linux-kernel - Re: [REGRESSION] 2.6.24/25: random lockups when accessing external USB harddrive

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Date:	Thu, 26 Jun 2008 09:31:48 +0300
From:	Stefan Becker <Stefan.Becker@...ia.com>
To:	ext Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [REGRESSION] 2.6.24/25: random lockups when accessing external
 USB harddrive

Hi,

ext Alan Stern wrote:
> On Wed, 25 Jun 2008, Stefan Becker wrote:
> 
>> HCD URB list locked by usb_hcd_link_urb_to_ep!
>>
>> As far as I understand the matter this only can happen if 
>> usb_hcd_link_urb_to_ep() gets interrupted while holding the spinlock. 
>> But according to the contract at the header of the function it should be 
>> called with interrupts disabled!
> 
> So it should.  Do you know how to test whether interrupts are enabled?  
> There's a routine called raw_irqs_disabled() defined in 
> include/asm/irqflags.h.  Stick it inside usb_hcd_link_urb_to_ep, and 
> the first time it returns nonzero, do a dump_stack().

Tried both and got nothing. So either our reasoning is wrong or 
something really weird is going on. I'll try to improve my debugging 
code and use dump_stack() at the place where it locks up.

Regards,

	Stefan

---
Stefan Becker
E-Mail: Stefan.Becker@...ia.com
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