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[Steve <lp@xxxxxxxxxxxxxx>]

fixed in: v3.16-rc3
fixed in: v3.14.5
fixed in: v3.14.0
fixed in: v3.14.0rc1
broken in: v3.13.11.4 [the most recent v3.13 kernel]
broken in v3.13.0 [the earliest v3.13 kernel, without going into the rc versions]
fixed in: 3.12.22 [one of the more recent 3.12 kernels; was the most recent at the time I had tried it]
[and broken in all other v3.13 versions I had tried]

At this point it looks like it's something that is special only to 3.13
(possibly some commit that was applied into 3.13 at an early time, never
made it into 3.14 branch or was rewritten in 3.14...?) At this point,
I'm not planning on testing more kernels since it seems like this is the
pattern.

Looking at http://kernelnewbies.org/Linux_3.13 - there were some major
changes around both "Improved performance in NUMA systems" (this is a
multi-processor system) and "Improved page table access scalability in
hugepage workloads" (this does have 256gb of memory); one guess is that
there could be something in those changes that was redesigned in 3.14 to
work better(?) (though scanning through the top features in 3.14 nothing
is jumping out to me...?)

-- 
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https://bugs.launchpad.net/bugs/1332409

Title:
  [Supermicro X9DR3-F] Virtual machines hang in kernel 3.13

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Multi-cpu systems are experiencing guest kernels hanging/crashing
  (both windows & linux guests) in kernel 3.13. (Windows guests are
  getting bluescreens, linux guests just seem to be locking up).

  Downgrading to 3.12 eliminates the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-lowlatency 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-lowlatency 3.13.11.2
  Uname: Linux 3.13.0-29-lowlatency x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jun 18 16:43 seq
   crw-rw---- 1 root audio 116, 33 Jun 18 16:43 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.2
  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: Fri Jun 20 01:07:59 2014
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Supermicro X9DR3-F
  PciMultimedia:

  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-lowlatency root=UUID=0d5098de-e0c2-4884-bf6a-5d68f9ad5266 ro console=tty1 console=ttyS1,115200n8 nomodeset rootdelay=15 text nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-lowlatency N/A
   linux-backports-modules-3.13.0-29-lowlatency  N/A
   linux-firmware                                1.127.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-19 (61 days ago)
  dmi.bios.date: 07/31/2013
  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: X9DR3-F
  dmi.board.vendor: Supermicro
  dmi.board.version: 0123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd07/31/2013:svnSupermicro:pnX9DR3-F:pvr0123456789:rvnSupermicro:rnX9DR3-F:rvr0123456789:cvnSupermicro:ct3:cvr0123456789:
  dmi.product.name: X9DR3-F
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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