CentOS - Jul 2018 - upgrade 7.4 --> 7.5: dbus broken

Hi folks,

after upgrading a Centos container (LXC) from 7.4 to 7.5 I got
this:

# systemctl status
Failed to get D-Bus connection: Connection refused

# busctl
Failed to connect to bus: Connection refused

# ps -ef | grep db[u]s
dbus        55     1  0 Jul02 ?        00:00:00 /usr/bin/dbus-daemon --system
--address=systemd: --nofork --nopidfile --systemd-activation

# lsof -p 55
COMMAND   PID USER   FD      TYPE             DEVICE SIZE/OFF      NODE NAME
dbus-daem  55 dbus  cwd       DIR                8,4     4096    130819 /
dbus-daem  55 dbus  rtd       DIR                8,4     4096    130819 /
dbus-daem  55 dbus  txt       REG                8,4   223344    133569
/usr/bin/dbus-daemon
dbus-daem  55 dbus  DEL       REG                8,4             393485
/var/lib/sss/mc/initgroups
dbus-daem  55 dbus  mem       REG                8,4    37240    150982
/usr/lib64/libnss_sss.so.2
dbus-daem  55 dbus  mem       REG                8,4    62184    150786
/usr/lib64/libnss_files-2.17.so
dbus-daem  55 dbus  mem       REG                8,4    68192    141459
/usr/lib64/libbz2.so.1.0.6
dbus-daem  55 dbus  mem       REG                8,4    90664    140578
/usr/lib64/libz.so.1.2.7
dbus-daem  55 dbus  mem       REG                8,4    99944    150835
/usr/lib64/libelf-0.170.so
dbus-daem  55 dbus  mem       REG                8,4    19896    140110
/usr/lib64/libattr.so.1.1.0
dbus-daem  55 dbus  mem       REG                8,4   402384    132708
/usr/lib64/libpcre.so.1.2.0
dbus-daem  55 dbus  mem       REG                8,4    88776    150757
/usr/lib64/libgcc_s-4.8.5-20150702.so.1
dbus-daem  55 dbus  mem       REG                8,4    19776    150776
/usr/lib64/libdl-2.17.so
dbus-daem  55 dbus  mem       REG                8,4   297360    151443
/usr/lib64/libdw-0.170.so
dbus-daem  55 dbus  mem       REG                8,4   106848    150792
/usr/lib64/libresolv-2.17.so
dbus-daem  55 dbus  mem       REG                8,4    19384    141564
/usr/lib64/libgpg-error.so.0.10.0
dbus-daem  55 dbus  mem       REG                8,4   535064    141290
/usr/lib64/libgcrypt.so.11.8.2
dbus-daem  55 dbus  mem       REG                8,4    85952    150956
/usr/lib64/liblz4.so.1.7.5
dbus-daem  55 dbus  mem       REG                8,4   157424    140323
/usr/lib64/liblzma.so.5.2.2
dbus-daem  55 dbus  mem       REG                8,4    44448    150794
/usr/lib64/librt-2.17.so
dbus-daem  55 dbus  mem       REG                8,4  1139680    150778
/usr/lib64/libm-2.17.so
dbus-daem  55 dbus  mem       REG                8,4    20032    140130
/usr/lib64/libcap.so.2.22
dbus-daem  55 dbus  mem       REG                8,4  2173512    146385
/usr/lib64/libc-2.17.so
dbus-daem  55 dbus  mem       REG                8,4   144792    144798
/usr/lib64/libpthread-2.17.so
dbus-daem  55 dbus  mem       REG                8,4    23968    141464
/usr/lib64/libcap-ng.so.0.0.0
dbus-daem  55 dbus  mem       REG                8,4   127096    146315
/usr/lib64/libaudit.so.1.0.0
dbus-daem  55 dbus  mem       REG                8,4   155784    150814
/usr/lib64/libselinux.so.1
dbus-daem  55 dbus  mem       REG                8,4   173320    140201
/usr/lib64/libexpat.so.1.6.0
dbus-daem  55 dbus  mem       REG                8,4   203800    151456
/usr/lib64/libsystemd.so.0.6.0
dbus-daem  55 dbus  mem       REG                8,4   333408    144514
/usr/lib64/libdbus-1.so.3.14.14
dbus-daem  55 dbus  mem       REG                8,4   164240    150767
/usr/lib64/ld-2.17.so
dbus-daem  55 dbus    0u      CHR                1,3      0t0 129677343
/dev/null
dbus-daem  55 dbus    1u     unix 0xffff8f56b7b2cc00      0t0 129677608 socket
dbus-daem  55 dbus    2u     unix 0xffff8f56b7b2cc00      0t0 129677608 socket
dbus-daem  55 dbus    3u     unix 0xffff8f56bbbb3800      0t0 129676115
/run/dbus/system_bus_socket
dbus-daem  55 dbus    4u  a_inode               0,11        0      8547
[eventpoll]
dbus-daem  55 dbus    5r      REG                8,4 10406312    393485
/var/lib/sss/mc/initgroups (deleted)
dbus-daem  55 dbus    6u     sock                0,8      0t0 129677256
protocol: NETLINK
dbus-daem  55 dbus    7r  a_inode               0,11        0      8547 inotify
dbus-daem  55 dbus    8u     unix 0xffff8f56b80c4c00      0t0 129677257 socket
dbus-daem  55 dbus    9u     unix 0xffff8f56ba3aec00      0t0 129677258 socket
dbus-daem  55 dbus   10u     unix 0xffff8f56b7681000      0t0 129681025
/run/dbus/system_bus_socket

Please note the "/run/dbus/system_bus_socket". AFAICT thats new.
Shouldn't it listen
on /var/run/dbus/system_bus_socket for backward compatibility as well?


Is there is a way to fix this? Every helpful comment is highly appreciated.
Harri

On 07/03/2018 02:16 AM, Harald Dunkel wrote:
>
> Please note the "/run/dbus/system_bus_socket". AFAICT thats new. 
> Shouldn't it listen
> on /var/run/dbus/system_bus_socket for backward compatibility as well? 
Yes and no.

$ ls -ld /var/run
lrwxrwxrwx. 1 root root 6 Dec 13? 2017 /var/run -> ../run/

After a manual fix I have that, too. Point is that for historic
hosts this symlink doesn't exist. The upgrade fails due to dbus
becoming unavailable. And the next reboot fails, too, because
the symlink is not created automatically.

Can you confirm this?


Regards
Harri