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SubjectRe: [RFC] Reproducible OOM with just a few sleeps
The issue is a regression with PAE, reproduced and verified on Ubuntu,
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 psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia


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