          plugged in
                                                          (i.e. Sprint
                                                          USB crap). I
                                                          finally
                                                          managed to
                                                          track down the
                                                          problem to
                                                          IoGetDeviceObjectPointer
                                                          in
                                                          VboxUsbMonHubDevWalk. IoGetDeviceObjectPointer
                                                          was getting
                                                          called,
                                                          however, it
                                                          never
                                                          returned.
                                                          <div><br>
                                                          </div>
                                                          <div>I'm not
                                                          an expert in
                                                          windows driver
                                                          development so
                                                          I'd like to
                                                          run things by
                                                          you before I
                                                          start fixing
                                                          it.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>Firstly,
                                                          I'm not really
                                                          sure why it
                                                          hangs
                                                          (deadlocks?)
                                                          there for some
                                                          devices and
                                                          not others.
                                                          However, I
                                                          believe that
                                                          it may be due
                                                          to the fact
                                                          that some
                                                          driver
                                                          interfaces
                                                          cause blocking
                                                          PnP events.
                                                          Due to that,
                                                          vboxusbmon
                                                          runs into a
                                                          deadlock when
                                                          executing IoGetDeviceObjectPointer

                                                          because it is
                                                          being used
                                                          directly from
                                                          a callback
                                                          function,
                                                          VBoxUsbMonDeviceControl,
                                                          and
                                                          IRQL==PASSIVE_LEVEL.<br>
                                                          <div>
                                                          <div><br>
                                                          </div>
                                                          <div>What led
                                                          me to that
                                                          conclusion is
                                                          that right
                                                          after
                                                          IoGetDeviceObjectPointer
                                                          is executed, I
                                                          start seeing
                                                          lots of PnP
                                                          events.</div>
                                                          <div>
                                                          <div>USBMon::vboxUsbMonHubDevWalk:

                                                            </div>
                                                          <div>IoGetDeviceObjectPointer

                                                          - Starting  
                                                            </div>
                                                          <div><br>
                                                          </div>
                                                          <div>USBMon::VBoxUsbMonPnPHook:

                                                               </div>
                                                          <div>VBoxUsbMonPnPHook

                                                          In    </div>
                                                          <div><br>
                                                          </div>
                                                          <div>USBMon::VBoxUsbMonPnPHook:

                                                               </div>
                                                          <div>==&gt;PnP:

                                                          Mn(IRP_MN_QUERY_DEVICE_RELATIONS),

                                                          PDO(0x8833d028),

IRP(0x882a71a8),
Status(0xc00000bb) </div>
                                                          <div><br>
                                                          </div>
                                                          <div>See
                                                          attached for
                                                          complete debug
                                                          view.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>Are my
                                                          assumptions
                                                          correct? If so
                                                          how would you
                                                          go about
                                                          fixing the
                                                          problem.<br>
                                                          </div>
                                                          </div>
                                                          <div><br>
                                                          </div>
                                                          <div>Thanks!</div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <div><br>
                                                          </div>
                                                          -- <br>
                                                          -- Ribhi<br>
                                                          </div>
                                                          </div>
                                                          </blockquote>
                                                          </div>
                                                          <br>
                                                          <br
                                                          clear="all">
                                                          <div><br>
                                                          </div>
                                                          -- <br>
                                                          -- Ribhi<br>
                                                          </div>
                                                          <br>
                                                          </div>
                                                          </div>
                                                          -----Inline
                                                          Attachment
                                                          Follows-----<br>
                                                          <br>
                                                          <div>_______________________________________________<br>
                                                          vbox-dev
                                                          mailing list<br>
                                                          <a
                                                          moz-do-not-send="true"
href="http://us.mc1603.mail.yahoo.com/mc/compose?to=vbox-dev@virtualbox.org"
                                                          rel="nofollow"
target="_blank">vbox-dev@virtualbox.org</a><br>
                                                          <a
                                                          moz-do-not-send="true"
href="https://www.virtualbox.org/mailman/listinfo/vbox-dev"
                                                          rel="nofollow"
target="_blank">https://www.virtualbox.org/mailman/listinfo/vbox-dev</a><br>
                                                          </div>
                                                          </blockquote>
                                                          </td>
                                                          </tr>
                                                          </tbody>
                                                          </table>
                                                          </blockquote>
                                                          </div>
                                                          <br>
                                                          <br
                                                          clear="all">
                                                          <div><br>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <span><font
                                                          color="#888888">--
                                                          <br>
                                                          -- Ribhi<br>
                                                          </font></span></div>
                                                        <span><font
                                                          color="#888888"><br>
                                                          <br
                                                          clear="all">
                                                          <div><br>
                                                          </div>
                                                          -- <br>
                                                          -- Ribhi<br>
                                                          </font></span></td>
                                                    </tr>
                                                  </tbody>
                                                </table>
                                              </blockquote>
                                              <br>
                                              <br clear="all">
                                              <div><br>
                                              </div>
                                              -- <br>
                                              -- Ribhi<br>
                                            </div>
                                          </div>
                                        </div>
                                      </blockquote>
                                    </td>
                                  </tr>
                                </tbody>
                              </table>
                              <br>
                              <fieldset></fieldset>
                              <br>
                              <pre>_______________________________________________
vbox-dev mailing list
<a moz-do-not-send="true" href="mailto:vbox-dev@virtualbox.org" target="_blank">vbox-dev@virtualbox.org</a>
<a moz-do-not-send="true" href="https://www.virtualbox.org/mailman/listinfo/vbox-dev" target="_blank">https://www.virtualbox.org/mailman/listinfo/vbox-dev</a>
</pre>
                            </div>
                          </blockquote>
                        </td>
                      </tr>
                    </tbody>
                  </table>
                </blockquote>
              </div>
            </div>
          </div>
        </blockquote>
      </div>
      <br>
      <br clear="all">
      <div><br>
      </div>
      -- <br>
      -- Ribhi<br>
    </blockquote>
  </body>
</html>