Ok, so a little bit further. This seems to be that stress-ng is
triggering OOMkiller which I'm not sure it should be, unless it's just
really writing a LOT of data to memory.
My setup has been the same on all architectures and I've seen the same
behaviour on Artful deployments on amd64 (Xeon Phi), Power8 and s390x:
created swap space that is 2x the amount of RAM per the output of free
ran the stress-ng based memory stress test from the certification suite
stress-ng tells us that the tests all pass
dmesg reveals invocations of OOMKiller
This is all handled by the memory_stress_ng script in the cert suite.
The tests we run are defined by this block:
crt_stressors=("bsearch" "context" "hsearch" "lsearch" "matrix" \
"memcpy" "null" "pipe" "qsort" "stack" "str" "stream" \
"tsearch" "vm-rw" "wcs" "zero" "mlock" "mmapfork" "mmapmany" \
"mremap" "shm-sysv" "vm-splice")
if [ "$numa_nodes" -gt 1 ]; then
crt_stressors+=("numa")
fi
and we run them individually, one test case at a time.
I've attached a tarball with the stderr and stdout from stress-ng, dmesg
contents and the test script that runs all this.
** Attachment added: "s390x-memory-oomkiller.tgz"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729878/+attachment/5006068/+files/s390x-memory-oomkiller.tgz
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https://bugs.launchpad.net/bugs/1729878
Title:
stress-ng triggering call-traces on s390x z/VM instances
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Artful:
Confirmed
Bug description:
During regression testing on a z/VM instance, I noticed call traces
being dumped to dmesg that seem to be related to stress-ng.
The stress-ng invocation we're using is:
stress-ng --aggressive --verify --timeout $runtime \
--metrics-brief --tz --times \
--af-alg 0 --bsearch 0 --context 0 --cpu 0 \
--crypt 0 --hsearch 0 --longjmp 0 --lsearch
0 \
--matrix 0 --qsort 0 --str 0 --stream 0 \
--tsearch 0 --vecmath 0 --wcs 0
as executed by the cpu_stress script from the cpu/cpu_stress_ng test
in the certification suite.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-16-generic 4.13.0-16.19
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic s390x
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: 2.20.7-0ubuntu3.1
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.
Date: Fri Nov 3 11:12:04 2017
HibernationDevice: RESUME=UUID=1ce0f037-449a-43a1-af49-e730f6f99ac4
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C
SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=/dev/mapper/hwe0008_vg-lv crashkernel=196M
BOOT_IMAGE=0
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware 1.169
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2017-11-02 (0 days ago)
---
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
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
DistroRelease: Ubuntu 17.10
HibernationDevice: RESUME=UUID=1ce0f037-449a-43a1-af49-e730f6f99ac4
IwConfig: Error: [Errno 2] No such file or directory
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C
SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=/dev/mapper/hwe0008_vg-lv crashkernel=196M
BOOT_IMAGE=0
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware 1.169
RfKill: Error: [Errno 2] No such file or directory
Tags: artful
Uname: Linux 4.13.0-16-generic s390x
UpgradeStatus: Upgraded to artful on 2017-11-02 (0 days ago)
UserGroups: adm cdrom cpacfstats dip lpadmin lxd plugdev sambashare sudo
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