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From: Yuri <yuri@rawbw.com>
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Subject: VirtualBox-4.2.4: guest crashes when USB device is shared with it:
 Assertion "Expression: PDMCritSectIsOwner"
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I have amd64 host with Ubuntu 64bit guest. It is very stable without USB 
sharing. But once I do, machine crashes after 5-30 minutes.
See the log below.
During crashes shared USB device was likely active.

Yuri


--- end of guest log ---
00:00:35.198316 Guest Additions capability report: (0x5) seamless: yes, 
hostWindowMapping: no, graphics: yes
00:00:35.199866 Initializing X11 clipboard backend
00:00:35.412590 Shared clipboard: starting shared clipboard thread
01:08:25.861539 VUSB: attached '000000081b407700[proxy 04e8:6860]' to port 2
01:20:06.101018
01:20:06.101020 !!Assertion Failed!!
01:20:06.101021 Expression: 
PDMCritSectIsOwner(pOhci->pDevInsR3->pCritSectRoR3)
01:20:06.101023 Location  : 
/usr/home/yuri/vbox/emulators/virtualbox-ose/work/VirtualBox-4.2.4/src/VBox/Devices/USB/DevOHCI.cpp(2505) 
bool ohciRhXferError(VUSBIROOTHUBPORT*, VUSBURB*)