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[matteo sisti sette <1238969@xxxxxxxxxxxxxxxxxx>]

No, I can't reproduce it.
But I strongly suspect it's related to the high disk activity, as it's not the first time I experience a whole system hang while doing massive disk operations (i.e. copying tons of files from a disk to another).

Actually I doubt it's a kernel issue, I reported it against linux just
because I have no idea what package is responsible, and I don't know of
a name to use as argument to ubuntu-bug to report the bug generically
about ubuntu.

I can't test the mainline kernel as I can't reproduce the issue at will
in the first place.

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https://bugs.launchpad.net/bugs/1238969

Title:
  whose system frozen

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I had two terminal windows open, each one was executing a rsync
  command to copy relatively big amounts of data from a disk to another
  (they were transferring separate folders so they could not interfere
  with each other), and I had Thunderbird and Google Chrome and few
  other applications open.

  Suddenly the notebook's fan cooler's speed went down, the two rsyncs stopped progressing, and Thunderbird's window became greyed out and stopped responding.
  Then I tried opening a new tab in Google Chrome but it stopped responding too

  Then I moved the mouse to the left of the screen and the launcher
  showed up, but then the whole system stopped responding to mouse
  clicks. The launcher didn't hide when I moved the mouse away and at
  this point the whole system was frozen.

  It did respond to keyboard and I could hit Ctrl+Alt+F1 to open a virtual terminal.
  After entering the user name, the terminal got stuck too and it never prompted me for a password.

  The only thing I could do was to force power off.

  It looks like the freezing had to do with disk I/O.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-31-generic 3.8.0-31.46
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.4
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  teo        2735 F.... pulseaudio
  Date: Fri Oct 11 23:02:42 2013
  HibernationDevice: RESUME=UUID=b1b3e5fe-38e2-44c9-9e48-4564cd9f4d66
  InstallationDate: Installed on 2010-06-23 (1206 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: ASUSTeK Computer Inc. M51Sn
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-31-generic root=UUID=173acbf5-26a0-49e3-8d2b-f1c142582cbf ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-31-generic N/A
   linux-backports-modules-3.8.0-31-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-08-10 (62 days ago)
  dmi.bios.date: 12/24/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: M51Sn
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr303:bd12/24/2007:svnASUSTeKComputerInc.:pnM51Sn:pvr1.0:rvnASUSTeKComputerInc.:rnM51Sn:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: M51Sn
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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