I get the same thing while trying to write a driver for a USB webcam.
The webcam works fine until this happens.  Rebooting doesn't fix the
problem.
Justin

On Sun, Jan 18, 2004 at 08:34:35PM +0000, Natalia Portillo wrote:
> Dear Kernel Developers.
> 
> This is the bug I'm getting with kernels 2.4.20-xfs-r3, 2.4.23-aa1 and 
> 2.6.0-test5 (hardware information at bottom).
> 
> It seems to be a problem of IRQ conflict.
> USB works perfectly, but, suddenly, it stops working and dmesg starts 
> saying (and doesn't stop until reboot) the following:
> "drivers/usb/host/uhci-hcd.c: cc00: host controller halted. very bad"
> 
> It happens after a random working time. I observed this time is less if 
> I remove the nVidia graphics card and substitute it for an 3Dfx one 
> (the second one doesn't use an IRQ).
> It also seems to happen faster in 2.4 kernels.
> 
> Regards,
> Natalia Portillo
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