I have a PCIe USB card which is exported to the bhyve vm using
passthrough. I have tried to use the card in Ubuntu, Debian 8 and Centos
7. Each time the OS has given a segmentation fault on bootup and killed
the bhyve session. This is what i get in the bhyve-log:

Is stderr logged anywhere ? That may have additional error output from the bhyve passthru code.

The USB card works fine on the host and is detected by the xhci driver.
The card is "Inateck Superspeed 4 Ports PCI-E to USB 3.0 Expansion Card
- Interface USB 3.0 4-Port" (https://www.amazon.com/gp/product/B00B6ZCNGM)

ppt3@pci0:129:0:0:      class=0x0c0330 card=0x11001b73 chip=0x11001b73
rev=0x10 hdr=0x00
     vendor     = 'Fresco Logic'
     device     = 'FL1100 USB 3.0 Host Controller'
     class      = serial bus
     subclass   = USB

 Would you be able to post the output of

    pciconf -l -BbcV pci0:129:0:0


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