Public bug reported:

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

Not sure which test is the cause, but the system will become very slow
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

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
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug bionic package-from-proposed s390x

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

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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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