Here's the Zesty test; all looks good.

ubuntu@ubuntu:~$ cat /etc/cloud/build.info
build_name: server
serial: 20171207
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.10.0-40-generic #44~lp1729145 SMP Wed Dec 6 16:21:45 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ tree /dev/bcache
/dev/bcache [error opening dir]

0 directories, 0 files

$ sudo dpkg --install
linux-image-4.10.0-40-generic_4.10.0-40.44~lp1729145_amd64.deb
dpkg: warning: downgrading linux-image-4.10.0-40-generic from 4.10.0-40.44
to 4.10.0-40.44~lp1729145
(Reading database ... 56846 files and directories currently installed.)
Preparing to unpack
linux-image-4.10.0-40-generic_4.10.0-40.44~lp1729145_amd64.deb ...
Done.
Unpacking linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) over
(4.10.0-40.44) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.10.0-40-generic
/boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postrm.d/x-grub-legacy-ec2
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.10.0-40-generic
/boot/vmlinuz-4.10.0-40-generic
Setting up linux-image-4.10.0-40-generic (4.10.0-40.44~lp1729145) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Not updating initrd symbolic links since we are being updated/reinstalled
(4.10.0-40.44 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled
(4.10.0-40.44 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
update-initramfs: Generating /boot/initrd.img-4.10.0-40-generic
W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-4.10.0-40-generic
Found kernel: /boot/vmlinuz-4.10.0-40-generic
Updating /boot/grub/menu.lst ... done

run-parts: executing /etc/kernel/postinst.d/zz-update-grub
4.10.0-40-generic /boot/vmlinuz-4.10.0-40-generic
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.10.0-40-generic
Found initrd image: /boot/initrd.img-4.10.0-40-generic
done
ubuntu@ubuntu:~$ sudo reboot
...

ubuntu@ubuntu:~$ dpkg --list | grep linux-image
ii  linux-image-4.10.0-40-generic              4.10.0-40.44~lp1729145
                 amd64        Linux kernel image for version 4.10.0 on 64
bit x86 SMP
ii  linux-image-virtual                        4.10.0.40.40
                 amd64        Virtual Linux kernel image
ubuntu@ubuntu:~$ sudo tree /dev/bcache
/dev/bcache
├── by-label
│   ├── backing0 -> ../../bcache2
│   └── backing1 -> ../../bcache0
└── by-uuid
    ├── 1375d23f-4780-46d7-9fca-c397f8333685 -> ../../bcache3
    ├── 57e009b1-6bf4-42ea-abe0-334b10941a0b -> ../../bcache0
    ├── 7ce7dc32-7da9-42a8-899a-5d21ed7ea714 -> ../../bcache1
    └── 92d882d8-38cd-4537-847b-6f9c40ba67b4 -> ../../bcache2

2 directories, 6 files


On Wed, Dec 6, 2017 at 11:00 AM, Joseph Salisbury <
<email address hidden>> wrote:

> I built Xenial, Zesty and Bionic test kernels with your patch.  They can
> also be downloaded from:
>
> http://kernel.ubuntu.com/~jsalisbury/lp1729145/
>
> Can those that can reproduce this bug give this test kernel a try?
>
>
> Zesty required upstream commit 4b758df21 as a prereq.  Zesty never got it,
> since upstream 4.10 is EOL.  Zesty would be the more important test kernel
> to try due to this difference.
>
> Thanks again.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
>   /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1729145/+subscriptions
>