linux-kernel - Re: INFO: umount blocked for more than 120 seconds

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Date:	Mon, 26 Apr 2010 15:36:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: INFO: umount blocked for more than 120 seconds

On Mon, 26 Apr 2010, Sergey Senozhatsky wrote:

> Hello,
> MiniSD card mounted through the USB card reader.
> 
> .34-rc5-git6
> 
> kernel: [ 5746.170226] scsi12 : usb-storage 2-2:1.0
> kernel: [ 5747.174113] scsi scan: INQUIRY result too short (5), using 36
> kernel: [ 5747.174128] scsi 12:0:0:0: Direct-Access                                    PQ: 0 ANSI: 0
> kernel: [ 5747.180721] sd 12:0:0:0: Attached scsi generic sg2 type 0
> kernel: [ 5747.190490] sd 12:0:0:0: [sdb] 2012160 512-byte logical blocks: (1.03 GB/982 MiB)
> kernel: [ 5747.193398] sd 12:0:0:0: [sdb] Write Protect is off
> kernel: [ 5747.193403] sd 12:0:0:0: [sdb] Mode Sense: 00 06 00 00
> kernel: [ 5747.193406] sd 12:0:0:0: [sdb] Assuming drive cache: write through
> kernel: [ 5747.207116] sd 12:0:0:0: [sdb] Assuming drive cache: write through
> kernel: [ 5747.207125]  sdb: sdb1
> kernel: [ 5747.233099] sd 12:0:0:0: [sdb] Assuming drive cache: write through
> kernel: [ 5747.233112] sd 12:0:0:0: [sdb] Attached SCSI removable disk
> kernel: [ 5758.495211] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
> kernel: [ 6360.626229] INFO: task umount:4235 blocked for more than 120 seconds.
> kernel: [ 6360.626237] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Is this repeatable?

Can you do this with CONFIG_USB_DEBUG enabled?  And acquire a usbmon 
trace at the same time (see Documentation/usb/usbmon.txt)?

Alan Stern

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