linux-kernel - Re: [linux-usb-devel] 2.6.19-rc5-mm1

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Message-ID: <20061110192937.GB9659@ens-lyon.fr>
Date:	Fri, 10 Nov 2006 20:29:37 +0100
From:	Benoit Boissinot <benoit.boissinot@...-lyon.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Mattia Dongili <malattia@...ux.it>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	SCSI development list <linux-scsi@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.19-rc5-mm1

On Thu, Nov 09, 2006 at 02:51:00PM -0800, Andrew Morton wrote:
> On Thu, 9 Nov 2006 16:58:31 -0500 (EST)
> Alan Stern <stern@...land.harvard.edu> wrote:
> > On Thu, 9 Nov 2006, Mattia Dongili wrote:
> > > On Thu, Nov 09, 2006 at 11:04:53AM -0800, Andrew Morton wrote:
> > > [...]
> > > > > [27526.232000] EIP: [<e8074e26>]
> > > > > scsi_device_dev_release_usercontext+0x36/0x100 [scsi_mod] SS:ESP
> > > > > 0068:dfdb1e3c
> > > > > 
> > > > > full dmesg attached, I can test patches and provide any useful
> > > > > information if needed (just not now because the dock is at work).
> > > > 
> > > > You're the second or third person to report this (to no effect, btw). 
> > > 
> > > oh, great. I was going to report the same (had with usb key unplug).
> > > Linux version 2.6.19-rc5-mm1-1 (mattia@...amune) (gcc version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13)) #4 SMP Wed Nov 8 22:46:11 CET 2006
> > 
> > I don't know exactly where the problem lies, but I have narrowed it down.
> > 
> > In drivers/scsi/sd.c:sd_probe(), the call to add_disk() increases the 
> > device's refcount by 1.  However in sd_remove(), the call to del_gendisk() 
> > decreases the device's refcount by 2.  Consequently the structure is 
> > deallocated too early, causing the oops.
> > 
> > Somebody who knows more than I do about add_disk() and del_gendisk() will 
> > have to figure what's going wrong.
> > 
> 
> hm.  Maybe it's the disk_sysfs_symlinks() changes.
> 
> Could someone who can reproduce this please try this revert, on
> 2.6.19-rc2-mm2 through 2.6.19-rc5-mm1?
> 

I confirm it fixes it for me too.

regards,

Benoit

-- 
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