udev: by-path device names for NVMe disks are not persistent #22692
Description
systemd version the issue has been seen with
245.4-4ubuntu3.15
Used distribution
Ubuntu Server 20.04.4 LTS
Linux kernel version used (uname -a)
Linux oden 5.13.0-30-generic #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
CPU architecture issue was seen on
x86_64
Expected behaviour you didn't see
I expected the by-path device names to be persistent across reboots
Unexpected behaviour you saw
The by-path device names keeps changing when rebooting the machine
Steps to reproduce the problem
Plug in 10 x MZQL2960HCJR-00A07 SSDs in an AS-1114S-WN10RT server and repeatedly boot Ubuntu Server 20.04.4 LTS on it.
Additional program output to the terminal or log subsystem illustrating the issue
$ ls -1 /dev/disk/by-path/*part9
/dev/disk/by-path/pci-0000:03:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:04:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:43:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:44:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:81:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:82:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c1:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c2:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c3:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c4:00.0-nvme-1-part9
$
<reboot>
$ ls -1 /dev/disk/by-path/*part9
/dev/disk/by-path/pci-0000:01:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:02:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:41:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:42:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:81:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:82:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c1:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c2:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c3:00.0-nvme-1-part9
/dev/disk/by-path/pci-0000:c4:00.0-nvme-1-part9
$
Notice how the device names for four of the disks changed during reboot.