On 01/26/2017 07:36 AM, Benjamin Roth wrote:
Hi there,
We installed 2 new nodes these days. They run on ubuntu (Ubuntu
16.04.1 LTS) with kernel 4.4.0-59-generic. On these nodes (and only on
these) CS gets killed by the kernel due to OOM. It seems very strange
to me because, CS only takes roughly 20GB (out of 128GB), most of RAM
is allocated to page cache.
Top looks typically like this:
KiB Mem : 13191691+total, 1974964 free, 20278184 used,
10966376+buff/cache
KiB Swap: 0 total, 0 free, 0 used. 11051503+avail Mem
This is what kern.log says:
https://gist.github.com/brstgt/0f1aa6afb558a56d1cadce958db46cf9
Has anyone encountered sth like this before?
2017-01-26T03:10:45.679458+00:00 cas10 kernel: [52226.449989] Node 0
Normal: 33850*4kB (UMEH) 8*8kB (UMH) 1*16kB (H) 0*32kB 0*64kB 0*128kB
0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 135480kB
2017-01-26T03:10:45.679460+00:00 cas10 kernel: [52226.449995] Node 1
Normal: 34213*4kB (UME) 176*8kB (UME) 0*16kB 0*32kB 0*64kB 0*128kB
0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 138260kB
There is plenty of free memory left (33850+34213)*4kB = 270 MB, but it
is fragmented into 4k and 8k blocks, while the kernel is trying to
allocate 16kB. Still, the kernel could have evicted some page cache or
swapped out anonymous memory. You should report this to lkml, it is a
kernel bug.
--
Benjamin Roth
Prokurist
Jaumo GmbH · www.jaumo.com <http://www.jaumo.com>
Wehrstraße 46 · 73035 Göppingen · Germany
Phone +49 7161 304880-6 · Fax +49 7161 304880-1
AG Ulm · HRB 731058 · Managing Director: Jens Kammerer
