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[Vladimir Rutsky <1267648@xxxxxxxxxxxxxxxxxx>]

Here is recent question describing this issue:
http://askubuntu.com/questions/397249/system-freezes-unresponsive-
unusable-when-copying-large-file-to-usb

I tried to reduce cache size up to

vm.dirty_background_ratio = 2
vm.dirty_ratio = 5

--- system became much more usable when files being copied, but still
laggy (e.g. tabs switching in gnome-terminal hangs, text input freezes
on several seconds in Firefox).

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https://bugs.launchpad.net/bugs/1267648

Title:
  Copying large amount of files to USB stick makes system laggy or even
  freeze/hang (temporary)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  How to reproduce:

  1. Create large enough temporary file:

  $ dd if=/dev/zero of=/tmp/zeroes bs=8196 count=1000000
  1000000+0 records in
  1000000+0 records out
  8196000000 bytes (8.2 GB) copied, 31.5395 s, 260 MB/s

  2. Mount USB stick/external USB hard drive.
  3. Start copy to external device:
  $ cp /tmp/zeroes /media/bob/16\ GB\ USB\ 3.0/

  Expected behaviour: file being copying in background for a quite a lot of time (since USB sticks not so fast) not interrupting other work on system.
  Observed behaviour: after some time of copying system starts to lag --- mouse cursor jerking, alt+tab lags, windows became dimmed, music lags.
  If I try to copy around 20 GB of files (e.g. photoes collections) system became almost completely unresponsive and I can observe in syslog following messages:

  Jan  9 02:36:19 bob-laptop kernel: [120872.200909] INFO: task kworker/u16:1:15378 blocked for more than 120 seconds.
  Jan  9 02:36:19 bob-laptop kernel: [120872.200955] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Jan  9 02:36:19 bob-laptop kernel: [120872.200997] kworker/u16:1   D ffff88025f254580     0 15378      2 0x00000000
  Jan  9 02:36:19 bob-laptop kernel: [120872.201046]  ffff880159bebc10 0000000000000046 ffff880159bebfd8 0000000000014580
  Jan  9 02:36:19 bob-laptop kernel: [120872.201090]  ffff880159bebfd8 0000000000014580 ffff880218c6aee0 7fffffffffffffff
  Jan  9 02:36:19 bob-laptop kernel: [120872.201134]  ffff880159bebd68 ffff880159bebd70 ffff880218c6aee0 ffff880159bebde0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201178] Call Trace:
  Jan  9 02:36:19 bob-laptop kernel: [120872.201200]  [<ffffffff816ec5b9>] schedule+0x29/0x70
  Jan  9 02:36:19 bob-laptop kernel: [120872.201229]  [<ffffffff816ea499>] schedule_timeout+0x239/0x2d0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201263]  [<ffffffff81091ac8>] ? resched_task+0x28/0x80
  Jan  9 02:36:19 bob-laptop kernel: [120872.201294]  [<ffffffff81092555>] ? check_preempt_curr+0x75/0xa0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201327]  [<ffffffff81092599>] ? ttwu_do_wakeup+0x19/0xd0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201362]  [<ffffffff816eca4d>] wait_for_completion+0xad/0x120
  Jan  9 02:36:19 bob-laptop kernel: [120872.201396]  [<ffffffff81094520>] ? wake_up_state+0x20/0x20
  Jan  9 02:36:19 bob-laptop kernel: [120872.201429]  [<ffffffff81084606>] kthread_create_on_node+0xa6/0x120
  Jan  9 02:36:19 bob-laptop kernel: [120872.201467]  [<ffffffff8107de90>] ? manage_workers.isra.25+0x2a0/0x2a0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201503]  [<ffffffff8107da5b>] create_worker+0xeb/0x200
  Jan  9 02:36:19 bob-laptop kernel: [120872.201533]  [<ffffffff8107027c>] ? mod_timer+0x13c/0x210
  Jan  9 02:36:19 bob-laptop kernel: [120872.201563]  [<ffffffff8107dd42>] manage_workers.isra.25+0x152/0x2a0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201598]  [<ffffffff8107e20a>] worker_thread+0x37a/0x3c0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201632]  [<ffffffff8107de90>] ? manage_workers.isra.25+0x2a0/0x2a0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201668]  [<ffffffff81084740>] kthread+0xc0/0xd0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201697]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
  Jan  9 02:36:19 bob-laptop kernel: [120872.201734]  [<ffffffff816f716c>] ret_from_fork+0x7c/0xb0
  Jan  9 02:36:19 bob-laptop kernel: [120872.201765]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120

  Lagging stops when copying finishes.

  This issue observed with all tested USB storage devices (two USB
  sticks and one external USB-HDD), in both USB 2 and USB 3 ports, with
  destination filesystem ext4 and NTFS.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.23
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bob       20835 F.... pulseaudio
                        bob       27269 F.... pulseaudio
   /dev/snd/pcmC0D0p:   bob       20835 F...m pulseaudio
  CheckboxSubmission: 3d16077c4fdd6a017d47f6e3dc4f3c54
  CheckboxSystem: b633b4f40868d491c2ae5b50030ce6f3
  Date: Fri Jan 10 04:05:31 2014
  HibernationDevice: RESUME=UUID=e4b8cb86-0729-4f43-896f-89d9216cbc0f
  InstallationDate: Installed on 2014-01-01 (8 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Sony Corporation SVS1311S9RB
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-15-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/17/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: R0142C5
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnInsydeCorp.:bvrR0142C5:bd05/17/2012:svnSonyCorporation:pnSVS1311S9RB:pvrC60ARA3P:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: SVS1311S9RB
  dmi.product.version: C60ARA3P
  dmi.sys.vendor: Sony Corporation

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