Re: serious 2.6 bug in USB subsystem?

[Wouter Lueks]

On Mon, Oct 27, 2003 at 02:35:09PM -0800, David Mosberger wrote:
> One-line summary: plug-in your USB keyboard, see your machine die.
>
> So, I have this non-name USB keyboard (with built-in 2-port USB hub)
> which reliably crashes 2.6.0-test{8,9} on both x86 and ia64.  In
> retrospect, it's clear to me that the same keyboard also occasionally
> crashes 2.4 kernels, but there the problem appears more seldom.
> Perhaps once in 10 reboots and once the machine is booted and the
> keyboard is running, it keeps on working.  The keyboard in question is
> a BTC 5141H.

I am having the same problem as David but with a major difference, the
keyboard doesn't have any problems on either 2.4.21 or windows XP, it
works flawlessly there. I have tested up to 2.6.2 and haven't seen
anything in the changelogs that suggests its fixed in 2.6.3

> In any case, even if the keyboard happened to be completely broken, I
> don't think it should be possible to crash the kernel merely by
> connecting a (potentially) bad USB device, so, regardless, there seems
> to be something off in the 2.6 USB subsystem.
> 
> Here is a more detailed description of how to reproduce the problem
> and the behavior that I'm seeing with 2.6 (I don't think the exact
> kernel version matters much; it definitely happens both with
> 2.6.0-test8 and 2.6.0-test9):
> 
>  1) disconnect the 5141H keyboard
>  2) power on the machine
>  3) boot into Linux 2.6
>  4) connect the keyboard
>  5) see the normal "USB HID" keyboard connection message
>  6) wait a few seconds
>  7) machine is dead

I used the exact same steps and the result is the same, the machine is
dead, and I can do a hard reset.
>
> On x86, I see this message prior to the death of the machine:
>
>  drivers/usb/input/hid-core.c: ctrl urb status -104 received
>  drivers/usb/input/hid-core.c: timeout initializing reports

See the attached dmesg file I get one error more. On top of that I have
enabled usb debugging so perhaps the dmesg file yields more result when
someone who knows this subsystem can see what is happening here.
Personally I lack the experience to fix this problem. When you need any
more information I'll be happy to provide it.

One thing to note though is that I do have usb legacy mode turned on,
because I otherwise cannot boot into linux.

Wouter
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