Hi all,

a few days ago I installed the latest Antergos on my Lenovo Thinkpad T450s. So far, i was able to set up everything necessary for my produktive work.
I observed a strange behavior/crash when trying to use my WWAN connection. When the WWAN connects to a mobile network, my NetworkManager crashes, and the KDE Network-Applet disappears. The strange thing is, that afterwards i still have a internet connection. I can stop the ModemManager and restart the NetworkManager. But as soon as I start the ModemManager again, the NetworkManager crashed again.

Here are Some logs of the Network- and ModemManager:

NetworkManager:

sudo systemctl status NetworkManager
● NetworkManager.service - Network Manager 
  Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: disabled) 
  Active: failed (Result: core-dump) since Thu 2017-03-16 10:12:50 CET; 15s ago 
    Docs: man:NetworkManager(8) 
 Process: 1349 ExecStart=/usr/bin/NetworkManager --no-daemon (code=dumped, signal=ABRT) 
Main PID: 1349 (code=dumped, signal=ABRT) 

Mär 16 10:12:50 Razer-X systemd[1]: NetworkManager.service: Service hold-off time over, scheduling restart. 
Mär 16 10:12:50 Razer-X systemd[1]: Stopped Network Manager. 
Mär 16 10:12:50 Razer-X systemd[1]: NetworkManager.service: Start request repeated too quickly. 
Mär 16 10:12:50 Razer-X systemd[1]: Failed to start Network Manager. 
Mär 16 10:12:50 Razer-X systemd[1]: NetworkManager.service: Unit entered failed state. 
Mär 16 10:12:50 Razer-X systemd[1]: NetworkManager.service: Failed with result 'core-dump'.

ModemManager:

● ModemManager.service - Modem Manager 
  Loaded: loaded (/usr/lib/systemd/system/ModemManager.service; enabled; vendor preset: disabled) 
  Active: active (running) since Thu 2017-03-16 10:12:08 CET; 3min 29s ago 
Main PID: 495 (ModemManager) 
   Tasks: 5 (limit: 4915) 
  CGroup: /system.slice/ModemManager.service 
          ├─495 /usr/bin/ModemManager 
          └─549 /usr/lib/libmbim/mbim-proxy 

Mär 16 10:12:50 Razer-X ModemManager[495]: <info>  Simple connect state (4/8): Wait to get fully enabled 
Mär 16 10:12:50 Razer-X ModemManager[495]: <info>  Simple connect state (5/8): Register 
Mär 16 10:12:50 Razer-X ModemManager[495]: <info>  Simple connect state (6/8): Bearer 
Mär 16 10:12:50 Razer-X ModemManager[495]: <info>  Simple connect state (7/8): Connect 
Mär 16 10:12:50 Razer-X ModemManager[495]: <info>  Simple connect state (8/8): All done 
Mär 16 10:13:12 Razer-X ModemManager[495]: <warn>  Reloading stats failed: OperationNotAllowed 
Mär 16 10:13:42 Razer-X ModemManager[495]: <warn>  Reloading stats failed: OperationNotAllowed 
Mär 16 10:14:12 Razer-X ModemManager[495]: <warn>  Reloading stats failed: OperationNotAllowed 
Mär 16 10:14:42 Razer-X ModemManager[495]: <warn>  Reloading stats failed: OperationNotAllowed 
Mär 16 10:15:12 Razer-X ModemManager[495]: <warn>  Reloading stats failed: OperationNotAllowed

ifconfig wwp0s20u4:

wwp0s20u4: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST>  mtu 1428 
       inet 10.33.70.250  netmask 255.255.255.0  broadcast 10.33.70.255 
       inet6 fe80::9b6d:c235:f1fa:7bc1  prefixlen 64  scopeid 0x20<link> 
       inet6 ::45fe:fe7b:f777:34d3  prefixlen 64  scopeid 0x0<global> 
       ether e6:7c:ad:49:67:05  txqueuelen 1000  (Ethernet) 
       RX packets 3959  bytes 3814687 (3.6 MiB) 
       RX errors 0  dropped 0  overruns 0  frame 0 
       TX packets 4558  bytes 342865 (334.8 KiB) 
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

uname -r

4.10.1-1-ARCH

lsusb | grep Sierra

Bus 001 Device 010: ID 1199:a001 Sierra Wireless, Inc.

It seems to me, that this is an issue, with the modem module Sierra Wireless EM7345 itself. I googled for this issue, but wasn’t able to find a fix. I tried also the lts kernel, but with no success.

Does anyone have an idea, what i could try?

Thanks and Regards,

mf