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From: Stefan Becker <Stefan.Becker@nokia.com>
To: ext Alan Stern <stern@rowland.harvard.edu>,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [REGRESSION] 2.6.24/25: random lockups when accessing external USB harddrive
Date: Thu, 26 Jun 2008 09:31:48 +0300	[thread overview]
Message-ID: <486337D4.1000904@nokia.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0806251408300.3394-100000@iolanthe.rowland.org>

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@nokia.com

  reply	other threads:[~2008-06-26  6:38 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-22 16:55 [REGRESSION] 2.6.24/25: random lockups when accessing external USB harddrive Stefan Becker
2008-06-22 17:42 ` Rene Herman
2008-06-22 19:31   ` Alan Stern
2008-06-23 15:52     ` Stefan Becker
2008-06-23 18:10       ` Alan Stern
2008-06-24 18:41         ` Stefan Becker
2008-06-24 21:15           ` Alan Stern
2008-06-25 15:52             ` Stefan Becker
2008-06-25 18:38               ` Alan Stern
2008-06-26  6:31                 ` Stefan Becker [this message]
2008-06-26 14:25                   ` Alan Stern
2008-06-26 22:07                     ` Stefan Becker
2008-06-27 16:07                       ` David Brownell
2008-06-28 14:31                         ` Stefan Becker
2008-06-27 16:10                       ` Alan Stern
2008-06-28 14:36                         ` Stefan Becker
2008-06-28 15:39                         ` Stefan Becker
2008-06-28 16:53                           ` Alan Stern
2008-06-28 19:34                             ` BUG in 2.6.26-rc8 interrupt handling Becker Stefan (Nokia-D/Salo)
2008-06-28 19:51                               ` David Brownell
2008-06-29 14:57                                 ` PATCH: 2.6.26-rc8: Fix IRQF_DISABLED for shared interrupts Stefan Becker
2008-06-30  3:09                                   ` David Brownell
2008-06-30  5:22                                     ` Stefan Becker
2008-06-30 14:28                                       ` Henrique de Moraes Holschuh
2008-06-30 14:26                                         ` Alan Cox
2008-06-30  9:34                                     ` Stefan Becker
2008-06-30 11:15                                       ` David Brownell
2008-06-30 14:37                                         ` Alan Stern
2008-06-30 18:53                                           ` [PATCH] USB: fix interrupt disabling for HCDs with shared interrupt handlers Stefan Becker
2008-06-30 19:35                                             ` Alan Stern
2008-06-30 20:31                                               ` David Brownell
2008-06-30 21:26                                                 ` Stefan Becker
2008-07-01 14:11                                                   ` Alan Stern
2008-07-01 14:19                                                     ` Leonardo Chiquitto
2008-07-01 16:19                                                     ` Stefan Becker
2008-07-01 18:25                                                       ` Greg KH
2008-07-01 18:59                                                         ` Alan Stern
2008-07-01 19:13                                                           ` Greg KH
2008-07-01 19:21                                                           ` David Brownell
2008-07-01 19:15                                                         ` Stefan Becker
2008-07-01 19:51                                                           ` Greg KH
2008-07-01 16:22                                                     ` David Brownell
2008-06-30 21:29                                                 ` Alan Stern
2008-06-30 21:48                                                   ` David Brownell
2008-06-30 19:57                                         ` PATCH: 2.6.26-rc8: Fix IRQF_DISABLED for shared interrupts David Brownell

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