From owner-freebsd-hackers@FreeBSD.ORG  Thu Feb 26 10:26:48 2004
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Date: Thu, 26 Feb 2004 10:26:45 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Eugene Grosbein <eugen@kuzbass.ru>
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Subject: Re: Testers needed: Joe's MFC of USB code
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On Fri, 27 Feb 2004, Eugene Grosbein wrote:
[...]
>    'Failed to set value of option mode: Device busy'.
> 6. Choose 'File/Exit' menu in this xscanimage window.
> 
> Several seconds later system will lock up. There is nothing to be done
> if you are in X, only power down/up cycle will help.
> 
> 
> Sympthoms of lockup: system does not respond to pings, consoles do not switch.
> Ctril-Alt-ESC will work for a few moments after lockup
> but if you wait a little, it won't work and lockup will become 'total'.
> 
> Versions: sane-backends-1.0.13_2, sane-frontends-1.0.11_1, gimp-1.2.3_2,1
> 
> Now what do we have with a patch proposed? Well, instead of lockup
> we obtain good old kernel panic (the patch is really usefull).
> And crashdump, of course. The panic is 100% repeatable. Here comes gdb
> backtrace (kernel compiled with INVARIANTS and debug info):
> 
thankyou!

this is exactly the kind of thing we are looking for..

I have a scanner here.. I'll try duplicate it..
looks like it is caused by closing the file descriptor while the device
is "busy" in some way..

Julian