Sorry, actually the IRQL == PASSIVE_LEVEL is okay. So just ignore that bit.
On Tue, Mar 13, 2012 at 1:27 PM, Ribhi Kamal <[email protected]> wrote: > 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. > > I'm not an expert in windows driver development so I'd like to run things > by you before I start fixing it. > > 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. > > What led me to that conclusion is that right after > IoGetDeviceObjectPointer is executed, I start seeing lots of PnP events. > USBMon::vboxUsbMonHubDevWalk: > IoGetDeviceObjectPointer - Starting > > USBMon::VBoxUsbMonPnPHook: > VBoxUsbMonPnPHook In > > USBMon::VBoxUsbMonPnPHook: > ==>PnP: Mn(IRP_MN_QUERY_DEVICE_RELATIONS), PDO(0x8833d028), > IRP(0x882a71a8), Status(0xc00000bb) > > See attached for complete debug view. > > Are my assumptions correct? If so how would you go about fixing the > problem. > > Thanks! > > -- > -- Ribhi > -- -- Ribhi
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