This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- zesty' to 'verification-done-zesty'. If the problem still exists, change the tag 'verification-needed-zesty' to 'verification-failed-zesty'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! -- 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/1705447 Title: misleading kernel warning skb_warn_bad_offload during checksum calculation Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: Fix Committed Status in linux source package in Zesty: Fix Committed Bug description: Even when the packet says checksum calculation is unnecessary the kernel will still check the checksum and display a warning that the checksum is bad. This has been fixed upstream in Kernel 4.11 by commit id: b2504a5dbef3305ef41988ad270b0e8ec289331c We have reports of Ubuntu 16.04 virtual machines (with ip forward enabled) displaying these warnings: [10480.074664] ------------[ cut here ]------------ [10480.074667] WARNING: CPU: 1 PID: 0 at /build/linux-hwe-X3pKE5/linux-hwe-4.8.0/net/core/dev.c:2444 skb_warn_bad_offload+0xd1/0x120 [10480.074669] docker0: caps=(0x00000400ffbb78e9, 0x0000000000000000) len=2962 data_len=2834 gso_size=1448 gso_type=5 ip_summed=1 [10480.074670] Modules linked in: veth nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace sunrpc fscache ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw glue_helper ablk_helper cryptd input_leds joydev serio_raw i2c_piix4 mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid hid virtio_scsi psmouse virtio_net pata_acpi floppy [10480.074695] CPU: 1 PID: 0 Comm: swapper/1 Tainted: P W O 4.8.0-52-generic #55~16.04.1-Ubuntu [10480.074696] Hardware name: Nutanix AHV, BIOS seabios-1.7.5-11.el6 04/01/2014 [10480.074697] 0000000000000286 ec176c2ae03bc036 ffff8beef5643870 ffffffffb7a2e7b3 [10480.074699] ffff8beef56438c0 0000000000000000 ffff8beef56438b0 ffffffffb768314b [10480.074702] 0000098cb84fba80 ffff8bed61f82000 ffff8bee9915c000 0000000000000005 [10480.074704] Call Trace: [10480.074704] <IRQ> [<ffffffffb7a2e7b3>] dump_stack+0x63/0x90 [10480.074708] [<ffffffffb768314b>] __warn+0xcb/0xf0 [10480.074710] [<ffffffffb76831cf>] warn_slowpath_fmt+0x5f/0x80 [10480.074713] [<ffffffffb7a35012>] ? ___ratelimit+0xa2/0xf0 [10480.074714] [<ffffffffb7d7c681>] skb_warn_bad_offload+0xd1/0x120 [10480.074716] [<ffffffffb7d80d58>] __skb_gso_segment+0xd8/0x140 [10480.074717] [<ffffffffb7d811af>] validate_xmit_skb+0x14f/0x2a0 [10480.074719] [<ffffffffb7d81972>] __dev_queue_xmit+0x322/0x6d0 [10480.074720] [<ffffffffc03cd746>] ? nf_nat_ipv4_fn+0x1a6/0x230 [nf_nat_ipv4] [10480.074723] [<ffffffffb7d81d30>] dev_queue_xmit+0x10/0x20 [10480.074725] [<ffffffffb7dc5272>] ip_finish_output2+0x292/0x380 [10480.074726] [<ffffffffc040223d>] ? ipv4_confirm+0x7d/0x100 [nf_conntrack_ipv4] [10480.074728] [<ffffffffb7dc60a2>] ip_finish_output+0x132/0x1d0 [10480.074729] [<ffffffffb7db9703>] ? nf_hook_slow+0x73/0xd0 [10480.074731] [<ffffffffb7dc6aee>] ip_output+0x6e/0xf0 [10480.074733] [<ffffffffb7dc5f70>] ? __ip_flush_pending_frames.isra.40+0x90/0x90 [10480.074736] [<ffffffffb7dc2883>] ip_forward_finish+0x43/0x70 [10480.074738] [<ffffffffb7dc2c34>] ip_forward+0x384/0x480 [10480.074739] [<ffffffffb7dc2840>] ? ip_frag_mem+0x50/0x50 [10480.074741] [<ffffffffb7dc085b>] ip_rcv_finish+0x11b/0x400 [10480.074743] [<ffffffffb7dc11eb>] ip_rcv+0x28b/0x3c0 [10480.074744] [<ffffffffb7dc0740>] ? inet_del_offload+0x40/0x40 [10480.074746] [<ffffffffb7d7ec44>] __netif_receive_skb_core+0x524/0xab0 [10480.074747] [<ffffffffb780aaa7>] ? kmem_cache_alloc+0xd7/0x1b0 [10480.074749] [<ffffffffb7d6f7ca>] ? __build_skb+0x2a/0xe0 [10480.074751] [<ffffffffb7d7f1e8>] __netif_receive_skb+0x18/0x60 [10480.074753] [<ffffffffb7d7f262>] netif_receive_skb_internal+0x32/0xa0 [10480.074754] [<ffffffffb7d8025d>] napi_gro_receive+0xcd/0x120 [10480.074756] [<ffffffffc0286963>] virtnet_receive+0x1c3/0x970 [virtio_net] [10480.074758] [<ffffffffb76b5e59>] ? update_cfs_rq_load_avg+0x1f9/0x4c0 [10480.074760] [<ffffffffc028712d>] virtnet_poll+0x1d/0x80 [virtio_net] [10480.074762] [<ffffffffb7d7fa68>] net_rx_action+0x238/0x380 [10480.074764] [<ffffffffb7e9d406>] __do_softirq+0xf6/0x280 [10480.074765] [<ffffffffb7688eb3>] irq_exit+0xa3/0xb0 [10480.074766] [<ffffffffb7e9d164>] do_IRQ+0x54/0xd0 [10480.074768] [<ffffffffb7e9b242>] common_interrupt+0x82/0x82 [10480.074768] <EOI> [<ffffffffb7664296>] ? native_safe_halt+0x6/0x10 [10480.074772] [<ffffffffb7637e9e>] default_idle+0x1e/0xd0 [10480.074774] [<ffffffffb763861f>] arch_cpu_idle+0xf/0x20 [10480.074775] [<ffffffffb76c7b3a>] default_idle_call+0x2a/0x40 [10480.074776] [<ffffffffb76c7e3a>] cpu_startup_entry+0x2ea/0x350 [10480.074778] [<ffffffffb76518b1>] start_secondary+0x151/0x190 [10480.074781] ---[ end trace 3a9bd18de5564b05 ]--- We have recompiled your latest 16.04.2 kernel with this patch and confirmed that this warning does not happen. Could you please consider including this fix in your next 16.04 LTS release? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1705447/+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
