*** This bug is a duplicate of bug 1926808 ***
https://bugs.launchpad.net/bugs/1926808
All 4 patches were already applied via "Bionic update: upstream stable
patchset 2021-04-30" (bug #1926808):
e1e50ec65274 mm: memcontrol: fix NR_WRITEBACK leak in memcg and system stats
73b14d6718b0 mm:
Patches submitted: https://lists.ubuntu.com/archives/kernel-
team/2021-April/119661.html
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
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Andrew - thanks for the testing and results. I'll get these patches
submitted for review.
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https://bugs.launchpad.net/bugs/1926081
Title:
nr_writeback memory leak in kernel 4.15.0-137+
Installed and booted into the newly supplied kernel:
root@jenkins-lon02-02-general-swarm-node-03:~# dpkg -l | grep linux | grep 144
ii linux-image-unsigned-4.15.0-144-generic 4.15.0-144.148~LP1926081.2
amd64Linux kernel image for version 4.15.0 on 64 bit x86 SMP
ii
Tim,
I'll cordon off the machine we've been using again and run some tests
with this new kernel, hopefully I'll be able to do it today.
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https://bugs.launchpad.net/bugs/1926081
Title:
Andrew - It was suggested that there are a couple more patches relevant
to this issue:
mm: fix oom_kill event handling
mem_cgroup: make sure moving_account, move_lock_task and stat_cpu in the same
cacheline
mm: memcg: make sure memory.events is uptodate when waking pollers
mm: memcontrol: fix
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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Patches sent: https://lists.ubuntu.com/archives/kernel-
team/2021-April/119627.html
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https://bugs.launchpad.net/bugs/1926081
Title:
nr_writeback memory leak in kernel 4.15.0-137+
To
** Description changed:
+ SRU Justification
- Ubuntu 18.04.5 4.15.0 LTS kernels at version 4.15.0-137 and above contain a
memory leak due to the inclusion of patch from the upstream kernel, but not the
fix for that patch which was released later.
+ [Impact]
+
+ Ubuntu 18.04.5 4.15.0 LTS
Awesome, thank you!
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Title:
nr_writeback memory leak in kernel 4.15.0-137+
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Andrew - thanks for the testing feedback. We'll get these patches
included in the next SRU cycle.
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https://bugs.launchpad.net/bugs/1926081
Title:
nr_writeback memory leak in kernel
Good news on the custom -144 kernel you provided:
root@jenkins-lon02-02-general-swarm-node-03:~# uname -r
4.15.0-144-generic
root@jenkins-lon02-02-general-swarm-node-03:~# dpkg -l | grep 144
ii linux-image-unsigned-4.15.0-144-generic 4.15.0-144.148~LP1926081.1
amd64
Thank you both,
I'll give that kernel a go now.
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Title:
nr_writeback memory leak in kernel 4.15.0-137+
To manage notifications about this bug
That's awesome Andrew, thanks for being so proactive in the issue. For
your first LP bug report, you're doing an amazing job!
Tim posted above a kernel with both fixes, if you can try it, that'd be good.
And I want to apologize, I said a wrong information above - the fixes ARE in
linux-stable
Andrew - please find a test kernel at
https://kernel.ubuntu.com/~rtg/LP%231926081.
wget
https://kernel.ubuntu.com/~rtg/LP%231926081/amd64/linux-image-unsigned-4.15.0-144-generic_4.15.0-144.148~LP1926081.1_amd64.deb
wget
So, good news.
I pulled in the ubuntu kernel sources and applied the main patch I had
previously identified
(https://github.com/torvalds/linux/commit/c3cc39118c3610eb6ab4711bc624af7fc48a35fe).
Looking at the other patch
(https://github.com/torvalds/linux/commit/e27be240df53), that seems to
be
Guilherme, thank you for your kind words :)
I have been trying to reproduce this bug on several other systems that I
have access to in our cloud account, but I have been unable to reproduce
it on a VM (either with SAN or local SSD storage). The main set of
servers where this has been seen by us
apport information
** Tags added: apport-collected
** Description changed:
Ubuntu 18.04.5 4.15.0 LTS kernels at version 4.15.0-137 and above contain a
memory leak due to the inclusion of patch from the upstream kernel, but not the
fix for that patch which was released later.
This
Hi Andrew, thanks a lot for the very thorough bug report! This far
better than apport logs, you basically explained everything that is
going on plus what is need to fix it, much appreciated!
Based on upstream tree, I see the following 2 commits that carry Fixes
tag to the offender you pointed:
I did not initially run the `apport-collect` command as the servers on
which I observed this bug have been upgraded to use the 5.4.0 kernel to
mitigate the issue (as mentioned in the initial report), therefore the
kernel related information may be misleading.
I will endeavour to find a server
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