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POhow to kextunload AppleUSBCompostie on MacOSX for VirtualBox guest OS USB device working properly?
 

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  1. POhow to kextunload AppleUSBCompostie on MacOSX for VirtualBox guest OS USB device working properly?
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    <p>I had installed VirtualBox in Lion OSX, and found an USB device was not working properly in Window 7 guest OS. when I selected the USB device from VirtualBox devices menu to assign the USB device to guest OS, the VirtualBox report an error:</p> <pre><code>Failed to create a proxy device for the usb device Error: VERR_OUT_OF_RESOURCES </code></pre> <p>I analyzed the output from kextstat and system.log,comparing the different between before and after the USB device insertion.</p> <pre><code>Oct 15 19:45:02 yee kernel[0]: 0 0 AppleUSBCDC: start - initDevice failed Oct 15 19:45:02 yee kernel[0]: USBF: 26094.693 IOUSBCompositeDriver[0xffffff800bf6fb00](IOUSBDevice) GetFullConfigDescriptor(0) returned NULL </code></pre> <p>then I found there were two drivers loaded by Mac kernel</p> <p>1) com.apple.driver.AppleUSBCDC</p> <p>2) com.apple.driver.AppleUSBComposite</p> <p>I can unload 1) using command "sudo kextunload -b", but can not unload 2). when I kextunload AppleUSBComposite</p> <pre><code>Kext user-space log filter changed from 0xff2 to 0xfff. Kext kernel-space log filter changed from 0xff2 to 0xfff. Requesting unload of com.apple.driver.AppleUSBComposite (with termnation of IOServices). (kernel) User-space log flags changed from 0x0 to 0xfff. (kernel) Received 'Unload' request from user space. (kernel) Can't remove kext com.apple.driver.AppleUSBComposite; services failed to terminate - 0xdc008018. Kernel error handling kext request - (libkern/kext) kext is in use or retained (cannot unload). Failed to unload com.apple.driver.AppleUSBComposite - (libkern/kext) kext is in use or retained (cannot unload). </code></pre> <p><strong>how can I unload it for my guest OS USB device working properly!</strong> </p>
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