** Description changed:

  On an Ubuntu on LPAR s390x node, s2lp4, boot with Bionic kernel.
  
  When trying to run the ubuntu_stress_smoke test on it. This test will cause 
error like:
-   
/home/ubuntu/autotest/client/tests/ubuntu_stress_smoke_test/ubuntu_stress_smoke_test.sh:
 fork: retry: Resource temporarily unavailable
+   
/home/ubuntu/autotest/client/tests/ubuntu_stress_smoke_test/ubuntu_stress_smoke_test.sh:
 fork: retry: Resource temporarily unavailable
  
  Not sure which test is the cause, but the system will become very slow
- after running this test suite.
+ after running this test suite. And it seems that the test suite will
+ terminates itself before walking through all the test cases.
+ 
+ 1st run: terminates after the epoll test
+ 2nd run: crashed and rebooted after the branch test
+ 3rd run: terminates after the eventfd test
+ 4th run: terminates after the enosys test
  
  Command to run the test:
-   AUTOTEST_PATH=/home/ubuntu/autotest sudo -E autotest/client/autotest-local 
--verbose autotest/client/tests/ubuntu_stress_smoke_test/control
+   AUTOTEST_PATH=/home/ubuntu/autotest sudo -E autotest/client/autotest-local 
--verbose autotest/client/tests/ubuntu_stress_smoke_test/control
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-11-generic 4.15.0-11.12
  ProcVersionSignature: Ubuntu 4.15.0-11.12-generic 4.15.5
  Uname: Linux 4.15.0-11-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  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': 'aplay'
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  CurrentDmesg:
-  
+ 
  Date: Tue Mar  6 09:31:39 2018
  HibernationDevice: RESUME=UUID=e2735dd1-cbbc-4424-9c25-d37d073d9414
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
-  
+ 
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=38f7d570-2973-4055-b668-12a9ace1e0c7 
crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
-  linux-restricted-modules-4.15.0-11-generic N/A
-  linux-backports-modules-4.15.0-11-generic  N/A
-  linux-firmware                             1.172
+  linux-restricted-modules-4.15.0-11-generic N/A
+  linux-backports-modules-4.15.0-11-generic  N/A
+  linux-firmware                             1.172
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1753705

Title:
  stress-ng will make an Ubuntu on LPAR s390x Bionic system become very
  slow

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