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
failed-filtered.log.gz
Description: GNU Zip compressed data
_______________________________________________ vbox-dev mailing list [email protected] https://www.virtualbox.org/mailman/listinfo/vbox-dev
