Public bug reported:
I have tried using dd to wipe my usb key a few times today and noticed
it kept seeming to lock up the system and make it very slow. I played
around with it some and found the following:
If I use oflag=dsync it is nice and fast, no problems.
date -R; time dd if=/dev/zero of=/dev/sdb oflag=dsync bs=1M count=1024; date -R
Thu, 25 Jun 2009 15:04:53 -0500
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 94.6186 s, 11.3 MB/s
real 1m34.624s
user 0m0.004s
sys 0m2.944s
Thu, 25 Jun 2009 15:06:28 -0500
--
However if I do just a regular dd without oflag=dsync it seems to get
stuck and takes a very long time it is at least 4x slower and possibly
never finishes (I didn't wait that long).
date -R; time dd if=/dev/zero of=/dev/sdb bs=1M count=1024; date -R
Thu, 25 Jun 2009 15:09:22 -0500
It was still going as of Thu, 25 Jun 2009 15:15:56 -0500
--
I looked in the kern.log after running the dd without oflag=dsync and
found the following:
Jun 25 14:58:18 x200 kernel: [ 1820.424149] usb 2-2: new high speed USB device
using ehci_hcd and address 5
Jun 25 14:58:18 x200 kernel: [ 1820.557850] usb 2-2: configuration #1 chosen
from 1 choice
Jun 25 14:58:18 x200 kernel: [ 1820.558328] scsi5 : SCSI emulation for USB Mass
Storage devices
Jun 25 14:58:18 x200 kernel: [ 1820.558830] usb-storage: device found at 5
Jun 25 14:58:18 x200 kernel: [ 1820.558835] usb-storage: waiting for device to
settle before scanning
Jun 25 14:58:23 x200 kernel: [ 1825.556492] usb-storage: device scan complete
Jun 25 14:58:23 x200 kernel: [ 1825.557236] scsi 5:0:0:0: Direct-Access
Ut165 USB2FlashStorage 0.00 PQ: 0 ANSI: 2
Jun 25 14:58:23 x200 kernel: [ 1825.559575] sd 5:0:0:0: Attached scsi generic
sg1 type 0
Jun 25 14:58:23 x200 kernel: [ 1825.559903] sd 5:0:0:0: [sdb] 15794176 512-byte
hardware sectors: (8.08 GB/7.53 GiB)
Jun 25 14:58:23 x200 kernel: [ 1825.561315] sd 5:0:0:0: [sdb] Write Protect is
off
Jun 25 14:58:23 x200 kernel: [ 1825.561323] sd 5:0:0:0: [sdb] Mode Sense: 00 00
00 00
Jun 25 14:58:23 x200 kernel: [ 1825.561329] sd 5:0:0:0: [sdb] Assuming drive
cache: write through
Jun 25 14:58:23 x200 kernel: [ 1825.569440] sd 5:0:0:0: [sdb] Assuming drive
cache: write through
Jun 25 14:58:23 x200 kernel: [ 1825.569453] sdb: unknown partition table
Jun 25 14:58:23 x200 kernel: [ 1825.758141] sd 5:0:0:0: [sdb] Attached SCSI
removable disk
Jun 25 15:13:58 x200 kernel: [ 2760.552137] INFO: task devkit-disks-da:4498
blocked for more than 120 seconds.
Jun 25 15:13:58 x200 kernel: [ 2760.552146] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 25 15:13:58 x200 kernel: [ 2760.552153] devkit-disks- D 0000000100087de5
0 4498 4492
Jun 25 15:13:58 x200 kernel: [ 2760.552165] ffff8801300a7c58 0000000000000086
0000000000000001 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552175] ffff880126035d68 0000000000013000
0000000000013000 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552184] 0000000000013000 0000000000013000
ffff880126035d68 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552193] Call Trace:
Jun 25 15:13:58 x200 kernel: [ 2760.552213] [<ffffffff806da977>]
__mutex_lock_slowpath+0xd7/0x160
Jun 25 15:13:58 x200 kernel: [ 2760.552225] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552233] [<ffffffff806da696>]
mutex_lock+0x26/0x50
Jun 25 15:13:58 x200 kernel: [ 2760.552240] [<ffffffff80328858>]
__blkdev_get+0x38/0x3a0
Jun 25 15:13:58 x200 kernel: [ 2760.552251] [<ffffffff80212bce>] ?
apic_timer_interrupt+0xe/0x20
Jun 25 15:13:58 x200 kernel: [ 2760.552259] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552266] [<ffffffff80328bcb>]
blkdev_get+0xb/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552273] [<ffffffff80328c3c>]
blkdev_open+0x6c/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552283] [<ffffffff802fa066>]
__dentry_open+0xe6/0x2e0
Jun 25 15:13:58 x200 kernel: [ 2760.552291] [<ffffffff802fa367>]
nameidata_to_filp+0x57/0x70
Jun 25 15:13:58 x200 kernel: [ 2760.552301] [<ffffffff803093ba>]
do_filp_open+0x28a/0x9c0
Jun 25 15:13:58 x200 kernel: [ 2760.552308] [<ffffffff8032797d>] ?
bdput+0xd/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552316] [<ffffffff8032813e>] ?
__blkdev_put+0x7e/0x1a0
Jun 25 15:13:58 x200 kernel: [ 2760.552323] [<ffffffff8032826b>] ?
blkdev_put+0xb/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552333] [<ffffffff8043e452>] ?
__strncpy_from_user+0x22/0x60
Jun 25 15:13:58 x200 kernel: [ 2760.552342] [<ffffffff80313a32>] ?
alloc_fd+0x102/0x150
Jun 25 15:13:58 x200 kernel: [ 2760.552350] [<ffffffff802f9ea0>]
do_sys_open+0x60/0xf0
Jun 25 15:13:58 x200 kernel: [ 2760.552358] [<ffffffff802f9f5b>]
sys_open+0x1b/0x20
Jun 25 15:13:58 x200 kernel: [ 2760.552366] [<ffffffff80212042>]
system_call_fastpath+0x16/0x1b
Jun 25 15:13:58 x200 kernel: [ 2760.552376] INFO: task hald-addon-stor:5375
blocked for more than 120 seconds.
Jun 25 15:13:58 x200 kernel: [ 2760.552381] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 25 15:13:58 x200 kernel: [ 2760.552387] hald-addon-st D 0000000100087de5
0 5375 3793
Jun 25 15:13:58 x200 kernel: [ 2760.552397] ffff88012a581c58 0000000000000082
0000000000000002 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552407] ffff8801390603a8 0000000000013000
0000000000013000 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552416] 0000000000013000 0000000000013000
ffff8801390603a8 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552425] Call Trace:
Jun 25 15:13:58 x200 kernel: [ 2760.552434] [<ffffffff806da977>]
__mutex_lock_slowpath+0xd7/0x160
Jun 25 15:13:58 x200 kernel: [ 2760.552442] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552450] [<ffffffff806da696>]
mutex_lock+0x26/0x50
Jun 25 15:13:58 x200 kernel: [ 2760.552457] [<ffffffff80328858>]
__blkdev_get+0x38/0x3a0
Jun 25 15:13:58 x200 kernel: [ 2760.552464] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552472] [<ffffffff80328bcb>]
blkdev_get+0xb/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552479] [<ffffffff80328c3c>]
blkdev_open+0x6c/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552487] [<ffffffff802fa066>]
__dentry_open+0xe6/0x2e0
Jun 25 15:13:58 x200 kernel: [ 2760.552495] [<ffffffff802fa367>]
nameidata_to_filp+0x57/0x70
Jun 25 15:13:58 x200 kernel: [ 2760.552503] [<ffffffff803093ba>]
do_filp_open+0x28a/0x9c0
Jun 25 15:13:58 x200 kernel: [ 2760.552510] [<ffffffff8032813e>] ?
__blkdev_put+0x7e/0x1a0
Jun 25 15:13:58 x200 kernel: [ 2760.552518] [<ffffffff8032826b>] ?
blkdev_put+0xb/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552526] [<ffffffff8043e452>] ?
__strncpy_from_user+0x22/0x60
Jun 25 15:13:58 x200 kernel: [ 2760.552534] [<ffffffff80313a32>] ?
alloc_fd+0x102/0x150
Jun 25 15:13:58 x200 kernel: [ 2760.552542] [<ffffffff802f9ea0>]
do_sys_open+0x60/0xf0
Jun 25 15:13:58 x200 kernel: [ 2760.552550] [<ffffffff802f9f5b>]
sys_open+0x1b/0x20
Jun 25 15:13:58 x200 kernel: [ 2760.552558] [<ffffffff80212042>]
system_call_fastpath+0x16/0x1b
Jun 25 15:13:58 x200 kernel: [ 2760.552565] INFO: task blkid:5785 blocked for
more than 120 seconds.
Jun 25 15:13:58 x200 kernel: [ 2760.552570] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 25 15:13:58 x200 kernel: [ 2760.552575] blkid D ffffffffffffffff
0 5785 1
Jun 25 15:13:58 x200 kernel: [ 2760.552586] ffff8800b2c93c58 0000000000000082
ffff8800b2c93e48 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552595] ffff88012608b088 0000000000013000
0000000000013000 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552604] 0000000000013000 0000000000013000
ffff88012608b088 0000000000013000
Jun 25 15:13:58 x200 kernel: [ 2760.552613] Call Trace:
Jun 25 15:13:58 x200 kernel: [ 2760.552622] [<ffffffff806da977>]
__mutex_lock_slowpath+0xd7/0x160
Jun 25 15:13:58 x200 kernel: [ 2760.552630] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552639] [<ffffffff806da696>]
mutex_lock+0x26/0x50
Jun 25 15:13:58 x200 kernel: [ 2760.552646] [<ffffffff80328858>]
__blkdev_get+0x38/0x3a0
Jun 25 15:13:58 x200 kernel: [ 2760.552653] [<ffffffff80328bd0>] ?
blkdev_open+0x0/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552660] [<ffffffff80328bcb>]
blkdev_get+0xb/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552667] [<ffffffff80328c3c>]
blkdev_open+0x6c/0xc0
Jun 25 15:13:58 x200 kernel: [ 2760.552675] [<ffffffff802fa066>]
__dentry_open+0xe6/0x2e0
Jun 25 15:13:58 x200 kernel: [ 2760.552684] [<ffffffff802fa367>]
nameidata_to_filp+0x57/0x70
Jun 25 15:13:58 x200 kernel: [ 2760.552692] [<ffffffff803093ba>]
do_filp_open+0x28a/0x9c0
Jun 25 15:13:58 x200 kernel: [ 2760.552702] [<ffffffff8022f479>] ?
default_spin_lock_flags+0x9/0x10
Jun 25 15:13:58 x200 kernel: [ 2760.552710] [<ffffffff8043e452>] ?
__strncpy_from_user+0x22/0x60
Jun 25 15:13:58 x200 kernel: [ 2760.552718] [<ffffffff80313a32>] ?
alloc_fd+0x102/0x150
Jun 25 15:13:58 x200 kernel: [ 2760.552726] [<ffffffff802f9ea0>]
do_sys_open+0x60/0xf0
Jun 25 15:13:58 x200 kernel: [ 2760.552734] [<ffffffff802f9f5b>]
sys_open+0x1b/0x20
Jun 25 15:13:58 x200 kernel: [ 2760.552742] [<ffffffff80212042>]
system_call_fastpath+0x16/0x1b
ProblemType: Bug
Architecture: amd64
Date: Thu Jun 25 15:22:23 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=13321251-9192-4083-a9c0-580da4025a03
MachineType: LENOVO 7454CTO
Package: linux-image-2.6.30-10-generic 2.6.30-10.12
ProcCmdLine: root=UUID=f9297094-3bdd-47ab-bd51-f8b1c9388d21 ro quiet splash
nomodeset
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.30-10.12-generic
RelatedPackageVersions: linux-backports-modules-2.6.30-10-generic N/A
SourcePackage: linux
Uname: Linux 2.6.30-10-generic x86_64
dmi.bios.date: 04/20/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 6DET51WW (3.01 )
dmi.board.name: 7454CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr6DET51WW(3.01):bd04/20/2009:svnLENOVO:pn7454CTO:pvrThinkPadX200:rvnLENOVO:rn7454CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7454CTO
dmi.product.version: ThinkPad X200
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug
--
dd extremely slow writing to usb key without oflag=dsync
https://bugs.launchpad.net/bugs/392288
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
