Public bug reported:

Steps:
1. Run the ubuntu_stress_smoke_test
2. Try to remove everything in ~/autotest/client/tmp/

After the stress smoke test, an unremovable inode flag fill will be created in 
the temp directory:
~/autotest/client/tmp/ubuntu_stress_smoke_test/src/stress-ng/tmp-stress-ng-inode-flags-248463-2

# lsattr
-uS-i--------e-- ./stress-ng-inode-flags-248463-2-1540465499

On s390x instances, instead of re-deploying it, we will ask jenkins to remove 
the tmp directory.
Therefore this issue will cause the test to fail.

The solution for now is to run chattr -i on that file, so it can be
removed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-100-generic 4.4.0-100.123
ProcVersionSignature: Ubuntu 4.4.0-100.123-generic 4.4.95
Uname: Linux 4.4.0-100-generic s390x
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: 
ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Date: Mon Nov  6 02:39:35 2017
HibernationDevice: RESUME=UUID=f578fa27-1d57-41c9-bb1d-7ff64c1c9345
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=f26894a2-496d-4891-aa9a-f66344c77779 
crashkernel=196M BOOT_IMAGE=0
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-100-generic N/A
 linux-backports-modules-4.4.0-100-generic  N/A
 linux-firmware                             1.157.13
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Colin Ian King (colin-king)
         Status: Confirmed


** Tags: apport-bug package-from-proposed s390x third-party-packages xenial

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Description changed:

  Steps:
  1. Run the ubuntu_stress_smoke_test
  2. Try to remove everything in ~/autotest/client/tmp/
  
  After the stress smoke test, an unremovable inode flag fill will be created 
in the temp directory:
  
~/autotest/client/tmp/ubuntu_stress_smoke_test/src/stress-ng/tmp-stress-ng-inode-flags-248463-2
  
  # lsattr
  -uS-i--------e-- ./stress-ng-inode-flags-248463-2-1540465499
  
  On s390x instances, instead of re-deploying it, we will ask jenkins to remove 
the tmp directory.
  Therefore this issue will cause the test to fail.
+ 
+ The solution for now is to run chattr -i on that file, so it can be
+ removed.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-100-generic 4.4.0-100.123
  ProcVersionSignature: Ubuntu 4.4.0-100.123-generic 4.4.95
  Uname: Linux 4.4.0-100-generic s390x
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Mon Nov  6 02:39:35 2017
  HibernationDevice: RESUME=UUID=f578fa27-1d57-41c9-bb1d-7ff64c1c9345
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  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: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=f26894a2-496d-4891-aa9a-f66344c77779 
crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
-  linux-restricted-modules-4.4.0-100-generic N/A
-  linux-backports-modules-4.4.0-100-generic  N/A
-  linux-firmware                             1.157.13
+  linux-restricted-modules-4.4.0-100-generic N/A
+  linux-backports-modules-4.4.0-100-generic  N/A
+  linux-firmware                             1.157.13
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1730297

Title:
  ubuntu_stress_smoke_test will create an unremovable inode flag file on
  Xenial

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