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Date:	Sat, 10 Oct 2009 11:31:24 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Hugh Blemings <hugh@...mings.org>
Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 (and 2.6.32-rc3)

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
Oct 10 11:27:44 pasglop kernel: [   41.784064] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:44 pasglop kernel: [   42.057066] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:44 pasglop kernel: [   42.329066] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:44 pasglop kernel: [   42.613070] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:44 pasglop kernel: [   42.888112] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:44 pasglop kernel: [   43.160070] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   43.433054] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   43.705212] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   43.981068] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   44.257074] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   44.536063] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:46 pasglop kernel: [   44.813088] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:48 pasglop kernel: [   45.085065] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:48 pasglop kernel: [   45.357085] usb 4-1: reset full speed USB device using uhci_hcd and address 3
   .../... (more of these)
Oct 10 11:27:51 pasglop kernel: [   48.779909] sd 6:0:0:1: [sdb] Attached SCSI removable disk
Oct 10 11:27:51 pasglop kernel: [   48.904062] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:51 pasglop kernel: [   49.174068] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:51 pasglop kernel: [   49.445548] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   49.717290] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   49.985098] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   50.268061] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   50.544107] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   50.817073] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   51.088083] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:52 pasglop kernel: [   51.356079] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   51.625086] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   51.893071] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   52.161084] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   52.429060] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   52.701104] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:27:54 pasglop kernel: [   52.969058] usb 4-1: reset full speed USB device using uhci_hcd and address 3
   .../... (more of these)
Oct 10 11:28:21 pasglop kernel: [   79.889107] usb 4-1: reset full speed USB device using uhci_hcd and address 3
Oct 10 11:28:21 pasglop kernel: [   79.945827] usb 4-1: USB disconnect, address 3
Oct 10 11:28:21 pasglop kernel: [   79.950827] sr 6:0:0:0: [sr1] Unhandled error code
Oct 10 11:28:21 pasglop kernel: [   79.950836] sr 6:0:0:0: [sr1] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Oct 10 11:28:21 pasglop kernel: [   79.950846] sr 6:0:0:0: [sr1] CDB: Read(10): 28 00 00 00 00 c6 00 00 20 00
Oct 10 11:28:21 pasglop kernel: [   79.950872] end_request: I/O error, dev sr1, sector 792
Oct 10 11:28:21 pasglop kernel: [   79.950883] Buffer I/O error on device sr1, logical block 792
Oct 10 11:28:21 pasglop kernel: [   79.950892] Buffer I/O error on device sr1, logical block 793
Oct 10 11:28:21 pasglop kernel: [   79.950899] Buffer I/O error on device sr1, logical block 794
Oct 10 11:28:21 pasglop kernel: [   79.950906] Buffer I/O error on device sr1, logical block 795
Oct 10 11:28:21 pasglop kernel: [   79.950913] Buffer I/O error on device sr1, logical block 796
Oct 10 11:28:21 pasglop kernel: [   79.950921] Buffer I/O error on device sr1, logical block 797
Oct 10 11:28:21 pasglop kernel: [   79.950927] Buffer I/O error on device sr1, logical block 798

At the end, I think I yanked it out.

Cheers,
Ben.


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