ubuntu_vfat_stress will pass even with error reported by stress-ng

[Po-Hsu Lin]

The test will pass even with stress-ng complaining about "No space left on device", not sure if this is an expected behaviour, but it might be confusing to testers.

 stress-ng: info: [36588] dispatching hogs: 2 hdd, 2 lockf, 2 seek, 2 aio, 2 dentry, 2 dir, 2 fallocate, 2 fstat, 2 lease, 2 open, 2 rename, 2 chdir, 2 rename
 stress-ng: fail: [36609] stress-ng-chdir: mkdir failed, errno=28 (No space left on device)
 stress-ng: fail: [36623] stress-ng-chdir: mkdir failed, errno=28 (No space left on device)
 stress-ng: fail: [36611] stress-ng-hdd: read failed, errno=28 (No space left on device)
 stress-ng: error: [36588] process 36611 (stress-ng-hdd) terminated with an error, exit status=1 (stress-ng core failure)
 stress-ng: error: [36588] process [36609] (stress-ng-chdir) aborted early, out of system resources
 stress-ng: error: [36588] process [36623] (stress-ng-chdir) aborted early, out of system resources
 stress-ng: info: [36588] unsuccessful run completed in 14.35s
 stress-ng: info: [36588] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s
 stress-ng: info: [36588] (secs) (secs) (secs) (real time) (usr+sys time)
 stress-ng: info: [36588] hdd 16391 7.39 0.44 6.44 2218.21 2382.41
 stress-ng: info: [36588] lockf 131604 10.16 0.05 12.43 12947.00 10545.19
 stress-ng: info: [36588] seek 1987284 10.17 1.33 10.40 195448.06 169418.93
 stress-ng: info: [36588] aio 2496 10.15 0.00 0.00 245.83 0.00
 stress-ng: info: [36588] dentry 171 10.42 0.00 0.61 16.41 280.33
 stress-ng: info: [36588] dir 2539 14.09 0.00 15.40 180.14 164.87
 stress-ng: info: [36588] fallocate 170 10.17 0.04 5.35 16.71 31.54
 stress-ng: info: [36588] fstat 2147 10.00 0.02 0.26 214.64 7667.86
 stress-ng: info: [36588] lease 66 10.14 0.61 5.15 6.51 11.46
 stress-ng: info: [36588] open 1434208 10.11 0.44 12.20 141807.28 113465.82
 stress-ng: info: [36588] rename 6526 10.01 0.00 2.94 651.86 2219.73
 stress-ng: info: [36588] rename 6820 10.00 0.00 2.49 681.85 2738.96
 stress-ng: info: [36588] for a 14.35s run time:
 stress-ng: info: [36588] 114.80s available CPU time
 stress-ng: info: [36588] 3.05s user time ( 2.66%)
 stress-ng: info: [36588] 75.50s system time ( 65.77%)
 stress-ng: info: [36588] 78.55s total time ( 68.43%)
 stress-ng: info: [36588] load average: 17.49 10.98 4.90
 Stress-ng stressor failed, error: 2
 umounting vfat /mnt/vfat-test-29590
 umounting tmpfs /mnt/vfat-test-29590
 ================================================================================

 Completed

 Kernel issues: NONE

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-139-generic 4.4.0-139.165
ProcVersionSignature: Ubuntu 4.4.0-139.165-generic 4.4.160
Uname: Linux 4.4.0-139-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: 2.20.1-0ubuntu2.18
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.
CurrentDmesg:

Date: Fri Nov 2 08:20:40 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=44b0b919-a1a4-4849-9425-e71d4ac87d85 crashkernel=196M nobp=1 BOOT_IMAGE=0
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-139-generic N/A
 linux-backports-modules-4.4.0-139-generic N/A
 linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1801347

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Colin Ian King (colin-king)]

This is intentional behavior as the test is seeing how to deal with file operations when a block device is full.

[Po-Hsu Lin (cypressyew)]

OK, so I think we can just rely on the report and the return value.
Thanks!

[Colin Ian King (colin-king)]

Fix committed: http://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=7358ec3b7ffc243168f22da482377c16902320f0

[Po-Hsu Lin (cypressyew)]

The patch to suppress stress-ng warnings works as expected, thanks!