Kleber,
I finally had some time to narrow down what commit fixes this issue for
us today, below is the commit:
commit 7514c0362ffdd9af953ae94334018e7356b31313
Merge: 9322c47b21b9 428fc0aff4e5
Author: Linus Torvalds <torva...@linux-foundation.org>
Date: Sat Sep 5 13:28:40 2020 -0700
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"19 patches.
Subsystems affected by this patch series: MAINTAINERS, ipc, fork,
checkpatch, lib, and mm (memcg, slub, pagemap, madvise, migration,
hugetlb)"
* emailed patches from Andrew Morton <a...@linux-foundation.org>:
include/linux/log2.h: add missing () around n in roundup_pow_of_two()
mm/khugepaged.c: fix khugepaged's request size in collapse_file
mm/hugetlb: fix a race between hugetlb sysctl handlers
mm/hugetlb: try preferred node first when alloc gigantic page from cma
mm/migrate: preserve soft dirty in remove_migration_pte()
mm/migrate: remove unnecessary is_zone_device_page() check
mm/rmap: fixup copying of soft dirty and uffd ptes
mm/migrate: fixup setting UFFD_WP flag
mm: madvise: fix vma user-after-free
checkpatch: fix the usage of capture group ( ... )
fork: adjust sysctl_max_threads definition to match prototype
ipc: adjust proc_ipc_sem_dointvec definition to match prototype
mm: track page table modifications in __apply_to_page_range()
MAINTAINERS: IA64: mark Status as Odd Fixes only
MAINTAINERS: add LLVM maintainers
MAINTAINERS: update Cavium/Marvell entries
mm: slub: fix conversion of freelist_corrupted()
mm: memcg: fix memcg reclaim soft lockup
memcg: fix use-after-free in uncharge_batch
I also verified that the latest available Ubuntu 18.04 kernel as of
today (5.4.0-1054.57~18.04.1) still hits this memory leak issue for us.
Please let me know if you need any further information from us to
hopefully get this fix pulled into the supported Ubuntu 18.04 AWS
kernel.
Thanks,
Paul
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Packages, which is subscribed to linux-aws in Ubuntu.
https://bugs.launchpad.net/bugs/1925261
Title:
memory leak on AWS kernels when using docker
Status in linux-aws package in Ubuntu:
New
Status in linux-aws source package in Focal:
New
Bug description:
Ever since the "ubuntu-bionic-18.04-amd64-server-20200729" EC2 Ubuntu
AMI was released which has the "5.3.0-1032-aws" kernel we have been
hitting a 100% repro memory leak that causes our app that is running
under docker to be OOM killed.
The scenario is that we have an app running in a docker container and
it occasionally catches a crash happening within itself and when that
happens it creates another process which triggers a gdb dump of that
parent app. Normally this works fine but under these specific kernels
it causes the memory usage to grow and grow until it hits the maximum
allowed memory for the container at which point the container is
killed.
I have tested using several of the latest available Ubuntu AMIs
including the latest "ubuntu-bionic-18.04-amd64-server-20210415" which
has the "5.4.0-1045-aws" kernel and the bug still exists.
I also tested a bunch of the mainline kernels and found the fix was
introduced for this memory leak in the v5.9-rc4 kernel
(https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9-rc4/CHANGES).
Do you all have any idea if or when that set of changes will be
backported into a supported kernel for Ubuntu 18.04 or 20.04?
Release we are running:
root@<redacted>:~# lsb_release -rd
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Docker / containerd.io versions:
- containerd.io: 1.4.4-1
- docker-ce: 5:20.10.5~3-0~ubuntu-bionic
Latest supported kernel I tried which still sees the memory leak:
root@hostname:~# apt-cache policy linux-aws
linux-aws:
Installed: 5.4.0.1045.27
Candidate: 5.4.0.1045.27
Version table:
*** 5.4.0.1045.27 500
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu
bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
4.15.0.1007.7 500
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu bionic/main amd64
Packages
Thanks,
Paul
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