linux-kernel - Re: [2.6.27-rc] USB storage: hangs and massive dmesg spews

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Date:	Fri, 8 Aug 2008 17:53:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jeff Garzik <jeff@...zik.org>
cc:	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.27-rc] USB storage:  hangs and massive dmesg spews

On Fri, 8 Aug 2008, Jeff Garzik wrote:

> Running kernel 2.6.27-rc1-00156-g94ad374 on x86-64, I
> 
> 1) plugged in a USB device
> 
> > Aug  8 15:32:03 core kernel: usb 1-8: new high speed USB device using ehci_hcd a
> > nd address 4
> > Aug  8 15:32:04 core kernel: usb 1-8: configuration #1 chosen from 1 choice
> > Aug  8 15:32:04 core kernel: usb 1-8: New USB device found, idVendor=041e, idPro
> > duct=4155
> > Aug  8 15:32:04 core kernel: usb 1-8: New USB device strings: Mfr=1, Product=2, 
> > SerialNumber=3
> > Aug  8 15:32:04 core kernel: usb 1-8: Product: ZEN Stone Plus
> > Aug  8 15:32:04 core kernel: usb 1-8: Manufacturer: CREATIVE
> > Aug  8 15:32:04 core kernel: usb 1-8: SerialNumber: F03A09331004CD04
> > Aug  8 15:32:04 core kernel: Initializing USB Mass Storage driver...
> [...]
> > scsi 10:0:0:0: Direct-Access     CREATIVE ZEN Stone Plus   1031 PQ: 0 ANSI: 4
> > sd 10:0:0:0: [sdc] 963968 2048-byte hardware sectors (1974 MB)
> > sd 10:0:0:0: [sdc] Write Protect is off
> > sd 10:0:0:0: [sdc] Mode Sense: 38 00 00 00
> > sd 10:0:0:0: [sdc] Assuming drive cache: write through
> 
> 
> 2) I executed: sudo dd if=/dev/sdc of=foo.img bs=32k
> 
> 
> 3) judging from ls(1), the entire storage device's contents was 
> successfully dumped to my hard drive.  HOWEVER, dd(1) sat in disk wait, 
> failing to end execution once the end of the USB storage device was reached.
> 
> 
> 4) a huge amount of dmesg spew followed.  at the time of this writing, 
> the following spew has been passed to dmesg over TWO HUNDRED times:
> 
> > Aug  8 15:41:01 core kernel: INFO: task usb-storage:21894 blocked for more than 
> > 120 seconds.

This has been fixed in 2.6.27-rc2.

Alan Stern

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