The following reply was made to PR amd64/156725; it has been noted by GNATS.
From: Arnaud Lacombe <[email protected]> To: [email protected], [email protected] Cc: Subject: Re: amd64/156725: USB stack stall cause complete system input loss Date: Fri, 29 Apr 2011 16:48:52 -0400 this bug is tightly related to amd64/156726. Considering the following scenario: 1) plug a snd_uaudio(4)-based device 2) open aumix(1) on, pcmN, the mixer device attached to the previously attached device 3) unplug the snd_uaudio(4)-based device [the USB stack busy wait pcmN detach] 4) close aumix(1) [pcmN finally detach] If there is no USB activity (ie, no attach/detach, but "normal" hid activity), the USB stack recovers. If another USB device is attached/detached while the stack busy wait on pcmN detachment (between step 3 and step 4), events ends up being queued. Once step 4 is done, events gets processed, however, once completed the USB stall, ie. no more mouse or keyboard. At this point, I do not see any USB related message while the system halts. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-amd64 To unsubscribe, send any mail to "[email protected]"
