So far those messages were only noticed on 2 of our hypervisor nodes. I'm attaching the relevant extracts of dmesg on those 2 machines.
** Attachment added: "multiple-dmesg.tgz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1713787/+attachment/4940943/+files/multiple-dmesg.tgz -- 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/1713787 Title: linux 4.4.0-93 triggers call traces related to the bonding module Status in linux package in Ubuntu: Confirmed Bug description: == Regression details == Since the rolled out 4.4.0-93, we are getting many ~identical call traces that look like this: ------------[ cut here ]------------ WARNING: CPU: 0 PID: XXXX at /build/linux-YyUNAI/linux-4.4.0/net/core/dev.c:2445 skb_warn_bad_offload+0xd1/0x120() bond0: caps=(0x000000000fd97ba9, 0x0000000000000000) len=1487 data_len=0 gso_size=1440 gso_type=6 ip_summed=0 Modules linked in: binfmt_misc nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables nf_log_ipv4 nf_log_common xt_LOG xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_filter ip_tables x_tables 8021q garp mrp bonding ipmi_devintf dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul ipmi_ssif crc32_pclmul bridge ghash_clmulni_intel stp llc aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd vhost_net vhost macvtap macvlan sb_edac edac_core kvm_intel kvm ipmi_si 8250_fintek ipmi_msghandler lpc_ich irqbypass shpchp mei_me mei acpi_power_meter mac_hid drbd lru_cache autofs4 btrfs xor raid6_pq bnx2x mxm_wmi vxlan ip6_udp_tunnel tg3 udp_tunnel ahci mdio ptp libcrc32c libahci megaraid_sas pps_core fjes wmi CPU: 0 PID: XXXX Comm: qemu-system-x86 Not tainted 4.4.0-93-generic #116-Ubuntu Hardware name: Dell Inc. PowerEdge R830/0VVT0H, BIOS 1.3.4 11/09/2016 0000000000000286 f5a0655ded96de87 ffff88bd7f2038c0 ffffffff813f9f83 ffff88bd7f203908 ffffffff81d6f780 ffff88bd7f2038f8 ffffffff810812f2 ffff88b6e118e000 ffff8a3d17f52000 0000000000000006 0000000000000081 Call Trace: <IRQ> [<ffffffff813f9f83>] dump_stack+0x63/0x90 [<ffffffff810812f2>] warn_slowpath_common+0x82/0xc0 [<ffffffff8108138c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffff814000a2>] ? ___ratelimit+0xa2/0xe0 [<ffffffff81735cd1>] skb_warn_bad_offload+0xd1/0x120 [<ffffffff817393dd>] __skb_gso_segment+0xfd/0x110 [<ffffffff8173971d>] validate_xmit_skb.isra.97.part.98+0x10d/0x2b0 [<ffffffff8173a352>] __dev_queue_xmit+0x582/0x590 [<ffffffff8173a370>] dev_queue_xmit+0x10/0x20 [<ffffffffc03fd848>] vlan_dev_hard_start_xmit+0x98/0x120 [8021q] [<ffffffff81739b69>] dev_hard_start_xmit+0x249/0x3d0 [<ffffffff8173a2f6>] __dev_queue_xmit+0x526/0x590 [<ffffffff8173a370>] dev_queue_xmit+0x10/0x20 [<ffffffffc05b0f2a>] br_dev_queue_push_xmit+0x7a/0x140 [bridge] [<ffffffffc05b107d>] br_forward_finish+0x3d/0xb0 [bridge] [<ffffffffc05b2860>] ? br_handle_frame_finish+0x3a0/0x620 [bridge] [<ffffffffc05b1196>] __br_forward+0xa6/0x130 [bridge] [<ffffffffc05b1727>] br_forward+0x87/0x90 [bridge] [<ffffffffc05b2860>] br_handle_frame_finish+0x3a0/0x620 [bridge] [<ffffffff817374a4>] ? __netif_receive_skb_core+0x364/0xa60 [<ffffffff81738400>] ? dev_gro_receive+0x1c0/0x3c0 [<ffffffffc05b2c54>] br_handle_frame+0x174/0x2b0 [bridge] [<ffffffffc00d73db>] ? tg3_poll_work+0x4cb/0xf10 [tg3] [<ffffffff81737bb8>] ? __netif_receive_skb+0x18/0x60 [<ffffffff817374a4>] __netif_receive_skb_core+0x364/0xa60 [<ffffffff81737e0a>] ? napi_gro_flush+0x5a/0x80 [<ffffffff81737bb8>] __netif_receive_skb+0x18/0x60 [<ffffffff817389a8>] process_backlog+0xa8/0x150 [<ffffffff817380fe>] net_rx_action+0x21e/0x360 [<ffffffff81085dd1>] __do_softirq+0x101/0x290 [<ffffffff81844f0c>] do_softirq_own_stack+0x1c/0x30 <EOI> [<ffffffff81085818>] do_softirq.part.19+0x38/0x40 [<ffffffff81085fcd>] do_softirq+0x1d/0x20 [<ffffffff817367b3>] netif_rx_ni+0x33/0x80 [<ffffffff816063e6>] tun_get_user+0x506/0x880 [<ffffffff81606827>] tun_chr_write_iter+0x57/0x70 [<ffffffff8120ecfc>] do_iter_readv_writev+0x6c/0xa0 [<ffffffff8120f87f>] do_readv_writev+0x18f/0x230 [<ffffffff8120f9a9>] vfs_writev+0x39/0x50 [<ffffffff812106d9>] SyS_writev+0x59/0xf0 [<ffffffff818431f2>] entry_SYSCALL_64_fastpath+0x16/0x71 ---[ end trace 9fe5c984ff319e6a ]--- For now this doesn't seem to have any user visible impact but we are not paying close attention to latencies/packet losses. Discovered in version: linux-image-4.4.0-93-generic 4.4.0-93.116 Last known good version: linux-image-4.4.0-92-generic 4.4.0-92.115 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-93-generic 4.4.0-93.116 ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79 Uname: Linux 4.4.0-93-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Aug 28 12:27 seq crw-rw---- 1 root audio 116, 33 Aug 28 12:27 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser' Date: Tue Aug 29 13:46:12 2017 HibernationDevice: RESUME=/dev/mapper/vghost-swap InstallationDate: Installed on 2017-04-01 (149 days ago) InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 002 Device 002: ID 8087:8002 Intel Corp. Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub Bus 001 Device 002: ID 8087:800a Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. PowerEdge R830 PciMultimedia: ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-93-generic.efi.signed root=/dev/mapper/vghost-root ro panic=300 RelatedPackageVersions: linux-restricted-modules-4.4.0-93-generic N/A linux-backports-modules-4.4.0-93-generic N/A linux-firmware 1.157.11 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/09/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.3.4 dmi.board.name: 0VVT0H dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.3.4:bd11/09/2016:svnDellInc.:pnPowerEdgeR830:pvr:rvnDellInc.:rn0VVT0H:rvrA01:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R830 dmi.sys.vendor: Dell Inc. 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