This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1832472 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1832472 Title: cdc_ncm floods syslog unneccessarily Status in linux package in Ubuntu: Incomplete Bug description: Upon plugging in a USB adapter for NBase-T ethernet with an Realtek chip RTL8156 the kernel module cdc_ncm starts flooding /var/log/syslog with unneccessary status info. The status lines either say that there's no ethernet link or show the interface as connected and state the link speed. The relevant parts from /var/log/syslog after attaching the adapter without ethernet link read like this: [...] Jun 12 10:48:58 resdz-v13 kernel: [ 4240.398485] usb 2-3: new SuperSpeed Gen 1 USB device number 5 using xhci_hcd Jun 12 10:48:58 resdz-v13 kernel: [ 4240.419463] usb 2-3: New USB device found, idVendor=0bda, idProduct=8156, bcdDevice=30.00 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.419469] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=6 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.419472] usb 2-3: Product: USB 10/100/1G/2.5G LAN Jun 12 10:48:58 resdz-v13 kernel: [ 4240.419475] usb 2-3: Manufacturer: Realtek Jun 12 10:48:58 resdz-v13 kernel: [ 4240.419477] usb 2-3: SerialNumber: 000000001 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.447769] cdc_ncm 2-3:2.0: MAC-Address: 00:13:3b:68:00:e9 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.447775] cdc_ncm 2-3:2.0: setting rx_max = 16384 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.447929] cdc_ncm 2-3:2.0: setting tx_max = 16384 Jun 12 10:48:58 resdz-v13 kernel: [ 4240.448901] cdc_ncm 2-3:2.0 usb0: register 'cdc_ncm' at usb-0000:00:14.0-3, CDC NCM, 00:13:3b:68:00:e9 Jun 12 10:48:58 resdz-v13 NetworkManager[916]: <info> [1560329338.1872] manager: (usb0): new Ethernet device (/org/freedesktop/NetworkManager/Devices/8) Jun 12 10:48:58 resdz-v13 mtp-probe: checking bus 2, device 5: "/sys/devices/pci0000:00/0000:00:14.0/usb2/2-3" Jun 12 10:48:58 resdz-v13 mtp-probe: bus: 2, device: 5 was not an MTP device Jun 12 10:48:58 resdz-v13 systemd-udevd[4299]: Using default interface naming scheme 'v240'. Jun 12 10:48:58 resdz-v13 systemd-udevd[4299]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable. Jun 12 10:48:58 resdz-v13 kernel: [ 4240.466476] cdc_ncm 2-3:2.0 enx00133b6800e9: renamed from usb0 Jun 12 10:48:58 resdz-v13 NetworkManager[916]: <info> [1560329338.2315] device (usb0): interface index 7 renamed iface from 'usb0' to 'enx00133b6800e9' Jun 12 10:48:58 resdz-v13 systemd-udevd[4299]: Process 'vlan-network-interface UDEV' failed with exit code 1. Jun 12 10:48:58 resdz-v13 NetworkManager[916]: <info> [1560329338.2431] device (enx00133b6800e9): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external') Jun 12 10:48:58 resdz-v13 charon: 12[KNL] interface enx00133b6800e9 activated Jun 12 10:48:58 resdz-v13 mtp-probe: checking bus 2, device 5: "/sys/devices/pci0000:00/0000:00:14.0/usb2/2-3" Jun 12 10:48:58 resdz-v13 mtp-probe: bus: 2, device: 5 was not an MTP device Jun 12 10:48:58 resdz-v13 kernel: [ 4240.524052] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: disconnected Jun 12 10:48:58 resdz-v13 kernel: [ 4240.556109] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: disconnected Jun 12 10:48:58 resdz-v13 kernel: [ 4240.588054] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: disconnected Jun 12 10:48:58 resdz-v13 kernel: [ 4240.620383] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: disconnected Jun 12 10:48:58 resdz-v13 kernel: [ 4240.652415] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: disconnected [...] Upon plugging in the ethernet cable I see [...] Jun 12 10:49:01 resdz-v13 kernel: [ 4243.372273] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.404278] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected [...] and Network Manager starts its work. After the interface is up the flooding continues: [...] Jun 12 10:49:01 resdz-v13 kernel: [ 4243.564056] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.596051] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 whoopsie[1530]: [10:49:01] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/4 Jun 12 10:49:01 resdz-v13 whoopsie[1530]: [10:49:01] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/4 Jun 12 10:49:01 resdz-v13 whoopsie[1530]: [10:49:01] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/4 Jun 12 10:49:01 resdz-v13 whoopsie[1530]: [10:49:01] online Jun 12 10:49:01 resdz-v13 kernel: [ 4243.628055] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.660060] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4243.692055] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.724054] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4243.756060] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.788053] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4243.820056] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 nm-dispatcher: req:2 'connectivity-change': start running ordered scripts... Jun 12 10:49:01 resdz-v13 kernel: [ 4243.852060] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4243.884064] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.916054] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4243.948055] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4243.980049] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected Jun 12 10:49:01 resdz-v13 kernel: [ 4244.012056] cdc_ncm 2-3:2.0 enx00133b6800e9: 1000 mbit/s downlink 1000 mbit/s uplink Jun 12 10:49:01 resdz-v13 kernel: [ 4244.044053] cdc_ncm 2-3:2.0 enx00133b6800e9: network connection: connected [...] Expected behavior is showing the status lines only once after link status changes. Kernel version is: 5.0.0-16-generic, OS: Kubuntu 19.04 Module info for cdc_ncm: filename: /lib/modules/5.0.0-16-generic/kernel/drivers/net/usb/cdc_ncm.ko license: Dual BSD/GPL description: USB CDC NCM host driver author: Hans Petter Selasky srcversion: 9CC08FECEC9EC4AF1DBA207 alias: usb:v*p*d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v1546p1010d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v1519p0443d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v12D1p*d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v0930p*d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v413Cp*d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v413Cp81BCd*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v413Cp81BBd*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v1BC7p0036d*dc*dsc*dp*ic02isc0Dip00in* alias: usb:v0BDBp*d*dc*dsc*dp*ic02isc0Dip00in* depends: usbnet retpoline: Y intree: Y name: cdc_ncm vermagic: 5.0.0-16-generic SMP mod_unload sig_id: PKCS#7 signer: sig_key: sig_hashalgo: md4 signature: 30:82:02:A5:06:09:2A:86:48:86:F7:0D:01:07:02:A0:82:02:96:30: 82:02:92:02:01:01:31:0D:30:0B:06:09:60:86:48:01:65:03:04:02: 03:30:0B:06:09:2A:86:48:86:F7:0D:01:07:01:31:82:02:6F:30:82: 02:6B:02:01:01:30:46:30:2E:31:2C:30:2A:06:03:55:04:03:0C:23: 42:75:69:6C:64:20:74:69:6D:65:20:61:75:74:6F:67:65:6E:65:72: 61:74:65:64:20:6B:65:72:6E:65:6C:20:6B:65:79:02:14:6C:D7:37: E7:FA:BA:B9:CE:27:58:03:41:8C:55:76:76:23:DB:D6:27:30:0B:06: 09:60:86:48:01:65:03:04:02:03:30:0D:06:09:2A:86:48:86:F7:0D: 01:01:01:05:00:04:82:02:00:4D:14:7A:17:B0:09:83:C0:B7:24:84: 3C:33:F0:C6:CA:70:11:69:13:F5:CC:57:11:1F:DA:AD:05:5A:A5:44: 7F:A1:3C:9E:C1:A0:F5:0F:D1:1E:29:A9:A3:5C:61:24:0E:59:EA:83: C5:B2:1D:A5:2A:FD:22:E0:B3:22:0F:CC:62:D8:EB:DE:51:22:FB:D4: 19:78:FA:36:65:BE:81:58:F2:D8:F8:4C:76:07:6A:4F:99:01:DC:DD: 73:10:3C:D4:60:0A:CE:1E:E3:30:58:83:1F:1E:A1:ED:FF:01:D2:8F: 74:01:74:3E:A7:56:DC:E8:3C:56:BA:DB:2A:EE:69:B0:16:88:46:41: 2F:18:19:01:46:F0:A9:22:C9:48:C7:DA:DB:43:67:8A:97:9E:CB:AB: 63:36:9E:31:61:34:5A:D3:77:76:01:19:A0:08:B3:C0:83:B0:53:FE: F3:92:7C:38:ED:41:A3:FB:84:29:86:04:B0:08:50:B1:C8:28:49:0D: 9C:22:30:43:62:7F:BC:F2:88:08:09:50:0F:FE:09:AD:E4:22:FA:3B: B6:5F:95:7E:48:E0:0D:62:D2:F0:35:6C:21:BD:8B:54:9A:5A:32:CE: 0D:71:F5:80:1B:52:3D:1F:45:4D:B2:10:6C:7B:49:E0:3D:D7:5A:22: 94:A1:8B:99:8E:09:90:A7:41:43:FF:FC:DC:FE:21:D3:90:87:F9:34: C3:7C:2D:46:A9:3F:20:36:D3:99:1F:D5:34:5C:E6:F2:D5:B2:8D:09: 15:ED:D1:E7:ED:DE:49:4C:B4:A9:FD:5E:35:47:86:75:A7:64:BB:1F: 1C:85:58:8C:CF:C0:F7:52:DB:79:3F:76:22:6D:13:ED:5B:99:E1:5A: D2:01:1D:54:80:20:78:D8:33:B2:61:15:3A:44:BC:0D:C5:2C:7D:32: C6:26:CE:39:46:DA:64:9D:83:95:A3:01:82:D3:87:7F:48:DC:CA:40: F5:41:DC:BA:0F:96:C0:88:97:DD:5B:B4:80:0C:33:B9:CE:C0:97:D0: C4:94:B2:24:5E:D3:9C:0D:1E:99:27:13:51:9D:8A:1D:F7:04:9C:7C: 11:DD:78:7A:29:DE:06:1A:61:C4:D7:4B:49:C7:4C:EE:0D:6A:15:47: AF:E7:31:4B:1E:C8:A0:B5:A2:24:EB:3F:37:2A:98:93:A0:D5:CE:A3: EE:78:38:FC:11:7D:4B:8C:2E:FF:9C:95:0E:CE:03:2A:73:A3:A1:FC: 48:71:97:3B:C3:09:F3:D5:AD:99:AB:8E:51:18:DC:6B:1A:85:DA:E3: 40:4B:D2:E8:E4:AF:82:1E:F5:19:D2:ED:35:D5:1A:83:D7:2D:20:4A: 1C parm: prefer_mbim:Prefer MBIM setting on dual NCM/MBIM functions (bool) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832472/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp