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List:       linux-usb-devel
Subject:    Re: [linux-usb-devel] USB 2 External HD - Random Disconnects [Repost}
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2004-04-19 21:04:29
Message-ID: Pine.LNX.4.44L0.0404191654510.967-100000 () ida ! rowland ! org
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On Mon, 19 Apr 2004, Oliver Strutynski wrote:

> Ok, here's more info. Compiled with debugging turned on. Actually took me 
> pretty long to trigger the error.
> 
> The first log starts with the first message in /var/log/messages right after 
> plugging in the device and until right after the successful mount.
> 
> The second one shows the last WRITE commands before writing fails and the 
> error messages. Everything in between looks normal to me. I triggered the bug 
> by copying data TO the HD.
> 
> The HD does not seem to have a Genesys chip, so I tried to manually apply the 
> patch. But that did not work out. These logs were taken with the 
> default .max_sectors=240.
> 
> Oliver 

Yes, that doesn't seem to be related to this problem.

> Apr 19 21:25:56 zi432 kernel: usb-storage: *** thread awakened.
> Apr 19 21:25:56 zi432 kernel: usb-storage: Command WRITE_10 (10 bytes)
> Apr 19 21:25:56 zi432 kernel: usb-storage:  2a 00 00 00 ce 60 00 00 08 00
> Apr 19 21:25:56 zi432 kernel: usb-storage: Bulk Command S 0x43425355 T 0x1892d 
> L 4096 F 0 Trg 0 LUN 0 CL 10
> Apr 19 21:25:56 zi432 kernel: usb-storage: usb_stor_bulk_transfer_buf: xfer 31 
> bytes
> Apr 19 21:25:56 zi432 kernel: usb-storage: Status code -71; transferred 0/31
> **********************************
> first error
> **********************************

71 is EPROTO, meaning that some low-level error occurred.  Most likely the 
device simply failed to respond to the packet.

> Apr 19 21:25:56 zi432 kernel: usb-storage: -- unknown error.
> Apr 19 21:25:56 zi432 kernel: usb-storage: Bulk command transfer result=4
> Apr 19 21:25:56 zi432 kernel: usb-storage: -- transport indicates error, 
> resetting
> Apr 19 21:25:56 zi432 kernel: usb-storage: usb_stor_Bulk_reset called
> Apr 19 21:25:56 zi432 kernel: usb-storage: usb_stor_control_msg: rq=ff 
> rqtype=21 value=0000 index=00 len=0
> Apr 19 21:25:56 zi432 kernel: usb-storage: Soft reset failed: -71
> Apr 19 21:25:56 zi432 kernel: usb-storage: scsi cmd done, result=0x70000
> Apr 19 21:25:56 zi432 kernel: usb-storage: *** thread sleeping.

It looks to me like the device just crashed.  It doesn't respond to 
anything else from then on.  Later on your log shows the device 
disconnecting itself electrically from the bus.

It's possible that you're seeing some sort of interference affecting the 
USB signals.  You should check all your cables and connections, just in 
case.  But more likely it's a deeper problem with the drive.

Alan Stern





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