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Date: Tue, 30 Oct 2007 12:50:49 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
X-X-Sender: stern@iolanthe.rowland.org
To: Chuck Ebbert <cebbert@redhat.com>
cc: Greg KH <greg@kroah.com>, Pete Zaitcev <zaitcev@redhat.com>,
       <linux-usb-devel@lists.sourceforge.net>, <linux-kernel@vger.kernel.org>,
       Matthew Wilcox <matthew@wil.cx>
Subject: Re: Oops in make_class_name in 2.6.22.1 on Fedora
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On Mon, 22 Oct 2007, Chuck Ebbert wrote:

> On 09/11/2007 11:11 AM, Alan Stern wrote:
> >>>
> >>> 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.
> > 
> 
> The bug still happens with that patch applied and CONFIG_SCSI_SCAN_ASYNC
> enabled. In the marked line, class_dev->class->name is NULL and this causes
> the oops in make_class_name().

Can anybody provide a dmesg log showing the error on a system with 
CONFIG_USB_DEBUG and CONFIG_USB_STORAGE_DEBUG enabled?

Does it still occur with 2.6.24-rc1?

Alan Stern

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