linux-kernel - Re: [BUG] USB input death then system freeze

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Date:	Fri, 25 May 2007 11:50:16 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Nicolas Mailhot <nicolas.mailhot@...oste.net>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-usb-devel@...ts.sourceforge.net, Zan Lynx <zlynx@....org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [BUG] USB input death then system freeze

On Thu, 24 May 2007, Nicolas Mailhot wrote:

> Most recent kernel where this bug did *NOT* occur: pre 2.6.21 mm
> kernels, non-mm 2.6.22-rc2
> Distribution: Fedora Devel
> Hardware Environment: EHCI input on external powered hub with CK804 mainboard
> Software Environment: Nothing specific
> Problem Description:
> After a few hours of activity 2.6.22-rc1-mm1 and 2.6.22-rc2-mm1 will lose USB
> HID INPUT (keyboard or mice with no priority), then the system will freeze
> drivers/hid/usbhid/hid-core.c: input irq status -75 received

This is now handled in bugzilla [1]. Zan Lynx also reported this problem, 
and from the HID_DEBUG output he provided is evident that it is caused by 
HID layer receiving a report of size 4294967284 (which corresponds to 
urb->actual_length of the URB received from USB core).

Alan Stern suggested to reproduce the bug with CONFIG_USB_DEBUG and also 
collect the usbmon trace, so that we can clearly understand what happens.

I am now inclined to think that this is caused by USB core messing up the 
URB somehow, HID core seems to receive the URB with already bogus values.

[1] http://bugzilla.kernel.org/show_bug.cgi?id=8535

Thanks,

-- 
Jiri Kosina
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