Re: USB serial regression 2.6.31.1 -> 2.6.31.2 (and 2.6.32-rc3)

[Alan Stern]

On Sat, 10 Oct 2009, Benjamin Herrenschmidt wrote:

> (Adding Rafael)
> 
> On Sat, 2009-10-10 at 11:31 +1100, Benjamin Herrenschmidt wrote:
> > On Sat, 2009-10-10 at 11:25 +1100, Benjamin Herrenschmidt wrote:
> > > Hi folks !
> > > 
> > > My USB GSM modem (Huawei 169, pretty common stuff) stopped working in
> > > the latest ubuntu karmic update. So far, I tracked it down to a
> > > regression that happened in the stable releases between 2.6.31.1 and
> > > 2.6.31.2 (still present in .3). I haven't tested 2.6.32-rc* yet and
> > > haven't had a chance to bisect (need to make myself a trimmed
> > > down .config first).
> > 
> > 2.6.32-rc3 is also busted with a different log output:
> > 
> > Oct 10 11:27:36 pasglop kernel: [   34.480060] usb 4-1: new full speed USB device using uhci_hcd and address 2
> > Oct 10 11:27:36 pasglop kernel: [   34.645057] usb 4-1: configuration #1 chosen from 1 choice
> > Oct 10 11:27:36 pasglop kernel: [   34.658115] Initializing USB Mass Storage driver...
> > Oct 10 11:27:36 pasglop kernel: [   34.660006] scsi2 : SCSI emulation for USB Mass Storage devices
> > Oct 10 11:27:36 pasglop kernel: [   34.660290] usbcore: registered new interface driver usb-storage
> > Oct 10 11:27:36 pasglop kernel: [   34.660294] USB Mass Storage support registered.
> > Oct 10 11:27:36 pasglop kernel: [   34.661566] usb-storage: device found at 2
> > Oct 10 11:27:36 pasglop kernel: [   34.661568] usb-storage: waiting for device to settle before scanning
> > Oct 10 11:27:36 pasglop kernel: [   35.100131] usb 4-1: USB disconnect, address 2
> > Oct 10 11:27:36 pasglop kernel: [   35.345076] usb 4-1: new full speed USB device using uhci_hcd and address 3
> > Oct 10 11:27:41 pasglop kernel: [   35.503633] usb 4-1: configuration #1 chosen from 1 choice
> > Oct 10 11:27:41 pasglop kernel: [   35.515533] scsi6 : SCSI emulation for USB Mass Storage devices
> > Oct 10 11:27:41 pasglop kernel: [   35.516567] usb-storage: device found at 3
> > Oct 10 11:27:41 pasglop kernel: [   35.516569] usb-storage: waiting for device to settle before scanning
> > Oct 10 11:27:41 pasglop kernel: [   40.518055] usb-storage: device scan complete
> > Oct 10 11:27:41 pasglop kernel: [   40.521051] scsi 6:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 2
> > Oct 10 11:27:41 pasglop kernel: [   40.524065] scsi 6:0:0:1: Direct-Access     HUAWEI   SD Storage       2.31 PQ: 0 ANSI: 2
> > Oct 10 11:27:41 pasglop kernel: [   40.546018] sr1: scsi-1 drive
> > Oct 10 11:27:43 pasglop kernel: [   40.547167] sr 6:0:0:0: Attached scsi CD-ROM sr1
> > Oct 10 11:27:43 pasglop kernel: [   40.548872] sr 6:0:0:0: Attached scsi generic sg2 type 5
> > Oct 10 11:27:43 pasglop kernel: [   40.549178] sd 6:0:0:1: Attached scsi generic sg3 type 0
> > Oct 10 11:27:43 pasglop kernel: [   40.681084] usb 4-1: reset full speed USB device using uhci_hcd and address 3
> > Oct 10 11:27:43 pasglop kernel: [   40.960039] usb 4-1: reset full speed USB device using uhci_hcd and address 3
> > Oct 10 11:27:43 pasglop kernel: [   41.233071] usb 4-1: reset full speed USB device using uhci_hcd and address 3
> > Oct 10 11:27:43 pasglop kernel: [   41.509066] usb 4-1: reset full speed USB device using uhci_hcd and address 3
...
> > At the end, I think I yanked it out.

This looks a lot like a hardware problem, such as bad USB cables.  
Could you collect a usbmon trace for bus 4?  It ought to show whether
this is the case or whether software is at fault.

Alan Stern

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