OOM Killer

linxbee · 01-27-2021, 09:41 PM

Sometimes on my target i see below error randomly

Code:

[ 8539.677000] syslog-ng invoked oom-killer: gfp_mask=0xd0, order=0, oom_adj=0, oom_score_adj=0
[ 8539.677000] syslog-ng cpuset=mjapp mems_allowed=0
[ 8539.678000] [ 2930]   102  2930     2893     1702   0       0             0 syslog-ng
[ 8539.678000] Memory cgroup out of memory: Kill process 2930 (syslog-ng) score 83 or sacrifice child
[ 8539.678000] Killed process 2930 (syslog-ng) total-vm:11572kB, anon-rss:6768kB, file-rss:40kB

Few things unclear to me here.

From the error it appears syslog-ng is getting killed because of Out Of Memory, but its not clear to me whether syslog-ng is requesting more memory or some other process requesting.

Also from line below:

Code:

[ 8539.677000] syslog-ng cpuset=mjapp mems_allowed=0

Does it mean "mjapp" is requesting for more memory?

Any other details i can use to find the real cause of OOM from the error?

Thanks in advance.

syg00 · 01-28-2021, 01:24 AM

OOM has a long and controversial history. Have a read of this for some background. Note the date - things have changed in the interim, but it remains like voodoo.
As for the cpuset, you can ignore it for this conversation - merely informational.