Yast Nework Setting hangs during Initializing Network Configuration

**fosdex** · 06-Oct-2020, 16:50

Originally Posted by hcvv

It seems that you think this is something everybody experiences. I am not so sure. AFAIK you are the first to report this. And I can not believe that nobody uses YaST > Netwok Settings. I am still on 15.1, thus I can not testify,.

I too did not observe this issue on 15.1. Doing a web search I did fine similar reports in 13.1 but no resolution.

**fosdex** · 06-Oct-2020, 17:23

Originally Posted by malcolmlewis

Hi
Just tested here GNOME/Xorg, all good switching between the two via YaST (openSUSE Leap 15.2 qemu). Could be a Wayland issue, the system is all up to date? What graphics card?

Wayland? Yes, it is definitely not ready for prime time so that is certainly possible.

System is totally up to date and a very ordinary desktop system installation, nothing extraneous installed and nothing outside the Leap 15.2 ecosystem

Graphics is AMD RX550.

Except for the observed anomally the system works fine. I only noticed the hang in Yast Network Settings because I knew I could change the setting of interest there quickly (read lazy). Seeing the anomalous behaviour is why I have inquired about it. If it has been observed and has a fix then good. If it seems worth a bug report then ok. If it's just me...no big deal as it has no functional affect on the system that I can see so far unless I switch to wicked.

enjoy...

**tsu2** · 06-Oct-2020, 18:55

Recommend collecting more information.

You can view your system logs in real time by first opening a console running the folllowing command and leaving it open before you do whateveryou observe is having a problem. If anything is written to the system log, you will see it

Code:

journalctl -f

The other thing you might do is run top in another console and observe if anything that's noticeable changes... Maybe a process will be busy, maybe there will be a change in busy processes.

I agree, it shouldn't take more than a minute at most for devices to be detected.

TSU

**fosdex** · 07-Oct-2020, 14:08

Originally Posted by tsu2

Recommend collecting more information.

The content of the system log was posted in my initial post. Nothing in the log appears relavant to the hang issue.

Ah yes, lets do some debugging...

Start Yast from the GUI and let's look at the process tree. As would be expected Yast is running.

Code:

 
user:~/debug> pstree 
 
systemd-+-ModemManager---2*[{ModemManager}] 
        |-NetworkManager---2*[{NetworkManager}] 
        |-accounts-daemon---2*[{accounts-daemon}] 
        |-agetty 
        |-auditd---{auditd} 
        |-avahi-daemon 
        |-chronyd 
        |-colord---2*[{colord}] 
        |-cron 
        |-cupsd 
        |-dbus-daemon 
        |-firewalld---{firewalld} 
        |-fwupd---4*[{fwupd}] 
        |-gdm-+-gdm-session-wor-+-gdm-wayland-ses-+-gnome-session-b---3*[{gnome-session-b}] 
        |     |                 |                 `-2*[{gdm-wayland-ses}] 
        |     |                 `-2*[{gdm-session-wor}] 
        |     `-2*[{gdm}] 
        |-gnome-keyring-d---3*[{gnome-keyring-d}] 
        |-haveged 
        |-irqbalance---{irqbalance} 
        |-master-+-pickup 
        |        `-qmgr 
        |-mcelog 
        |-nscd---10*[{nscd}] 
        |-polkitd---7*[{polkitd}] 
        |-rsyslogd---4*[{rsyslogd}] 
        |-rtkit-daemon---2*[{rtkit-daemon}] 
        |-smartd 
        |-systemd-+-(sd-pam) 
        |         |-at-spi-bus-laun-+-dbus-daemon 
        |         |                 `-3*[{at-spi-bus-laun}] 
        |         |-at-spi2-registr---2*[{at-spi2-registr}] 
        |         |-2*[dbus-daemon] 
        |         |-dbus-launch 
        |         |-dconf-service---2*[{dconf-service}] 
        |         |-evolution-addre---5*[{evolution-addre}] 
        |         |-evolution-calen---8*[{evolution-calen}] 
        |         |-evolution-sourc---3*[{evolution-sourc}] 
        |         |-gnome-session-b-+-evolution-alarm---5*[{evolution-alarm}] 
        |         |                 |-gnome-software---3*[{gnome-software}] 
        |         |                 |-gnome-tweak-too---2*[{gnome-tweak-too}] 
        |         |                 |-gsd-disk-utilit---2*[{gsd-disk-utilit}] 
        |         |                 |-tracker-miner-f---4*[{tracker-miner-f}] 
        |         |                 `-3*[{gnome-session-b}] 
        |         |-gnome-session-c---{gnome-session-c} 
        |         |-gnome-shell-+-Xwayland---19*[{Xwayland}] 
        |         |             |-xdg-su---gnomesu-+-gnomesu-pam-bac---yast2---y2controlcenter---12*[{y2controlcenter}] 
        |         |             |                  `-3*[{gnomesu}] 
        |         |             `-19*[{gnome-shell}] 
        |         |-gnome-shell-cal---5*[{gnome-shell-cal}] 
        |         |-gnome-terminal--+-bash---pstree 
        |         |                 `-3*[{gnome-terminal-}] 
        |         |-goa-daemon---3*[{goa-daemon}] 
        |         |-goa-identity-se---2*[{goa-identity-se}] 
        |         |-gsd-a11y-settin---3*[{gsd-a11y-settin}] 
        |         |-gsd-color---3*[{gsd-color}] 
        |         |-gsd-datetime---3*[{gsd-datetime}] 
        |         |-gsd-housekeepin---3*[{gsd-housekeepin}] 
        |         |-gsd-keyboard---3*[{gsd-keyboard}] 
        |         |-gsd-media-keys---3*[{gsd-media-keys}] 
        |         |-gsd-power---3*[{gsd-power}] 
        |         |-gsd-print-notif---2*[{gsd-print-notif}] 
        |         |-gsd-printer---2*[{gsd-printer}] 
        |         |-gsd-rfkill---2*[{gsd-rfkill}] 
        |         |-gsd-screensaver---2*[{gsd-screensaver}] 
        |         |-gsd-sharing---3*[{gsd-sharing}] 
        |         |-gsd-smartcard---4*[{gsd-smartcard}] 
        |         |-gsd-sound---3*[{gsd-sound}] 
        |         |-gsd-wacom---3*[{gsd-wacom}] 
        |         |-gsd-wwan---3*[{gsd-wwan}] 
        |         |-gsd-xsettings---13*[{gsd-xsettings}] 
        |         |-gvfs-afc-volume---3*[{gvfs-afc-volume}] 
        |         |-gvfs-goa-volume---2*[{gvfs-goa-volume}] 
        |         |-gvfs-gphoto2-vo---2*[{gvfs-gphoto2-vo}] 
        |         |-gvfs-mtp-volume---2*[{gvfs-mtp-volume}] 
        |         |-gvfs-udisks2-vo---3*[{gvfs-udisks2-vo}] 
        |         |-gvfsd-+-gvfsd-burn---2*[{gvfsd-burn}] 
        |         |       |-gvfsd-trash---2*[{gvfsd-trash}] 
        |         |       `-2*[{gvfsd}] 
        |         |-gvfsd-fuse---5*[{gvfsd-fuse}] 
        |         |-gvfsd-metadata---2*[{gvfsd-metadata}] 
        |         |-mission-control---3*[{mission-control}] 
        |         |-pulseaudio-+-gsettings-helpe---3*[{gsettings-helpe}] 
        |         |            `-{pulseaudio} 
        |         `-xdg-permission----2*[{xdg-permission-}] 
        |-systemd-journal 
        |-systemd-logind 
        |-systemd-timesyn---{systemd-timesyn} 
        |-systemd-udevd 
        |-udisksd---4*[{udisksd}] 
        |-upowerd---2*[{upowerd}] 
        `-wpa_supplicant

Start Network Settings (Yast -> System -> Network Settings) initiates the process y2start.

Code:

 
user:~/debug> pstree 
 
systemd-+-ModemManager---2*[{ModemManager}] 
        |-NetworkManager---2*[{NetworkManager}] 
        |-accounts-daemon---2*[{accounts-daemon}] 
        |-agetty 
        |-auditd---{auditd} 
        |-avahi-daemon 
        |-chronyd 
        |-colord---2*[{colord}] 
        |-cron 
        |-cupsd 
        |-dbus-daemon 
        |-firewalld---{firewalld} 
        |-fwupd---4*[{fwupd}] 
        |-gdm-+-gdm-session-wor-+-gdm-wayland-ses-+-gnome-session-b---3*[{gnome-session-b}] 
        |     |                 |                 `-2*[{gdm-wayland-ses}] 
        |     |                 `-2*[{gdm-session-wor}] 
        |     `-2*[{gdm}] 
        |-gnome-keyring-d---3*[{gnome-keyring-d}] 
        |-haveged 
        |-irqbalance---{irqbalance} 
        |-master-+-pickup 
        |        `-qmgr 
        |-mcelog 
        |-nscd---10*[{nscd}] 
        |-polkitd---7*[{polkitd}] 
        |-rsyslogd---4*[{rsyslogd}] 
        |-rtkit-daemon---2*[{rtkit-daemon}] 
        |-smartd 
        |-systemd-+-(sd-pam) 
        |         |-at-spi-bus-laun-+-dbus-daemon 
        |         |                 `-3*[{at-spi-bus-laun}] 
        |         |-at-spi2-registr---2*[{at-spi2-registr}] 
        |         |-2*[dbus-daemon] 
        |         |-dbus-launch 
        |         |-dconf-service---2*[{dconf-service}] 
        |         |-evolution-addre---5*[{evolution-addre}] 
        |         |-evolution-calen---8*[{evolution-calen}] 
        |         |-evolution-sourc---3*[{evolution-sourc}] 
        |         |-gnome-session-b-+-evolution-alarm---5*[{evolution-alarm}] 
        |         |                 |-gnome-software---3*[{gnome-software}] 
        |         |                 |-gnome-tweak-too---2*[{gnome-tweak-too}] 
        |         |                 |-gsd-disk-utilit---2*[{gsd-disk-utilit}] 
        |         |                 |-tracker-miner-f---4*[{tracker-miner-f}] 
        |         |                 `-3*[{gnome-session-b}] 
        |         |-gnome-session-c---{gnome-session-c} 
        |         |-gnome-shell-+-Xwayland---19*[{Xwayland}] 
        |         |             |-xdg-su---gnomesu-+-gnomesu-pam-bac---yast2---y2controlcenter---12*[{y2controlcenter}] 
        |         |             |                  `-3*[{gnomesu}] 
        |         |             `-20*[{gnome-shell}] 
        |         |-gnome-shell-cal---5*[{gnome-shell-cal}] 
        |         |-gnome-terminal--+-bash---pstree 
        |         |                 `-3*[{gnome-terminal-}] 
        |         |-goa-daemon---3*[{goa-daemon}] 
        |         |-goa-identity-se---2*[{goa-identity-se}] 
        |         |-gsd-a11y-settin---3*[{gsd-a11y-settin}] 
        |         |-gsd-color---3*[{gsd-color}] 
        |         |-gsd-datetime---3*[{gsd-datetime}] 
        |         |-gsd-housekeepin---3*[{gsd-housekeepin}] 
        |         |-gsd-keyboard---3*[{gsd-keyboard}] 
        |         |-gsd-media-keys---3*[{gsd-media-keys}] 
        |         |-gsd-power---3*[{gsd-power}] 
        |         |-gsd-print-notif---2*[{gsd-print-notif}] 
        |         |-gsd-printer---2*[{gsd-printer}] 
        |         |-gsd-rfkill---2*[{gsd-rfkill}] 
        |         |-gsd-screensaver---2*[{gsd-screensaver}] 
        |         |-gsd-sharing---3*[{gsd-sharing}] 
        |         |-gsd-smartcard---4*[{gsd-smartcard}] 
        |         |-gsd-sound---3*[{gsd-sound}] 
        |         |-gsd-wacom---3*[{gsd-wacom}] 
        |         |-gsd-wwan---3*[{gsd-wwan}] 
        |         |-gsd-xsettings---13*[{gsd-xsettings}] 
        |         |-gvfs-afc-volume---3*[{gvfs-afc-volume}] 
        |         |-gvfs-goa-volume---2*[{gvfs-goa-volume}] 
        |         |-gvfs-gphoto2-vo---2*[{gvfs-gphoto2-vo}] 
        |         |-gvfs-mtp-volume---2*[{gvfs-mtp-volume}] 
        |         |-gvfs-udisks2-vo---3*[{gvfs-udisks2-vo}] 
        |         |-gvfsd-+-gvfsd-burn---2*[{gvfsd-burn}] 
        |         |       |-gvfsd-trash---2*[{gvfsd-trash}] 
        |         |       `-2*[{gvfsd}] 
        |         |-gvfsd-fuse---5*[{gvfsd-fuse}] 
        |         |-gvfsd-metadata---2*[{gvfsd-metadata}] 
        |         |-mission-control---3*[{mission-control}] 
        |         |-pulseaudio-+-gsettings-helpe---3*[{gsettings-helpe}] 
        |         |            `-{pulseaudio} 
        |         |-xdg-permission----2*[{xdg-permission-}] 
        |         `-yast2---y2start---14*[{y2start}] 
        |-systemd-journal 
        |-systemd-logind 
        |-systemd-timesyn---{systemd-timesyn} 
        |-systemd-udevd 
        |-udisksd---4*[{udisksd}] 
        |-upowerd---2*[{upowerd}] 
        `-wpa_supplicant

At this point the Network Settings is now hung at the "Initializing Network Configuration" screen at "Read device configuration" and is non-responsive. The process y2start is running so lets take a look.

Code:

 
user:~/debug> top 
 
top - 15:06:12 up 5 min,  2 users,  load average: 0.62, 0.66, 0.37 
Tasks: 236 total,   2 running, 234 sleeping,   0 stopped,   0 zombie 
%Cpu(s): 25.4 us,  0.1 sy,  0.0 ni, 74.2 id,  0.3 wa,  0.0 hi,  0.0 si,  0.0 st 
MiB Mem : 14994.47+total, 13418.41+free,  881.703 used,  694.352 buff/cache 
MiB Swap: 23999.99+total, 23999.99+free,    0.000 used. 13821.04+avail Mem  
 
  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND     
 3028 root      20   0 1755132 203412 101636 R 100.0 1.325   0:30.89 y2start     
 2264 cosmic    20   0 4139172 217676 118508 S 0.997 1.418   0:12.45 gnome-she+  
 2858 cosmic    20   0  547992  50388  40332 S 0.332 0.328   0:01.37 gnome-ter+  
    1 root      20   0  221176  10084   7016 S 0.000 0.066   0:09.33 systemd     
    2 root      20   0       0      0      0 S 0.000 0.000   0:00.00 kthreadd    
    3 root       0 -20       0      0      0 I 0.000 0.000   0:00.00 rcu_gp      
    4 root       0 -20       0      0      0 I 0.000 0.000   0:00.00 rcu_par_gp  
    6 root       0 -20       0      0      0 I 0.000 0.000   0:00.00 kworker/0+  
    7 root      20   0       0      0      0 I 0.000 0.000   0:00.01 kworker/u+  
    8 root       0 -20       0      0      0 I 0.000 0.000   0:00.00 mm_percpu+  
    9 root      20   0       0      0      0 S 0.000 0.000   0:00.02 ksoftirqd+  
   10 root      20   0       0      0      0 I 0.000 0.000   0:00.11 rcu_sched   
   11 root      rt   0       0      0      0 S 0.000 0.000   0:00.00 migration+  
   12 root     -51   0       0      0      0 S 0.000 0.000   0:00.00 idle_inje+  
   13 root      20   0       0      0      0 I 0.000 0.000   0:00.03 kworker/0+  
   14 root      20   0       0      0      0 S 0.000 0.000   0:00.00 cpuhp/0     
   15 root      20   0       0      0      0 S 0.000 0.000   0:00.00 cpuhp/1

The process y2start is running with 100% CPU utilization. Not good, so let's snoop what it is doing.

Code:

 
user:~/debug> sudo strace -r -p 3028 
strace: Process 3028 attached 
     0.000000 brk(0x5569ec637000)       = 0x5569ec637000 
    21.768048 brk(0x5569ec658000)       = 0x5569ec658000 
    21.675483 brk(0x5569ec679000)       = 0x5569ec679000 
    21.615739 brk(0x5569ec69a000)       = 0x5569ec69a000 
    21.628528 brk(0x5569ec6bb000)       = 0x5569ec6bb000 
    19.241669 brk(0x5569ec6e0000)       = 0x5569ec6e0000 
     0.001210 brk(0x5569ec704000)       = 0x5569ec704000 
     0.001154 brk(0x5569ec728000)       = 0x5569ec728000 
     0.000179 brk(0x5569ec749000)       = 0x5569ec749000 
     0.001547 brk(0x5569ec76c000)       = 0x5569ec76c000 
     0.001185 brk(0x5569ec790000)       = 0x5569ec790000 
     0.001181 brk(0x5569ec7b4000)       = 0x5569ec7b4000 
     0.001190 brk(0x5569ec7d8000)       = 0x5569ec7d8000 
     0.001187 brk(0x5569ec7fc000)       = 0x5569ec7fc000 
     0.000941 brk(0x5569ec846000)       = 0x5569ec846000 
     0.001957 brk(0x5569ec868000)       = 0x5569ec868000 
     0.001192 brk(0x5569ec88c000)       = 0x5569ec88c000 
     0.001191 brk(0x5569ec8b0000)       = 0x5569ec8b0000 
     0.001169 brk(0x5569ec8d4000)       = 0x5569ec8d4000 
     0.001179 brk(0x5569ec8f8000)       = 0x5569ec8f8000 
     0.001188 brk(0x5569ec91c000)       = 0x5569ec91c000 
     0.001189 brk(0x5569ec940000)       = 0x5569ec940000 
     0.009084 brk(0x5569ec99a000)       = 0x5569ec99a000 
     0.015690 brk(0x5569eca09000)       = 0x5569eca09000 
     0.049572 brk(0x5569eca47000)       = 0x5569eca47000 
     0.002079 brk(0x5569ecae7000)       = 0x5569ecae7000 
     0.007581 brk(0x5569ecb87000)       = 0x5569ecb87000 
     0.003878 brk(0x5569ecc77000)       = 0x5569ecc77000 
     0.008849 brk(0x5569eccb9000)       = 0x5569eccb9000 
   428.647183 brk(0x5569eccda000)       = 0x5569eccda000 
    21.469835 brk(0x5569eccfb000)       = 0x5569eccfb000 
    21.475396 brk(0x5569ecd1c000)       = 0x5569ecd1c000 
    21.470280 brk(0x5569ecd3d000)       = 0x5569ecd3d000 
    21.468734 brk(0x5569ecd5e000)       = 0x5569ecd5e000 
    21.479867 brk(0x5569ecd7f000)       = 0x5569ecd7f000 
    21.409221 brk(0x5569ecda0000)       = 0x5569ecda0000 
    21.265440 brk(0x5569ecdc1000)       = 0x5569ecdc1000 
    10.985522 brk(0x5569ece40000)       = 0x5569ece40000 
     0.003199 brk(0x5569ecee7000)       = 0x5569ecee7000 
     0.004947 brk(0x5569ecf76000)       = 0x5569ecf76000 
     0.015022 brk(0x5569ecf98000)       = 0x5569ecf98000 
     0.001297 brk(0x5569ecfbc000)       = 0x5569ecfbc000 
     0.001247 brk(0x5569ecfe0000)       = 0x5569ecfe0000 
(the output shortened here as it simply continues repeatedly)

Ok, the process y2start is thrashing around readjusting the heap (program break) which it continues to do for a very long, indeterminate time. Eventually it settles and enters the Network Settings screen then appears to work properly. This very much looks to be a bug in the y2start process.

Comments?

enjoy...

**deano_ferrari** · 07-Oct-2020, 17:14

Anything interesting reported in y2log?

**fosdex** · 07-Oct-2020, 20:51

Originally Posted by deano_ferrari

Anything interesting reported in y2log?

Nothing that is an obvious warning, error or other complaint...looks like ordinary process chatter...but I am not at all familiar with Yast internals.

enjoy...

**fosdex** · 08-Oct-2020, 22:44

Filed a bug report on this - bug 1177503.

Thanks to all for your input!

**fosdex** · 26-Oct-2020, 22:53

Just a note to close this thread. YaST Network Setting initialization running slow is a know and confirmed "behaviour", "feature" or "bug". It occurs because the /etc/hosts file is parsed and loaded as part of Network Setting initialization. The larger the /etc/hosts file, the longer Network Settings initialization takes and seems to be nlog(n) for Big O fans. Upshot is, if you are using hosts to block domains then you will notice the slow initialization in Network Settings, so just wait.

A better solution to domain blocking is a DNS firewall which is what I was setting up when I stumbled upon this issue with Network Settings. I have implemented the unbound DNS resolver as a DNS firewall using RPZ to replace hosts blocking. Works like a charm. The only caveat is that RPZ is implemented in unbound v1.10 and the version in Leap 15.2 is v1.6. However, Tumbleweed (as of this writing) has a build of unbound v1.12 for Leap 15.2 which works fine.

enjoy...