freebsd stable - Sep 2008 - USB detach/attach hangs with 7.0-RELEASE and 7.1-PRERELEASE

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

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.

On Mon, 29 Sep 2008 02:46:15 +0200, Bruce M Simpson <bms@incunabulum.net>
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
On my computer I had to disable USB support in the BIOS because it  
'conflicted' with USB support of FreeBSD.
FreeBSD still detects USB and all connected devices.
Maybe this helps on your computer also.

Ronald.

USB support in the BIOS? What kind of support does the BIOS provide that you can
disable?
I'm only able to disable the USB device, but that'd turn it off
completely :(

Henrik.

On Mon, Sep 29, 2008 at 10:05:02PM +0200, Ronald Klop
wrote:
> On Mon, 29 Sep 2008 02:46:15 +0200, Bruce M Simpson
<bms@incunabulum.net>
> 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
> 
> On my computer I had to disable USB support in the BIOS because it  
> 'conflicted' with USB support of FreeBSD.
> FreeBSD still detects USB and all connected devices.
> Maybe this helps on your computer also.
> 
> Ronald.
> 
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