id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 7462,USB device not available in a guest using more than 1 CPU,Ludovic,,"If I configure my guest OS to use more than 1 CPU then I can't use my USB device. I have a iMac model iMac11,1 with a Intel Core i7 (4 CPU with 2 threads each) The USB device is a CCID smart card reader with vID=0x08E6 and pID=0x3437. The device works great if the guest uses only 1 CPU. But I get errors if I configure VirtualBox to use 2 or more CPU for the guest. The errors reported by the kernel are: {{{ [ 56.092448] usb 2-1: new full speed USB device using ohci_hcd and address 2 [ 62.637182] atkbd.c: Spurious NAK on isa0060/serio0. Some program might be trying access hardware directly. [ 71.249524] usb 2-1: device descriptor read/64, error -110 [ 86.512425] usb 2-1: device descriptor read/64, error -110 [ 86.809503] usb 2-1: new full speed USB device using ohci_hcd and address 3 [ 101.976574] usb 2-1: device descriptor read/64, error -110 [ 117.240584] usb 2-1: device descriptor read/64, error -110 [ 117.536353] usb 2-1: new full speed USB device using ohci_hcd and address 4 [ 122.578952] usb 2-1: device descriptor read/8, error -110 [ 127.698748] usb 2-1: device descriptor read/8, error -110 [ 127.996433] usb 2-1: new full speed USB device using ohci_hcd and address 5 [ 133.042903] usb 2-1: device descriptor read/8, error -110 [ 138.161658] usb 2-1: device descriptor read/8, error -110 [ 138.264556] hub 2-0:1.0: unable to enumerate USB device on port 1 }}} and the lsusb command line tools is locked until the kernel gives up enumerating the device. I have the problem with Debian testing/squeeze and also with Ubuntu 10.04. It is quiet easy to reproduce. I also tried with Windows 7 and the device is visible with 1 CPU but not with a 2 CPU guest. So the problem is not limited to a Linux guest or the Linux kernel. Since the problem is not linked to the guest OS it must be in VirtualBox itself.",defect,closed,USB,VirtualBox 4.0.8,fixed,,,Linux,Mac OS X