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 Linux kernel image for version 4.15.0 on 64 bit x86 SMP
ii linux-modules-4.15.0-144-generic 4.15.0-144.148~LP1926081.1
amd64 Linux kernel extra modules for version 4.15.0 on 64
bit x86 SMP
root@jenkins-lon02-02-general-swarm-node-03:~# uptime
08:53:37 up 48 min, 1 user, load average: 1.22, 3.54, 3.05
root@jenkins-lon02-02-general-swarm-node-03:~# grep "writeback" /proc/vmstat
nr_writeback 0
nr_writeback_temp 0
I've run through my testcase 3 times on this new kernel and I've not
seen any permanent increase in the `nr_writeback` value, it always
returns to zero, which is great.
So from my end, this looks really good - is there anything else you'd
like me to do or test, or is this good enough to pull them in for the
-144 update?
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https://bugs.launchpad.net/bugs/1926081
Title:
nr_writeback memory leak in kernel 4.15.0-137+
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