Device appeared twice with different sysfs paths

[tpmajer]

Hello,
I have seen this error message during system boot for about 2 days, and I couldn't find a solution. I tried to downgrade systemd to 228 and boot up Linux-lts (4.1.18-1), but it didn't help.
I have Windows 10 and Arch Linux (Dual Boot, UEFI, GRUB).

[tpmajer@archlinux ~]$ dmesg -l err
[   18.494168] systemd[1]: dev-disk-by\x2dpartlabel-Basic\x5cx20data\x5cx20partition.device: Dev dev-disk-by\x2dpartlabel-Basic\x5cx20data\x5cx20partition.device appeared twice with different sysfs paths /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/target4:0:0/4:0:0:0/block/sda/sda1 and /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/target4:0:0/4:0:0:0/block/sda/sda4

dmesg.txt

[tpmajer@archlinux ~]$ lsblk -f
NAME   FSTYPE LABEL        UUID                                 MOUNTPOINT
sda                                                             
├─sda1 ntfs   Recovery     EE2ACE172ACDDCA9                     
├─sda2 vfat                16D0-E2DB                            /boot/efi
├─sda3                                                          
├─sda4 ntfs   Windows10_OS 3EDCEF66DCEF1745                     
├─sda5 swap   Linux Swap   01aeffe8-b085-4b7a-bf00-02f9101fca9a [SWAP]
└─sda6 ext4   Arch Linux   616dab8d-710d-4853-8ca9-6845a0411e5e /
sr0

[tpmajer@archlinux ~]$ cat /etc/fstab
# UUID=616dab8d-710d-4853-8ca9-6845a0411e5e LABEL=Arch\134x20Linux
/dev/sda6               /           ext4        rw,relatime,data=ordered0 1

# UUID=16D0-E2DB
/dev/sda2               /boot/efi   vfat        rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro    0 2

# UUID=01aeffe8-b085-4b7a-bf00-02f9101fca9a LABEL=Linux\134x20Swap
/dev/sda5               none        swap        defaults    0 0

[tpmajer@archlinux ~]$ pacman -Q systemd
systemd 229-3
[tpmajer@archlinux ~]$ uname -a
Linux archlinux 4.4.2-1-ARCH #1 SMP PREEMPT Thu Feb 18 12:11:13 CET 2016 x86_64 GNU/Linux

My system boots up very slow.

[arvidjaar]

Two partitions have the same partition label; it has nothing to do with systemd and certainly not a systemd issue. The message is just a warning, as long as you do not use these links anyway it does not matter.

[poettering]

we should downgrade the message again I guess, to debug level.

Duplicate of #2677

[kobigi]

i see the same message in openstack deployment and suspect it causes ceph to fail during initialization.
is this indeed just a warning ?

[Steve-Newcomb]

I get these, uh, warning messages all the time, I assume because I use LUKS. Only the LUKS partitions generate the messages. I don't know why the system thinks the partition labels are duplicated, but maybe it's because the decrypted partitions are made to appear in /dev/mapper/... ? Anyway, they seem to work OK (modulo the annoying xhci_hcd reset messages that also don't seem to mean much of anything).