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resolv.conf symlink breaks with /run/NetworkManager/resolv.conf disappearing

    • Open Issue created by Stefan Schmidt @stefanschmidt

    The module affected

    NetworkManager

    What is the action to reproduce the bug?

    I boot a Pi4 system without ethernet attached and wifi via rfkill after boot (nmcli r wifi off)

    Attaching a USB modem gives a wwan device which can be setup as NM connection:

    nmcli connection add type gsm ifname '*' con-name 'Oniro-WWAN' apn '
web.vodafone.de' connection.autoconnect yes
Connection 'Oniro-WWAN' (10979f57-a3d4-4290-90fe-7a36990a396b) successfully added.

    What is the result you see?

    The connection gets established, but address resolution does not work:

    root@eddie-server:~# ping google.com
ping: bad address 'google.com'
root@eddie-server:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=113 time=116.157 ms
64 bytes from 8.8.8.8: seq=1 ttl=113 time=21.811 ms

    Coming from the fact that the /etc/resolv.conf symlinks to /run/NetworkManager/resolv.conf (through one indirection) which does not exist.

    root@eddie-server:/etc# ls -al /etc/resolv.conf
lrwxrwxrwx    1 root     root            31 Mar  9  2018 /etc/resolv.conf -> /etc/resolv-conf.NetworkManager
root@eddie-server:/etc# ls -al /etc/resolv-conf.NetworkManager
lrwxrwxrwx    1 root     root            33 Mar  9  2018 /etc/resolv-conf.NetworkManager -> ../run/NetworkManager/resolv.conf
root@eddie-server:/etc# ls -al ../run/NetworkManager/resolv.conf
ls: ../run/NetworkManager/resolv.conf: No such file or directory

    I already disabled systemd-resolvd and made sure it does not start up after a reboot, but this did yield no change.

    What is the result you expect?

    Working resolv.conf symlink and address resolution

    Frequency?

    Always, but with extra hardware (usb wwan modem)

    Tested version

    root@eddie-server:~# cat /etc/os-release
ID=oniro-linux-blueprint-eddie
NAME="Oniro Project EDDIE Blueprint Linux Distro"
VERSION="1.99.99 (dev)"
VERSION_ID=1.99.99
PRETTY_NAME="Oniro Project EDDIE Blueprint Linux Distro 1.99.99 (dev)"
DISTRO_CODENAME="dev"

    Do you know any workaround of this issue?

    Manually setting up resolv.conf

    Do you have a fix for this issue?

    No

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    • Activity

    • Stefan Schmidt assigned to @landgraf

      assigned to @landgraf

    • Pavel Zhukov added teammaintenance label

      added teammaintenance label

    • Stefan Schmidt
      Stefan Schmidt @stefanschmidt ·
      Author Contributor

      One critical comment would be that it works when I have the ethernet cable connected. NM picks that connection up and happily creates a /run/NetworkManager/resolv.conf file and the symlinks started working fine.

    • Pavel Zhukov added IssueBug label

      added IssueBug label

    • Luca Zizolfi added SeverityNormal label

      added SeverityNormal label

    • Pavel Zhukov changed iteration to Oniro Core Iterations Jun 1, 2022 - Jun 30, 2022

      changed iteration to Oniro Core Iterations Jun 1, 2022 - Jun 30, 2022

    • Pavel Zhukov changed milestone to %goofy beta

      changed milestone to %goofy beta

    • Pavel Zhukov added to epic &126

      added to epic &126

    • Pavel Zhukov marked this issue as related to #632 (closed)

      marked this issue as related to #632 (closed)

    • Luca Favaretto marked this issue as related to #633 (closed)

      marked this issue as related to #633 (closed)

    • Luca Favaretto removed the relation with #633 (closed)

      removed the relation with #633 (closed)

    • Pavel Zhukov added Doing label

      added Doing label

    • Pavel Zhukov changed iteration to Oniro Core Iterations Jul 1, 2022 - Jul 31, 2022

      changed iteration to Oniro Core Iterations Jul 1, 2022 - Jul 31, 2022

    • Pavel Zhukov added needs-investigation label

      added needs-investigation label

    • Pavel Zhukov
      Pavel Zhukov @landgraf ·
      Contributor

      @stefanschmidt could not reproduce. Steps I've taken:

      • Built eddie (2.0.0-alpha (dev) with following local.conf:
      IMAGE_INSTALL:append = " usb-modeswitch " => This is needed for my modem to switch to modem mode from CD-ROM
PACKAGECONFIG:pn-networkmanager:append = " modemmanager " => This is needed to build NM with MM support. Eddie doesn't do it by default
      • DISTRO="oniro-linux-blueprint-eddie" MACHINE=raspberrypi4-64 bitbake blueprint-eddie-image 
      
Build Configuration:
BB_VERSION           = "2.0.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-oniro-linux-musl"
MACHINE              = "raspberrypi4-64"
DISTRO               = "oniro-linux-blueprint-eddie"
DISTRO_VERSION       = "2.0.0-alpha"
TUNE_FEATURES        = "aarch64 armv8a crc cortexa72"
TARGET_FPU           = ""
meta-oniro-staging   = "abi_checker:1f982923c0e9950e57132a14792401780d8bf21e"
meta                 = "HEAD:0f7a8359ba370c7f5d5153453ed699e9566f5b1d"
meta-arm             
meta-arm-toolchain   = "HEAD:a8cb33d5139e30b4a643da9a277487299c0e658f"
meta-clang           = "HEAD:72187036fe88850fe1a89fb4a3d53d2134680ccf"
meta-zephyr-bsp      
meta-zephyr-core     = "oniro/kirkstone:a2989a0859b7534b2ba84902a7f16baa5a9851ad"
meta-oniro-core      = "abi_checker:1f982923c0e9950e57132a14792401780d8bf21e"
meta-freertos        = "HEAD:98a6838261d36b8f79c5fbae1736492169727a1e"
meta-intel           = "HEAD:8e472da759cd5a5bf2ece041d2796db56b1d5482"
meta-seco-intel      = "HEAD:65a673560211b11986db5785c70254fad190785f"
meta-freescale       = "HEAD:92df6b76f38397b75ea76d588935b5b91b63c58c"
meta-seco-imx        = "HEAD:b82eaf8b0a2abe775c158b0a069b7bb7894ec8e6"
meta-oe              
meta-filesystems     
meta-networking      
meta-perl            
meta-python          = "HEAD:fcc7d7eae82be4c180f2e8fa3db90a8ab3be07b7"
meta-raspberrypi     = "HEAD:0135a02ea577bd39dd552236ead2c5894d89da1d"
meta-security        = "HEAD:d3d8e62bf1caa3870a504c0addcfd200b33c189f"
meta-riscv           = "master:29748ea24e3671ef37598f3bc400b6868e4c473a"
meta-rauc            = "HEAD:4429bd1f29677c9a7de032d53240fb4791a41e1f"
meta-oniro-blueprints-core = "HEAD:155673eb04064f3babb17adc19b4ab9d068d1432"
meta-oniro-blueprints-eddie = "HEAD:b2f3407b7c24423d67b608323c688653c9cc3a8c"
      • Booted system
      • nmcli r wifi off
      • nmcli connection add type gsm con-name 'Vodafone' apn 'internet' connection.autoconnect yes

      Connection Vodafone is active, /run/NetworkManager/resolv.conf is there and properly populated.

    • Pavel Zhukov removed Doing label

      removed Doing label

    • Pavel Zhukov removed iteration Oniro Core Iterations Jul 1, 2022 - Jul 31, 2022

      removed iteration Oniro Core Iterations Jul 1, 2022 - Jul 31, 2022

    • Pavel Zhukov added blockedreproducer label

      added blockedreproducer label

    • Stefan Schmidt
      Stefan Schmidt @stefanschmidt ·
      Author Contributor

      I re-tested this with todays HEAD (saw a modemmanager update from meta-openembedded coming in). Its still the same for me. Below are the logs from journalctl.

      root@blueprint-gateway:~# journalctl -u ModemManager
Apr 28 17:42:31 blueprint-gateway systemd[1]: Starting Modem Manager...
Apr 28 17:42:32 blueprint-gateway systemd[1]: Started Modem Manager.
      Starting Network Manager...
<info>  [1651167752.3702] NetworkManager (version 1.36.2) is starting... (for the first time)
<info>  [1651167752.3705] Read config: /etc/NetworkManager/NetworkManager.conf
Started Network Manager.
<info>  [1651167752.3881] bus-manager: acquired D-Bus service "org.freedesktop.NetworkManager"
<info>  [1651167752.4416] manager[0x7fb699e030]: monitoring kernel firmware directory '/lib/firmware'.
<info>  [1651167753.1964] hostname: hostname: using hostnamed
<info>  [1651167753.1972] hostname: static hostname changed from (none) to "blueprint-gateway"
<info>  [1651167753.1995] dns-mgr[0x7fb69eaa50]: init: dns=default,systemd-resolved rc-manager=symlink (auto)
<info>  [1651167753.2051] rfkill0: found Wi-Fi radio killswitch (at /sys/devices/platform/soc/fe300000.mmcnr/mmc_host/mmc1/mmc1:0>
<info>  [1651167753.2068] manager[0x7fb699e030]: rfkill: Wi-Fi hardware radio set enabled
<info>  [1651167753.2069] manager[0x7fb699e030]: rfkill: WWAN hardware radio set enabled
<info>  [1651167753.2352] Loaded device plugin: NMBluezManager (/usr/lib/NetworkManager/1.36.2/libnm-device-plugin-bluetooth.so)
<info>  [1651167753.2377] Loaded device plugin: NMWwanFactory (/usr/lib/NetworkManager/1.36.2/libnm-device-plugin-wwan.so)
<info>  [1651167753.2426] Loaded device plugin: NMWifiFactory (/usr/lib/NetworkManager/1.36.2/libnm-device-plugin-wifi.so)
<info>  [1651167753.2450] manager: rfkill: Wi-Fi enabled by radio killswitch; enabled by state file
<info>  [1651167753.2458] manager: rfkill: WWAN enabled by radio killswitch; enabled by state file
<info>  [1651167753.2469] manager: Networking is enabled by state file
<info>  [1651167753.2516] settings: Loaded settings plugin: keyfile (internal)
<info>  [1651167753.2817] dhcp-init: Using DHCP client 'internal'
<info>  [1651167753.2826] device (lo): carrier: link connected
<info>  [1651167753.2850] manager: (lo): new Generic device (/org/freedesktop/NetworkManager/Devices/1)
<info>  [1651167753.2960] manager: (eth0): new Ethernet device (/org/freedesktop/NetworkManager/Devices/2)
<info>  [1651167753.3073] settings: (eth0): created default wired connection 'Wired connection 1'
<info>  [1651167753.3082] device (eth0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
<info>  [1651167753.3409] device (wlan0): driver supports Access Point (AP) mode
<info>  [1651167753.3448] manager: (wlan0): new 802.11 Wi-Fi device (/org/freedesktop/NetworkManager/Devices/3)
<info>  [1651167753.3475] device (wlan0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
<info>  [1651167753.9131] device (wlan0): set-hw-addr: set MAC address to 6E:61:B0:20:55:82 (scanning)
<info>  [1651167753.9366] manager: (wpan0): new Tun device (/org/freedesktop/NetworkManager/Devices/4)
<info>  [1651167753.9432] manager: (nat64): new Tun device (/org/freedesktop/NetworkManager/Devices/5)
<info>  [1651167754.0139] modem-manager: ModemManager available
<info>  [1651167754.1767] device (wlan0): supplicant interface state: internal-starting -> disconnected
<info>  [1651167754.1771] device (wlan0): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-sta>
<info>  [1651167757.0188] policy: auto-activating connection 'SoftAP' (3b73c72c-be72-4458-9fd7-e8b1d6ee4e8d)
<info>  [1651167757.0250] device (wlan0): Activation: starting connection 'SoftAP' (3b73c72c-be72-4458-9fd7-e8b1d6ee4e8d)
<info>  [1651167757.0267] device (wlan0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
<info>  [1651167757.0294] manager: NetworkManager state is now CONNECTING
<info>  [1651167757.5941] device (wlan0): set-hw-addr: reset MAC address to DC:A6:32:BA:48:B2 (preserve)
<info>  [1651167757.6098] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
<info>  [1651167757.6137] device (wlan0): Activation: (wifi) access point 'SoftAP' has security, but secrets are required.
<info>  [1651167757.6139] device (wlan0): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
<info>  [1651167757.6161] device (wlan0): supplicant interface state: disconnected -> interface_disabled
<info>  [1651167757.6337] device (wpan0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: '>
<info>  [1651167757.6390] device (wpan0): state change: unavailable -> disconnected (reason 'connection-assumed', sys-iface-state>
<info>  [1651167757.6434] device (wpan0): Activation: starting connection 'wpan0' (d47a2a94-e94b-4469-8431-1dcaede2bf75)
<info>  [1651167757.6436] device (wlan0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
<info>  [1651167757.6485] device (wlan0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
<info>  [1651167757.6502] device (wlan0): Activation: (wifi) connection 'SoftAP' has security, and secrets exist.  No new secrets>
<info>  [1651167757.6504] Config: added 'ssid' value 'Oniro Project WiFi'
<info>  [1651167757.6505] Config: added 'mode' value '2'
<info>  [1651167757.6506] Config: added 'frequency' value '2437'
<info>  [1651167757.6508] Config: added 'freq_list' value '2437'
<info>  [1651167757.6510] Config: added 'key_mgmt' value 'WPA-PSK WPA-PSK-SHA256'
<info>  [1651167757.6510] Config: added 'psk' value '<hidden>'
<info>  [1651167757.6511] Config: added 'proto' value 'RSN'
<info>  [1651167757.6512] Config: added 'pairwise' value 'CCMP'
<info>  [1651167757.6513] Config: added 'group' value 'CCMP'
<info>  [1651167757.6532] device (wlan0): supplicant interface state: interface_disabled -> inactive
<info>  [1651167757.6542] device (wpan0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.6566] device (wpan0): state change: prepare -> config (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.6589] device (wpan0): state change: config -> ip-config (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.6611] device (wpan0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.7523] device (wpan0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.7535] device (wpan0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'external')
<info>  [1651167757.7721] device (wpan0): Activation: successful, device activated.
<info>  [1651167757.9262] device (wlan0): supplicant interface state: inactive -> completed
<info>  [1651167757.9264] device (wlan0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Started Wi-Fi Hotspot "O>
<info>  [1651167757.9271] device (wlan0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
<warn>  [1651167758.2362] device (wlan0): ip:shared4: could not start dnsmasq: Could not find "dnsmasq" binary
<info>  [1651167776.2061] manager: (cdc-wdm0): new Broadband device (/org/freedesktop/NetworkManager/Devices/6)
<info>  [1651167776.2133] device (cdc-wdm0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external>
<info>  [1651167776.2154] device (cdc-wdm0): modem state 'enabling'
<info>  [1651167776.2195] device (cdc-wdm0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
<info>  [1651167785.6858] manager: rfkill: Wi-Fi hardware radio set disabled
<info>  [1651167785.6865] device (wlan0): state change: ip-config -> unavailable (reason 'none', sys-iface-state: 'managed')
<info>  [1651167785.7468] device (wlan0): set-hw-addr: set MAC address to 36:A0:6F:04:EA:89 (scanning)
<info>  [1651167785.7504] manager: NetworkManager state is now CONNECTED_LOCAL
<info>  [1651167785.7761] manager: startup complete
<info>  [1651167785.7778] audit: op="radio-control" arg="wireless-enabled:off" pid=520 uid=0 result="success"
<info>  [1651167785.7818] manager: rfkill: Wi-Fi now disabled by radio killswitch
<info>  [1651167821.9908] audit: op="connection-add" uuid="c222564d-908d-491b-b55e-56cba60598b0" name="Oniro-WWAN" pid=534 uid=0 >
<info>  [1651167821.9928] policy: auto-activating connection 'Oniro-WWAN' (c222564d-908d-491b-b55e-56cba60598b0)
<info>  [1651167821.9953] device (cdc-wdm0): Activation: starting connection 'Oniro-WWAN' (c222564d-908d-491b-b55e-56cba60598b0)
<info>  [1651167821.9959] device (cdc-wdm0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
<info>  [1651167821.9976] manager: NetworkManager state is now CONNECTING
<info>  [1651167822.1153] device (cdc-wdm0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
<info>  [1651167822.1177] device (cdc-wdm0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
<info>  [1651167822.1197] dhcp4 (wwp1s0u1u3i3): activation: beginning transaction (timeout in 15 seconds)
<warn>  [1651167822.1220] device (cdc-wdm0): retrieving IP configuration failed: modem IP method unsupported
<info>  [1651167822.1356] dhcp4 (wwp1s0u1u3i3): state changed new lease, address=100.96.61.16
<info>  [1651167822.1444] device (cdc-wdm0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
<info>  [1651167822.2083] device (cdc-wdm0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
<info>  [1651167822.2095] device (cdc-wdm0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
<info>  [1651167822.2113] manager: NetworkManager state is now CONNECTED_LOCAL
<info>  [1651167822.2170] manager: NetworkManager state is now CONNECTED_SITE
<info>  [1651167822.2186] policy: set 'Oniro-WWAN' (wwp1s0u1u3i3) as default for IPv4 routing and DNS
<info>  [1651167822.2206] device (cdc-wdm0): Activation: successful, device activated.
<info>  [1651167822.2236] manager: NetworkManager state is now CONNECTED_GLOBAL

      If we look at the last 20 lines (after startup completed) we see that I rfkill off wifi and after that add the connection in modemmanager. NM picks its up and end in a CONNECTED_GLOBAL state. Not aware on any problem with resolv.conf / DNS.

    • Luca Favaretto removed SeverityNormal label

      removed SeverityNormal label

    • Luca Favaretto added SeverityLow label

      added SeverityLow label

    • Luca Favaretto unassigned @landgraf

      unassigned @landgraf

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