linux-kernel - Re: Oops in make_class_name in 2.6.22.1 on Fedora

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Date:	Tue, 11 Sep 2007 11:11:07 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	Pete Zaitcev <zaitcev@...hat.com>,
	<linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: Oops in make_class_name in 2.6.22.1 on Fedora

On Mon, 10 Sep 2007, Greg KH wrote:

> On Mon, Sep 10, 2007 at 08:26:47PM -0700, Pete Zaitcev wrote:
> > Hi, Greg (and others):
> > 
> > I do not seem to be able to find an answer, sorry.
> > Do you happen to remember if this was fixed after 2.6.22.1:
> > 
> > localhost kernel: EIP is at make_class_name+0x27/0x7a
> > localhost kernel:  [<c05586f1>] class_device_del+0x97/0x119
> > localhost kernel:  [<c055877b>] class_device_unregister+0x8/0x10
> > localhost kernel:  [<e08735f4>] __scsi_remove_device+0x1d/0x60 [scsi_mod]
> > localhost kernel:  [<e08711ae>] scsi_forget_host+0x2d/0x4a [scsi_mod]
> > localhost kernel:  [<e086c49c>] scsi_remove_host+0x65/0xd5 [scsi_mod]
> > localhost kernel:  [<e0e76775>] storage_disconnect+0xe/0x16 [usb_storage]
> > localhost kernel:  [<c056f8b8>] usb_unbind_interface+0x44/0x85
> > localhost kernel:  [<c0557df7>] __device_release_driver+0x6e/0x8b
> > 
> > Obviously a known bug but all I see is users reporting it. In my case
> > it's this:
> >  https://bugzilla.redhat.com/show_bug.cgi?id=253424
> > I saw Alan giving it a try here:
> >  http://lkml.org/lkml/2007/7/12/259
> 
> I think this was a scsi problem that has been fixed, but don't really
> remember the exact commit.

Yes.  There are some bugs in the SCSI async-scanning code, and there is
a patch to fix them:

http://git.kernel.org/?p=linux/kernel/git/jejb/scsi-misc-2.6.git;a=commit;h=a93a091df8232fad60867d41fbc3be855a0b78f2

It is scheduled for 2.6.24.  For now, people can work around the bug by 
disabling CONFIG_SCSI_SCAN_ASYNC.

> Alan, any ideas?
> 
> It would probably be good to get this into the next -stable if we can
> figure out which patch did fix it.

I have urged both James Bottomley and Andrew Morton to apply that patch 
as soon as possible.  Neither of them paid any attention.

Alan Stern

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