I've bisected Ubuntu-3.13.0-96.143 to Ubuntu3.13.0-97.144 and it looks like 7b82096b0ebc9bf487b390fe970d66ffa5a5774e introduced the problem.
thomasco@dev:/storage/ubuntu-trusty (7b82096...|BISECTING) $ git bisect bad 7b82096b0ebc9bf487b390fe970d66ffa5a5774e is the first bad commit commit 7b82096b0ebc9bf487b390fe970d66ffa5a5774e Author: Jiri Pirko <j...@resnulli.us> Date: Sat Dec 7 19:26:56 2013 +0100 neigh: restore old behaviour of default parms values commit 1d4c8c29841b9991cdf3c7cc4ba7f96a94f104ca upstream. Previously inet devices were only constructed when addresses are added. Therefore the default neigh parms values they get are the ones at the time of these operations. Now that we're creating inet devices earlier, this changes the behaviour of default neigh parms values in an incompatible way (see bug #8519). This patch creates a compromise by setting the default values at the same point as before but only for those that have not been explicitly set by the user since the inet device's creation. Introduced by: commit 8030f54499925d073a88c09f30d5d844fb1b3190 Author: Herbert Xu <herb...@gondor.apana.org.au> Date: Thu Feb 22 01:53:47 2007 +0900 [IPV4] devinet: Register inetdev earlier. Signed-off-by: Jiri Pirko <j...@resnulli.us> Signed-off-by: David S. Miller <da...@davemloft.net> BugLink: https://bugs.launchpad.net/bugs/994931 Signed-off-by: Kamal Mostafa <ka...@canonical.com> Acked-by: Tim Gardner <tim.gard...@canonical.com> Acked-by: Brad Figg <brad.f...@canonical.com> :040000 040000 b95e2490d8d94ffb3c4b5818b0ca05e2cdff17d2 7296def1ea38ae1c46ec1a6ba4df3d26fe568545 M include :040000 040000 e78478aead22c4947b2b4f816a244272613fdc08 12e3e33ddae9c141ae77b6eb471ab5b9d5214db8 M net thomasco@dev:/storage/ubuntu-trusty (7b82096...|BISECTING) $ git bisect log # bad: [002556d23100065c43d60bfdab94fedf0a30cca6] UBUNTU: Ubuntu-3.13.0-97.144 # good: [d8590fec6790ab84c56f483bef6ce0caf71a40af] UBUNTU: Ubuntu-3.13.0-96.143 git bisect start 'Ubuntu-3.13.0-97.144' 'Ubuntu-3.13.0-96.143' # good: [e5e45738175efd66844287ddcdf75e0e756fbd52] PCI: Add Netronome vendor and device IDs git bisect good e5e45738175efd66844287ddcdf75e0e756fbd52 # good: [a70a25682944ac342dae0add0a4bb4c443e93411] Revert "UBUNTU: SAUCE: (no-up) ipv6: make the net.ipv6.conf.all.use_tempaddr sysctl propagate to interface settings" git bisect good a70a25682944ac342dae0add0a4bb4c443e93411 # good: [6235189019f6136cb28646c2e637b76217a8d837] neigh: use tbl->family to distinguish ipv4 from ipv6 git bisect good 6235189019f6136cb28646c2e637b76217a8d837 # bad: [68a4a771678dd24d5eb30801d43412afb48723f5] neigh: ipv6: respect default values set before an address is assigned to device git bisect bad 68a4a771678dd24d5eb30801d43412afb48723f5 # bad: [7b82096b0ebc9bf487b390fe970d66ffa5a5774e] neigh: restore old behaviour of default parms values git bisect bad 7b82096b0ebc9bf487b390fe970d66ffa5a5774e # first bad commit: [7b82096b0ebc9bf487b390fe970d66ffa5a5774e] neigh: restore old behaviour of default parms values -- 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/1634892 Title: Setting net.ipv4.neigh.default.gc_thresh1/2/3 on 3.13.0-97.144 or later causes 'invalid argument' error Status in linux package in Ubuntu: Triaged Status in linux-lts-trusty package in Ubuntu: Triaged Bug description: Setting net.ipv4.neigh.default.gc_thresh1/2/3 on the 3.13.0-96-generic kernel and below worked fine using the following: $ sudo /sbin/sysctl -w net.ipv4.neigh.default.gc_thresh1=128 128 As of 3.13.0-97-generic, though, it no longer works as expected: $ sudo /sbin/sysctl -w net.ipv4.neigh.default.gc_thresh1=128 error: "Invalid argument" setting key "net.ipv4.neigh.default.gc_thresh1" There are two potentially related revisions in the -97 release - http://kernel.ubuntu.com/git/ubuntu/ubuntu-precise.git/commit/?h=lts- backport-trusty&id=563cf19389d8e999e69d6c94995966aeaf7c3a08 and http://kernel.ubuntu.com/git/ubuntu/ubuntu-precise.git/commit/?h=lts- backport-trusty&id=7b82096b0ebc9bf487b390fe970d66ffa5a5774e. The expected behavior is that changing neighbor table settings works using 'sysctl -w' with the same values as before the -97 kernel. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.13.0-98-generic 3.13.0-98.145~precise1 ProcVersionSignature: Ubuntu 3.13.0-98.145~precise1-generic 3.13.11-ckt39 Uname: Linux 3.13.0-98-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-98-generic. AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.0.1-0ubuntu17.13 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/midiC0D0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Error: [Errno 2] No such file or directory Card0.Amixer.values: Error: [Errno 2] No such file or directory CurrentDmesg: [ 4.586115] NET: Registered protocol family 40 Date: Wed Oct 19 06:13:36 2016 HibernationDevice: RESUME=UUID=d32abfeb-623f-4c11-ae4a-a7babe8c2139 InstallationMedia: Ubuntu-Server 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140806.1) IwConfig: Error: [Errno 2] No such file or directory MachineType: VMware, Inc. VMware Virtual Platform MarkForUpload: True ProcEnviron: LANGUAGE=en_US: TERM=screen-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-98-generic root=UUID=febea164-78c3-4d3a-a0ce-0f09990df608 ro find_preseed=/preseed.cfg noprompt quiet RelatedPackageVersions: linux-restricted-modules-3.13.0-98-generic N/A linux-backports-modules-3.13.0-98-generic N/A linux-firmware 1.79.16 RfKill: Error: [Errno 2] No such file or directory SourcePackage: linux-lts-trusty UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/02/2015 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/02/2015:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. 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