Date: Mon, 29 Sep 2008 01:46:15 +0100 From: Bruce M Simpson <bms@incunabulum.net> To: FreeBSD stable <freebsd-stable@freebsd.org> Subject: USB detach/attach hangs with 7.0-RELEASE and 7.1-PRERELEASE Message-ID: <48E02557.2020303@incunabulum.net>
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Hi, I've noticed some general instability with plugging in or removing USB devices with FreeBSD 7.x, even when the devices are not actively in use. I had this happen with umass and ucom devices 3 times today. The machine hangs solid, there are no obvious signs of a panic or trap to DDB. I can't provide backtraces unfortunately -- these hangs happen on both my laptop and desktop, and I usually have X running -- if I had more specific information, I'd open a PR. Again, there seems to be no reason why this should happen, the devices are off-the-shelf consumer items known to work with existing drivers, and have been repeatedly used in other OSes without these hangs happening; consider this an "anecdotal report". [For some reason my IBM laptop will often not allow me to break into DDB on a driver related panic, and will just immediately reboot -- I lack free time to track down exactly why this could be. My desktop has a USB keyboard and this appears not to be supported by DDB, I ordered a PS/2 keyboard which hasn't arrived, but that's another story.] thanks BMS
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