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

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Date:	Tue, 27 Apr 2010 12:46:14 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	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

Hello,

On (04/26/10 15:36), Alan Stern wrote:
> Can you do this with CONFIG_USB_DEBUG enabled?  And acquire a usbmon 
> trace at the same time (see Documentation/usb/usbmon.txt)?
> 

mount as /media/fl/
cp ./LLVM 2.0.mp4 /media/fl/    - (246M)
umount /media/fl/

Please see usbmon.log attached.

kernel: [ 3228.543190] usb 2-2: new full speed USB device using uhci_hcd and address 4
kernel: [ 3228.689814] usb 2-2: ep0 maxpacket = 16
kernel: [ 3228.712027] usb 2-2: default language 0x0409
kernel: [ 3228.731035] usb 2-2: udev 4, busnum 2, minor = 131
kernel: [ 3228.731043] usb 2-2: New USB device found, idVendor=0b05, idProduct=422f
kernel: [ 3228.731051] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
kernel: [ 3228.731058] usb 2-2: Product: Generic Mass Storage
kernel: [ 3228.731064] usb 2-2: Manufacturer: ASUS
kernel: [ 3228.731070] usb 2-2: SerialNumber: 7abf5000-2268-0801-3b00-072fa733ffff
kernel: [ 3228.731640] usb 2-2: usb_probe_device
kernel: [ 3228.731649] usb 2-2: configuration #1 chosen from 1 choice
kernel: [ 3228.733180] usb 2-2: adding 2-2:1.0 (config #1, interface 0)
kernel: [ 3228.733661] usb-storage 2-2:1.0: usb_probe_interface
kernel: [ 3228.733677] usb-storage 2-2:1.0: usb_probe_interface - got id
kernel: [ 3228.734213] scsi4 : usb-storage 2-2:1.0
kernel: [ 3229.738138] scsi scan: INQUIRY result too short (5), using 36
kernel: [ 3229.738154] scsi 4:0:0:0: Direct-Access                                    PQ: 0 ANSI: 0
kernel: [ 3229.746458] sd 4:0:0:0: Attached scsi generic sg2 type 0
kernel: [ 3229.750731] sd 4:0:0:0: [sdb] 2012160 512-byte logical blocks: (1.03 GB/982 MiB)
kernel: [ 3229.754031] sd 4:0:0:0: [sdb] Write Protect is off
kernel: [ 3229.754036] sd 4:0:0:0: [sdb] Mode Sense: 00 06 00 00
kernel: [ 3229.754039] sd 4:0:0:0: [sdb] Assuming drive cache: write through
kernel: [ 3229.766121] sd 4:0:0:0: [sdb] Assuming drive cache: write through
kernel: [ 3229.766134]  sdb: sdb1
kernel: [ 3229.790123] sd 4:0:0:0: [sdb] Assuming drive cache: write through
kernel: [ 3229.790135] sd 4:0:0:0: [sdb] Attached SCSI removable disk
kernel: [ 3247.991259] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
kernel: [ 3840.643117] INFO: task umount:4902 blocked for more than 120 seconds.
kernel: [ 3840.643125] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kernel: [ 3840.643133] umount        D 0000034e     0  4902   3943 0x00000000
kernel: [ 3840.643146]  f640de38 00000046 3715ce5d 0000034e c1610cc0 c12c3938 c1610cc0 c1610cc0
kernel: [ 3840.643170]  c1610cc0 c1610cc0 f51017d0 c1610cc0 00012bf1 00000000 3714a26c 0000034e
kernel: [ 3840.643193]  f5101540 f640de40 f640de70 00000000 f640de78 f640de40 c10b7cf0 f640de5c
kernel: [ 3840.643215] Call Trace:
kernel: [ 3840.643234]  [<c12c3938>] ? _raw_spin_unlock_irqrestore+0x36/0x5b
kernel: [ 3840.643249]  [<c10b7cf0>] bdi_sched_wait+0x8/0xc
kernel: [ 3840.643259]  [<c12c2197>] __wait_on_bit+0x34/0x5b
kernel: [ 3840.643268]  [<c10b7ce8>] ? bdi_sched_wait+0x0/0xc
kernel: [ 3840.643279]  [<c12c2215>] out_of_line_wait_on_bit+0x57/0x5f
kernel: [ 3840.643289]  [<c10b7ce8>] ? bdi_sched_wait+0x0/0xc
kernel: [ 3840.643302]  [<c103fa75>] ? wake_bit_function+0x0/0x4d
kernel: [ 3840.643313]  [<c10b84d4>] wait_on_bit.clone.0+0x17/0x23
kernel: [ 3840.643323]  [<c10b8544>] sync_inodes_sb+0x64/0x10d
kernel: [ 3840.643337]  [<c10d373f>] ? vfs_quota_sync+0x0/0x1da
kernel: [ 3840.643348]  [<c10baef6>] __sync_filesystem+0x37/0x62
kernel: [ 3840.643358]  [<c10bb062>] sync_filesystem+0x3c/0x3f
kernel: [ 3840.643369]  [<c10a2def>] generic_shutdown_super+0x1c/0xca
kernel: [ 3840.643380]  [<c10a2eba>] kill_block_super+0x1d/0x31
kernel: [ 3840.643390]  [<c10a3833>] deactivate_super+0x48/0x5a
kernel: [ 3840.643401]  [<c10b385c>] mntput_no_expire+0x5e/0x89
kernel: [ 3840.643411]  [<c10b41cf>] sys_umount+0x277/0x29b
kernel: [ 3840.643423]  [<c10b4200>] sys_oldumount+0xd/0xf
kernel: [ 3840.643434]  [<c1002813>] sysenter_do_call+0x12/0x32
kernel: [ 3840.643444] 1 lock held by umount/4902:
kernel: [ 3840.643449]  #0:  (&type->s_umount_key#24){++++..}, at: [<c10a382e>] deactivate_super+0x43/0x5a


	Sergey
View attachment "usbmon.log" of type "text/plain" (77184 bytes)

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