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-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1843381 Title: Dell system takes a long time to connect network with external dock Status in OEM Priority Project: New Status in systemd package in Ubuntu: Invalid Status in systemd source package in Bionic: Fix Committed Status in systemd source package in Disco: Fix Released Status in systemd source package in Eoan: Invalid Bug description: [impact] On Dell system with BIOS-based "MAC passthrough", there can be multiple USB nics with identical MAC addresses. Since the udev rules in Debian and Ubuntu assign interface names for USB nics by mac address (because that is the only consistent identifier for USB nics; their path can change based on which USB port they are connected to), it's impossible to name two interfaces with the same name. As Ubuntu also carries a patch to retry renaming of any interface when the first renaming fails, this causes a 90 second delay before being able to the "MAC passthrough" nic after connecting it. [test case] On a system with this "MAC passthrough" enabled and required devices, boot the system and then connect to the dock or connect the second USB nic with identical MAC. It will not be usable for 90 seconds as its renames takes that long to timeout. [regression potential] the change here is very limited to only Dell systems with the specific USB vendor/product ID affected by this, and additionally the change only sets a ENV flag in the udev rule, which is later used by udevd to skip the rename-retries for 90 seconds. So, the regression potential for anyone else without a system affected by this "MAC passthrough" should be very low, and any regression potential for those with this "MAC passthrough" should still be low, as this only skips the rename- retry that we know will never succeed. However, the regression potential is likely limited to failure to properly name a USB nic, or other bugs during the udev processing of new USB nics. [other info] original description: --- This is a bug reopen from https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1837700 The original one caused systemd regressed. https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1842651 This issue needs an alternative solution. -------------------------------------------------------------------------------- Dell has a feature called MAC addrss passthrough[1] that would force usb ethernet adapters to be assigned with a predefined MAC address stored in BIOS or so. This feature has been landed to mainline kernel in driver r8152[2]. So whenever a r8152 managed device is plugged into Dell devices with MAC addrss passthrough enabled, this driver will set NIC MAC to a predefined one. And some Dell devices have already one built-in r8152 NIC port. On these devices, when a second r8152 NIC is plugged in, a Debian originated udev rules file 73-usb-net-by-mac.rules[3] will invoke udev built-in command `net_id` to give a persistent name, and that will be based on MAC address. However, since the system has already initialized the built-in r8152 NIC with that name, renaming the second interface with this name will always fail. While Debian still carries a patch called "Revert-udev-network-device- renaming-immediately-give.patch"[4] that tries to keep support of already deprecated "75-persistent-net-generator.rules" based interface renaming mechanism, this patch also propagated into Ubuntu[5]. This patch will retry renaming with a 90 seconds timeout when the error code is -EEXIST, so the uevent processing will always be blocked in the last ifrename step in the victim system. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: udev 237-3ubuntu10.24 [modified: lib/udev/rules.d/50-firmware.rules lib/udev/rules.d/50-udev-default.rules lib/udev/rules.d/73-special-net-names.rules lib/udev/rules.d/73-usb-net-by-mac.rules] ProcVersionSignature: Ubuntu 4.15.0-1043.48-oem 4.15.18 Uname: Linux 4.15.0-1043-oem x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME CustomUdevRuleFiles: 70-snap.core.rules 95-oem-hotkey-osd.rules Date: Wed Jul 24 15:30:59 2019 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-bionic-amd64-20180608-47+beaver-jorah+X90 InstallationDate: Installed on 2019-07-03 (20 days ago) InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38 MachineType: Dell Inc. Latitude 7424 Rugged Extreme ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1043-oem.efi.signed root=UUID=5da90c85-3500-49a2-b989-71a604f9eec4 ro mem_sleep_default=deep quiet splash systemd.log_level=debug udev.log-priority=debug log_buf_len=8M vt.handoff=1 SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/27/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.5.0 dmi.board.name: 0Y7FK3 dmi.board.vendor: Dell Inc. dmi.board.version: X03 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.5.0:bd05/27/2019:svnDellInc.:pnLatitude7424RuggedExtreme:pvr:rvnDellInc.:rn0Y7FK3:rvrX03:cvnDellInc.:ct10:cvr: dmi.product.family: Latitude dmi.product.name: Latitude 7424 Rugged Extreme dmi.sys.vendor: Dell Inc. [1]: https://www.dell.com/support/article/tw/zh/twdhs1/sln301147/what-is-mac-address-pass-through?lang=en [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/usb/r8152.c [3]: https://salsa.debian.org/systemd-team/systemd/blob/master/debian/extra/rules/73-usb-net-by-mac.rules [4]: https://salsa.debian.org/systemd-team/systemd/blob/master/debian/patches/debian/Revert-udev-network-device-renaming-immediately-give.patch [5]: https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/tree/debian/patches/debian/Revert-udev-network-device-renaming-immediately-give.patch?h=ubuntu-bionic To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1843381/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
