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[nadrimajstor <ipejic@xxxxxxxxx>]

Not a fstrim issue per se... Looks like medium to high IO load will cause system to hang.
Interesting part of repeating error in kernel's log:

INFO: task md0_resync:27042 blocked for more than 120 seconds.
[5354986.546079]       Tainted: GF          O 3.13.0-35-generic #62-Ubuntu
[5354986.546107] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[5354986.546150] md0_resync      D ffff88107fc94440     0 27042      2 0x00000000
[5354986.546153]  ffff880010bc5bf8 0000000000000046 ffff880010a2c800 ffff880010bc5fd8
[5354986.546156]  0000000000014440 0000000000014440 ffff880010a2c800 ffff880125e7ea80
[5354986.546157]  ffff8810230b4438 ffff880010bc5c70 ffff8810230b4420 ffff8810230b43c0
[5354986.546159] Call Trace:
[5354986.546165]  [<ffffffff81722749>] schedule+0x29/0x70
[5354986.546176]  [<ffffffffa0070437>] sync_request+0x227/0xb30 [raid1]
[5354986.546180]  [<ffffffff810aafd0>] ? prepare_to_wait_event+0x100/0x100
[5354986.546184]  [<ffffffff815ab1a3>] md_do_sync+0x9a3/0xe00
[5354986.546186]  [<ffffffff815a7d48>] md_thread+0x118/0x130
[5354986.546188]  [<ffffffff815a7c30>] ? mddev_unlock+0xe0/0xe0
[5354986.546190]  [<ffffffff8108b4a2>] kthread+0xd2/0xf0
[5354986.546191]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
[5354986.546193]  [<ffffffff8172ecbc>] ret_from_fork+0x7c/0xb0
[5354986.546195]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0

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https://bugs.launchpad.net/bugs/1406290

Title:
  [fstrim] Server unavailable every sunday - needs hw reboot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Release:
    Ubuntu Server 14.04.1 LTS
  Kernel:
    3.13.0-35-generic #62-Ubuntu SMP x86_64 GNU/Linux
  Expected:
    Stable server on medium load.
  Observed:
    Every Sunday server freezes and needs hw reboot.

  Four INTEL SSDSC2BB480G4 in sw RAID6. EXT4 file system.

  Workaround:
  Disable fstrim job from weekly cron.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec  7 08:33 seq
   crw-rw---- 1 root audio 116, 33 Dec  7 08:33 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Mon Dec 29 15:35:46 2014
  HibernationDevice: RESUME=UUID=9a552e9f-593f-42f9-8b03-74c062d5fb3b
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-35-generic root=UUID=2541d2ca-44a9-4287-b5af-2e4dce628d96 ro nomodeset nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.6
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 01/03/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.0a
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  dmi.board.vendor: Supermicro
  dmi.board.version: 0123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd01/03/2014:svnSupermicro:pnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:pvr0123456789:rvnSupermicro:rnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:rvr0123456789:cvnSupermicro:ct17:cvr0123456789:
  dmi.product.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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