linux-kernel - Re: 2.6.18-rc6-mm2

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Message-ID: <6bffcb0e0609151335wce499b0nb3e39bdc26b4b433@mail.gmail.com>
Date:	Fri, 15 Sep 2006 22:35:37 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Greg KH" <gregkh@...e.de>
Cc:	"Andrew Morton" <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: 2.6.18-rc6-mm2

On 15/09/06, Greg KH <gregkh@...e.de> wrote:
> On Fri, Sep 15, 2006 at 12:17:33AM +0200, Michal Piotrowski wrote:
> > On 14/09/06, Greg KH <gregkh@...e.de> wrote:
> > >On Thu, Sep 14, 2006 at 01:11:49PM +0200, Michal Piotrowski wrote:
> > >> On 12/09/06, Andrew Morton <akpm@...l.org> wrote:
> > >> >
> > >>
> > >>ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm2/
> > >> >
> > >>
> > >> Kernel 2.6.18-rc6-mm2 - xfs-rename-uio_read.patch
> > >> Built with gcc 3.4
> > >> Reading specs from
> > >/usr/local/bin/../lib/gcc/i686-pc-linux-gnu/3.4.6/specs
> > >> Configured with: ./configure --prefix=/usr/local/ --disable-nls
> > >> --enable-shared --enable-languages=c --program-suffix=-3.4
> > >> Thread model: posix
> > >> gcc version 3.4.6
> > >>
> > >> ACPI: PCI Interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 17
> > >> BUG: unable to handle kernel paging request at virtual address 5a5a5aaa
> > >> usb usb2: configuration #1 chosen from 1 choice
> > >> hub 2-0:1.0: USB hub found
> > >> printing eip:
> > >> c01f596a
> > >> *pde = 00000000
> > >> Oops: 0000 [#1]
> > >> 4K_STACKS PREEMPT SMP
> > >> last sysfs file:
> > >> Modules linked in:
> > >> CPU:    0
> > >> EIP:    0060:[<c01f596a>]    Not tainted VLI
> > >> EFLAGS: 00010202   (2.6.18-rc6-mm2 #122)
> > >> EIP is at kref_get+0x7/0x55
> > >> eax: 5a5a5aaa   ebx: 5a5a5aaa   ecx: c75cfe54   edx: c75cfe54
> > >> esi: c033152f   edi: c75cfe5e   ebp: c755be20   esp: c755be18
> > >> ds: 007b   es: 007b   ss: 0068
> > >> Process usb-probe-<NULL (pid: 291, ti=c755b000 task=c759aab0
> > >> task.ti=c755b000)
> > >
> > >You have the USB multi-threaded device probing config option
> > >(CONFIG_USB_MULTITHREAD_PROBE) enabled, right?
> >
> > Yes, I have.
> >
> > >
> > >Does disabling it fix this problem?
> >
> > I'll disable it and try to reproduce the problem.
>
> Great, please let us know.

Good news, I can't reproduce this bug with CONFIG_USB_MULTITHREAD_PROBE=n.

BTW. This might be a problem with CONFIG_PCI_MULTITHREAD_PROBE=y
http://www.stardust.webpages.pl/files/mm/2.6.18-rc6-mm2/bug.jpg

>  Your device list looks simple, I don't see
> why this would happen (no confusing devices).  In fact, this is getting
> triggered by the root hub, which Alan's update specifically addresses by
> not making that be multithreaded, as it's not needed.
>
> I'll work on intergrating that patch update.
>
> thanks,
>
> greg k-h
>

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/)
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