** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => Fix Committed
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1662378
Title:
many OOMs on busy xenial IMAP server with lots of available memory
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Bug description:
We recently noticed that a busy xenial IMAP server with about 22 days
uptime has been logging a lot of OOM messages. The machine has 24G of
memory. Below please find some typical memory info.
I noted that there was about 11G of memory allocated to slab, and
since all of the oom-killer invoked messages report order=2 or order=3
(see below for gfp_flags) I thought that maybe fragmentation was a
factor. After doing echo 2 > /proc/sys/vm/drop_caches to release
reclaimable slab memory, no OOMs were logged for around 30 minutes,
but then they started up again, although perhaps not as frequently as
before, and the amount of memory in slab was back up around its former
size. To the best of my knowledge we do not have any custom VM-
related sysctl tweaks on this machine.
Attached please find version.log and lspci-vnvn.log. And here's a link to a
kern.log from a little before time of boot onwards, containing all of the
oom-killer messages:
https://people.canonical.com/~pjdc/grenadilla-sanitized-kern.log.xz
== Breakdown of Failed Allocations ===
pjdc@grenadilla:~$ grep -o 'gfp_mask=.*, order=.'
kern.log-version-with-oom-killer-invoked | sort | uniq -c | sort -n
1990 gfp_mask=0x26000c0, order=2
4043 gfp_mask=0x240c0c0, order=3
pjdc@grenadilla:~$ _
== Representative (Probably) Memory Info ==
pjdc@grenadilla:~$ free -m
total used free shared buff/cache
available
Mem: 24097 1762 213 266 22121
21087
Swap: 17492 101 17391
pjdc@grenadilla:~$ cat /proc/meminfo
MemTotal: 24676320 kB
MemFree: 219440 kB
MemAvailable: 21593416 kB
Buffers: 6186648 kB
Cached: 4255608 kB
SwapCached: 3732 kB
Active: 7593140 kB
Inactive: 4404824 kB
Active(anon): 1319736 kB
Inactive(anon): 508544 kB
Active(file): 6273404 kB
Inactive(file): 3896280 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 17912436 kB
SwapFree: 17808972 kB
Dirty: 524 kB
Writeback: 0 kB
AnonPages: 1553244 kB
Mapped: 219868 kB
Shmem: 272576 kB
Slab: 12209796 kB
SReclaimable: 11572836 kB
SUnreclaim: 636960 kB
KernelStack: 14464 kB
PageTables: 54864 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 30250596 kB
Committed_AS: 2640808 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 18432 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 2371708 kB
DirectMap2M: 22784000 kB
pjdc@grenadilla:~$
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