** Description changed:

  THIS IS A POTENTIAL REGRESSION
  
  Steps:
  1. Deploy a Trusty amd64 node (node pepe in this case)
  2. sudo apt-get install git python-minimal -y
  3. git clone --depth=1 git://kernel.ubuntu.com/ubuntu/autotest-client-tests 
-b master-next
  4. git clone --depth=1 git://kernel.ubuntu.com/ubuntu/autotest
  5. rm -fr autotest/client/tests
  6. ln -sf ~/autotest-client-tests autotest/client/tests
  7. Monitor the syslog with tail -f /var/log/syslog
  8. AUTOTEST_PATH=/home/ubuntu/autotest sudo -E autotest/client/autotest-local 
--verbose autotest/client/tests/ubuntu_32_on_64/control.ubuntu
  
  Result:
  * The system will hang without any output in syslog. I can't see any error 
message from ipmi output as well.
  
  This test can pass with 3.13.0-139
  
+ Output:
+ ubuntu@pepe:~$ AUTOTEST_PATH=/home/ubuntu/autotest sudo -E 
autotest/client/autotest-local --verbose 
autotest/client/tests/ubuntu_32_on_64/control.ubuntu
+ 03:53:08 INFO | Writing results to 
/home/ubuntu/autotest/client/results/default
+ 03:53:08 DEBUG| Initializing the state engine
+ 03:53:08 DEBUG| Persistent state client.steps now set to []
+ 03:53:08 DEBUG| Persistent option harness now set to None
+ 03:53:08 DEBUG| Persistent option harness_args now set to None
+ 03:53:08 DEBUG| Selected harness: standalone
+ 03:53:08 INFO | START ----    ----    timestamp=1516333988    localtime=Jan 
19 03:53:08       
+ 03:53:08 DEBUG| Persistent state client._record_indent now set to 1
+ 03:53:08 INFO |       START   ubuntu_32_on_64 ubuntu_32_on_64 
timestamp=1516333988    localtime=Jan 19 03:53:08       
+ 03:53:08 DEBUG| Persistent state client._record_indent now set to 2
+ 03:53:08 DEBUG| Persistent state client.unexpected_reboot now set to 
('ubuntu_32_on_64', 'ubuntu_32_on_64')
+ 03:53:08 WARNI| Could not find GDB installed. Crash handling will operate 
with limited functionality
+ 03:53:08 DEBUG| Running 'apt-get install --yes --force-yes build-essential 
gcc-multilib'
+ 03:53:08 DEBUG| [stdout] Reading package lists...
+ 03:53:08 DEBUG| [stdout] Building dependency tree...
+ 03:53:08 DEBUG| [stdout] Reading state information...
+ 03:53:09 DEBUG| [stdout] build-essential is already the newest version.
+ 03:53:09 DEBUG| [stdout] gcc-multilib is already the newest version.
+ 03:53:09 DEBUG| [stdout] 0 upgraded, 0 newly installed, 0 to remove and 0 not 
upgraded.
+ 03:53:09 DEBUG| Running 'which gcc'
+ 03:53:09 DEBUG| [stdout] /usr/bin/gcc
+ 03:53:09 DEBUG| Running 
'/home/ubuntu/autotest/client/tmp/ubuntu_32_on_64/src/forkexec  date'
+ 
+ 
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-140-generic 3.13.0-140.189
  ProcVersionSignature: User Name 3.13.0-140.189-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-140-generic x86_64
  AlsaDevices:
-  total 0
-  crw-rw---- 1 root audio 116,  1 Jan 19 03:43 seq
-  crw-rw---- 1 root audio 116, 33 Jan 19 03:43 timer
+  total 0
+  crw-rw---- 1 root audio 116,  1 Jan 19 03:43 seq
+  crw-rw---- 1 root audio 116, 33 Jan 19 03:43 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.27
  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:
  Date: Fri Jan 19 03:44:08 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
-  Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
-  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
-  Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
+  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
+  Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. PowerEdge R310
  PciMultimedia:
-  
+ 
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-140-generic 
root=UUID=7b91a2b8-2e02-407e-a51d-766f6d969020 ro
  RelatedPackageVersions:
-  linux-restricted-modules-3.13.0-140-generic N/A
-  linux-backports-modules-3.13.0-140-generic  N/A
-  linux-firmware                              1.127.24
+  linux-restricted-modules-3.13.0-140-generic N/A
+  linux-backports-modules-3.13.0-140-generic  N/A
+  linux-firmware                              1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/17/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.8.2
  dmi.board.name: 05XKKK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.8.2:bd08/17/2011:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R310
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1744199

Title:
  ubuntu_32_on_64 test crash Trusty 3.13.0-140 amd64 system

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