RE: USB-related instability on 2.6.23-rc1

Greg KH wrote:
On Tue, Jul 31, 2007 at 03:06:07PM -0600, Grant Likely wrote:
I've observed instability on my Macbook c2d with the Linus' latest
tree. Symptom is that USB devices start behaving badly and the
kernel seems to be registering incorrect HID events; (ie. moving the
mouse causes odd keyboard events). If I continue to attempt to use
the
mouse, it results in a system freeze (and I don't see any kind of
backtrace in /var/log/kern.log). To reproduce the problem, I just
need to be using the keyboard/mouse. If I leave the system idle, the
problem does not seem to occur. If I actively use the
keyboard/mouse, the problem can occur at any time; usually within
5-10 minutes.

In my particular case, I've got both a USB key/mouse pair on the
laptop and an external key/mouse pair plugged in via a hub.
Typically, it's the external mouse that exhibits badness first.

USB HID devices are definitely affected. I have not tested USB block
devices. Isochronous transfers to a USB headset appear to be
unaffected, but that's under minimal testing.

I've bisected down to commit
196705c9bbc03540429b0f7cf9ee35c2f928a534, "USB: EHCI cpufreq fix"

Reverting the patch at the head of the tree makes the kernel stable
again.

I've attached my kernel config file and a dmesg output

Can you enable CONFIG_USB_DEBUG and send the linux-usb-devel list and
us, the output when you have these problems?

thanks,

greg k-h

I'm actually in the process right now of attaching a patch for this
problem (well, I hope it's a patch for the problem you're seeing) right
now on the bugzilla (bug 8535 at bugzilla.kernel.org). If you'd like to
test it, that would be great.

Thanks,
Stuart
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