The code above formulates, sends and (in a second executable) receives ethernet frames. The network namespaces are set up to enable this. The ethernet frames are unusual for two reasons: they are long (2156 MTU), and they are typed as non-IP (or ARP). Also, they don't use the MAC addresses that the interfaces have (but this should be no problem as the interfaces are put in promiscuous mode and, as stated before, on 4.4.0-128-generic, this test works fine). I'll expand on the test to see if it is to do with length or type. I'll also formulate a regular IP frame and see if it comes through regardless.
-- 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/1780103 Title: Network namespaces support for non-IP suddenly missing Status in linux package in Ubuntu: Incomplete Bug description: I run 16.04, and I keep daily track of all dist-upgrades. Yesterday (3 july 2018) there was an upgrade, and it must have been a kernel upgrade, because my machine had rebooted (which I make it do automatically if needed). From today, the system tests on my project have stopped working (C development). These system tests do the following: using the 'ip' command, they set up several network namespaces, in which I run several executables concurrently, that exchange network messages with each other. The namespaces that use IP have kept on working, while the ones that don't (I'm implementing an ethernet network packet structure of my own) have stopped working. I've done the same tests on my laptop, which is also a 16.04, on which I haven't done the upgrade (and I'm very hesitant to do so now, because this is my bread and butter), and there they work still. --- ApportVersion: 2.20.1-0ubuntu2.18 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: kees 1919 F.... pulseaudio /dev/snd/seq: timidity 1084 F.... timidity DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=3ed19ff5-7945-42ac-a22a-9136402798d8 InstallationDate: Installed on 2018-02-06 (148 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1) IwConfig: lo no wireless extensions. enp1s0 no wireless extensions. Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 046d:c30e Logitech, Inc. UltraX Keyboard (Y-BL49) Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-128-generic root=UUID=43c7f0dc-00d1-4bb5-86c0-9ac982fbe227 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-128.154-generic 4.4.131 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-128-generic N/A linux-backports-modules-4.4.0-128-generic N/A linux-firmware 1.157.19 RfKill: Tags: xenial Uname: Linux 4.4.0-128-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 03/16/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F4 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H110M-S2H-CF dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd03/16/2016:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH110M-S2H-CF:rvrx.x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. --- ApportVersion: 2.20.1-0ubuntu2.18 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: kees 1920 F.... pulseaudio /dev/snd/seq: timidity 1065 F.... timidity DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=3ed19ff5-7945-42ac-a22a-9136402798d8 InstallationDate: Installed on 2018-02-06 (148 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1) IwConfig: lo no wireless extensions. enp1s0 no wireless extensions. Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 046d:c30e Logitech, Inc. UltraX Keyboard (Y-BL49) Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-130-generic root=UUID=43c7f0dc-00d1-4bb5-86c0-9ac982fbe227 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-130-generic N/A linux-backports-modules-4.4.0-130-generic N/A linux-firmware 1.157.19 RfKill: Tags: xenial Uname: Linux 4.4.0-130-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 03/16/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F4 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H110M-S2H-CF dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd03/16/2016:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH110M-S2H-CF:rvrx.x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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