I get this error too.

Alfred Morgan wrote:
> I am on OpenBSD 6.4 amd64 also getting this error message. It seems to be
> caused by my USB serial device. If I plug it into a Windows machine then
> Windows reports that the device is malfunctioning. If I plug into OpenBSD
> 6.4 then I get the usbd_free_xfer not free error and my USB ports stop
> working and then I have to reboot. If a dev is interested in my
> malfunctioning USB serial cable in order to reproduce and fix the issue
> then I will be happy to mail it to you. I will send my dmesg on request.
> 
> Leo wrote on 2018-10-13 16:52:36:
> > Hello,
> > i just upgraded to the latest snapshot and i noticed that all my
> > external USB drives are not working anymore. (i tryed 3 different
> > external drives) As soon as i plug them into an USB port I get the
> > following message in my dmesg:
> >
> > > usbd_free_xfer: xfer=0xffffff041e9651e0 not free
> 
> -- 
> -alfred

-- 
WBR, Mikhaylov Aleksandr

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