** Tags added: trusty
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https://bugs.launchpad.net/bugs/1098961
Title:
PAE regression: OOM with just a few sleeps
Status in “linux” package in Ubuntu:
Expired
Bug description:
There is a spurious OOM issue with PAE kernel: it will suffer an OOM
crash just by running a few processes.
Please see also
http://bugs.debian.org/695182
and discussion on linux...@kvack.org e.g.
http://marc.info/?l=linux-mm&m=135801969519193&w=2
I wonder whether
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098342
is related.
The issue is a regression with PAE, reproduced and verified on my
home PC with 3GB RAM.
My PC was running kernel linux-image-3.2.0-35-generic so it showed:
psz@DellE520:~$ uname -a
Linux DellE520 3.2.0-35-generic #55-Ubuntu SMP Wed Dec 5 17:45:18 UTC 2012
i686 i686 i386 GNU/Linux
psz@DellE520:~$ free -l
total used free shared buffers cached
Mem: 3087972 692256 2395716 0 18276 427116
Low: 861464 71372 790092
High: 2226508 620884 1605624
-/+ buffers/cache: 246864 2841108
Swap: 20000920 258364 19742556
Then it handled the "sleep test"
bash -c 'n=0; while [ $n -lt 33000 ]; do sleep 600 & ((n=n+1));
((m=n%500)); if [ $m -lt 1 ]; then echo -n "$n - "; date; free -l; sleep 1; fi;
done'
just fine, stopped only by "max user processes" (default setting of
"ulimit -u 23964"), or raising that limit stopped when the machine ran
out of PID space; there was no OOM.
Installing and running the PAE kernel so it showed:
psz@DellE520:~$ uname -a
Linux DellE520 3.2.0-35-generic-pae #55-Ubuntu SMP Wed Dec 5 18:04:39 UTC
2012 i686 i686 i386 GNU/Linux
psz@DellE520:~$ free -l
total used free shared buffers cached
Mem: 3087620 681188 2406432 0 167332 352296
Low: 865208 214080 651128
High: 2222412 467108 1755304
-/+ buffers/cache: 161560 2926060
Swap: 20000920 0 20000920
and re-trying the "sleep test", it ran into OOM after 18000 or so sleeps
and crashed/froze so I had to press the POWER button to recover.
Cheers, Paul
Paul Szabo p...@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu15.1
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: psz 2190 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xdfddc000 irq 45'
Mixer name : 'SigmaTel STAC9227'
Components : 'HDA:83847618,102801dd,00100201'
Controls : 38
Simple ctrls : 21
CurrentDmesg: [ 28.160013] eth0: no IPv6 routers present
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=9d2bf7ac-9b0a-4082-ac45-f4d3c8e32c23
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: Dell Inc. Dell DM061
MarkForUpload: True
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=C
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: root=/dev/mapper/isw_cheedcedhh_DadMirroredTB4 ro quiet
splash
ProcVersionSignature: Ubuntu 3.2.0-35.55-generic-pae 3.2.34
RelatedPackageVersions:
linux-restricted-modules-3.2.0-35-generic-pae N/A
linux-backports-modules-3.2.0-35-generic-pae N/A
linux-firmware 1.79.1
RfKill:
Tags: precise
Uname: Linux 3.2.0-35-generic-pae i686
UpgradeStatus: Upgraded to precise on 2012-04-27 (260 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
WifiSyslog: Jan 13 06:42:46 DellE520 NetworkManager[1384]: <info> Unmanaged
Device found; state CONNECTED forced. (see
http://bugs.launchpad.net/bugs/191889)
WpaSupplicantLog:
dmi.bios.date: 03/23/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.2.1
dmi.board.name: 0WG864
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.2.1:bd03/23/2007:svnDellInc.:pnDellDM061:pvr:rvnDellInc.:rn0WG864:rvr:cvnDellInc.:ct6:cvr:
dmi.product.name: Dell DM061
dmi.sys.vendor: Dell Inc.
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