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Date:      Mon, 29 Sep 2008 20:13:39 +0200
From:      Henrik Friedrichsen <henrik@50hz.ws>
To:        FreeBSD stable <freebsd-stable@freebsd.org>
Subject:   Re: USB detach/attach hangs with 7.0-RELEASE and 7.1-PRERELEASE
Message-ID:  <20080929181339.GA12554@dsp.50hz.ws>
In-Reply-To: <48E02557.2020303@incunabulum.net>
References:  <48E02557.2020303@incunabulum.net>

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On Mon, Sep 29, 2008 at 01:46:15AM +0100, Bruce M Simpson wrote:
> 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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Hey,

I can confirm those problems, however I can't provide dumps either. I remember the kernel
panicing with PAGE_FAULT errors though. Good to know, that I'm not the only one with those problems though.

Henrik.



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