CentOS 7 - Big size Slab

[AndreyNovik1993]

Hi, all. I am having problem with memory on one server, and I am don't understanding how is fixed ?
It's file /proc/meminfo
MemTotal: 24592560 kB
MemFree: 532324 kB
Buffers: 236832 kB
Cached: 459252 kB
SwapCached: 60448 kB
Active: 7312736 kB
Inactive: 1607264 kB
Active(anon): 6851356 kB
Inactive(anon): 1372752 kB
Active(file): 461380 kB
Inactive(file): 234512 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2097148 kB
SwapFree: 1424980 kB
Dirty: 136 kB
Writeback: 24 kB
AnonPages: 8199460 kB
Mapped: 69492 kB
Shmem: 192 kB
Slab: 14876100 kB
SReclaimable: 14810428 kB
SUnreclaim: 65672 kB
KernelStack: 23496 kB
PageTables: 38716 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 14393428 kB
Committed_AS: 8999040 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 213232 kB
VmallocChunk: 34359392960 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2250752 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 10240 kB
DirectMap2M: 25155584 kB

I seeing what slab used 14 GB memory, it's not normal.
I have second node, but them slab's having size 1.6Gb.
Maybe something now, why can slab have big size ?

[jcberthon]

Hi @AndreyNovik1993

I have the same issue on CentOS 7, I have reported it to Red Hat: https://bugzilla.redhat.com/show_bug.cgi?id=1632152

On the host we are running KVM guests and Docker containers, nothing else.

We recently have no longer the problem, for unknown reason. Check the issue to have more information.