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
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~LP1926081.2
amd64 Linux kernel extra modules for version 4.15.0 on 64
bit x86 SMP
root@jenkins-lon02-02-general-swarm-node-03:~# uname -r
4.15.0-144-generic
root@jenkins-lon02-02-general-swarm-node-03:~# uptime
08:06:22 up 19 min, 1 user, load average: 0.74, 0.31, 0.21
root@jenkins-lon02-02-general-swarm-node-03:~# ls -l /boot/
total 201933
-rw-r--r-- 1 root root 1537161 Jul 17 2018 abi-4.15.0-29-generic
-rw-r--r-- 1 root root 217414 Mar 24 12:47 config-4.15.0-141-generic
-rw-r--r-- 1 root root 217426 Apr 28 09:46 config-4.15.0-144-generic
-rw-r--r-- 1 root root 216807 Jul 17 2018 config-4.15.0-29-generic
-rw-r--r-- 1 root root 237757 Apr 12 17:02 config-5.4.0-72-generic
drwxr-xr-x 5 root root 1024 Apr 29 04:06 grub
-rw-r--r-- 1 root root 43066106 Apr 15 09:40 initrd.img-4.15.0-141-generic
-rw-r--r-- 1 root root 24589989 Apr 29 04:06 initrd.img-4.15.0-144-generic
-rw-r--r-- 1 root root 39975786 Apr 15 08:14 initrd.img-4.15.0-29-generic
-rw-r--r-- 1 root root 44490420 Apr 27 04:50 initrd.img-5.4.0-72-generic
drwx------ 2 root root 12288 Apr 15 07:55 lost+found
-rw-r--r-- 1 root root 0 Jul 17 2018 retpoline-4.15.0-29-generic
-rw------- 1 root root 4081420 Mar 24 12:47 System.map-4.15.0-141-generic
-rw------- 1 root root 4081469 Apr 28 09:46 System.map-4.15.0-144-generic
-rw------- 1 root root 4040379 Jul 17 2018 System.map-4.15.0-29-generic
-rw------- 1 root root 4585968 Apr 12 17:02 System.map-5.4.0-72-generic
-rw------- 1 root root 8445600 Mar 24 11:00 vmlinuz-4.15.0-141-generic
-rw------- 1 root root 8447776 Apr 28 09:46 vmlinuz-4.15.0-144-generic
-rw------- 1 root root 8257272 Jul 17 2018 vmlinuz-4.15.0-29-generic
-rw------- 1 root root 9445632 Apr 12 17:15 vmlinuz-5.4.0-72-generic
I've run my test through 5 times, and there has been no observed leak in
the writeback queue/memory used, so everything still looks good from my
side.
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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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