Re: [Bugme-new] [Bug 13772] New: khubd bug: unable to handle kernel NULL pointer dereference

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On Tue, Jul 14, 2009 at 05:52:11PM -0400, Alan Stern wrote:
> On Tue, 14 Jul 2009, Andrew Morton wrote:
> 
> > > http://bugzilla.kernel.org/show_bug.cgi?id=13772
> > > 
> > >            Summary: khubd bug: unable to handle kernel NULL pointer
> > >                     dereference
> 
> > > This issue occurs occasionally just removing usb drives, but can be stimulated
> > > to occur in about 30 seconds by alternatively plugging and unplugging two usb
> > > flash drives repeatedly (plug/unplug one drive every 2-5 seconds). Once this
> > > error occurs, no other USB connection events are reported in dmesg or via hal.
> > > 
> > > usb 4-1: USB disconnect, address 33
> > > BUG: unable to handle kernel NULL pointer dereference at 00000008
> > > IP: [<c02562c4>] device_del+0x8/0x124                                           
> 
> > > Pid: 706, comm: khubd Not tainted (2.6.30-strike #1) CF-18KJHZXBM
> > > EIP: 0060:[<c02562c4>] EFLAGS: 00010286 CPU: 0
> > > EIP is at device_del+0x8/0x124
> > > EAX: 00000008 EBX: 00000008 ECX: f1c558ac EDX: f854cee7
> > > ESI: f1c558ac EDI: 00000008 EBP: f73dbdc8 ESP: f73dbdbc
> > >  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> > > Process khubd (pid: 706, ti=f73da000 task=f6863140 task.ti=f73da000)
> > > Stack:
> > >  00000000 f1c558ac 00000008 f73dbddc f854cefc f1c558ac f8552d70 f842db9c
> > >  f73dbdec f8415fa6 f1c558ac f8552d70 f73dbdfc c0257f84 f1c558ac f1c558e0
> > >  f73dbe0c c0258036 00000000 f1c558ac f73dbe20 c02577b2 f1c558ac f1c558b4
> > > Call Trace:
> > >  [<f854cefc>] ? sd_remove+0x15/0x50 [sd_mod]
> > >  [<f8415fa6>] ? scsi_bus_remove+0x29/0x2f [scsi_mod]
> > >  [<c0257f84>] ? __device_release_driver+0x58/0x75
> > >  [<c0258036>] ? device_release_driver+0x18/0x23
> 
> I believe this is a known problem in the SCSI disk driver.  (NOT a bug
> in khubd, despite what the title says.)  That bug has been fixed in
> 2.6.31-rc1; I have no idea why the fix hasn't been submitted for the
> 2.6.30.stable series.
> 
> If I'm right, the fix is available here:
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=601e7638254c118fca135af9b1a9f35061420f62

James, any reason to not apply this to the .30 stable tree?

thanks,

greg k-h
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