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[34.150.235.86]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6ef0f00e585sm59575546d6.27.2025.04.07.07.59.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Apr 2025 07:59:25 -0700 (PDT) Date: Mon, 07 Apr 2025 10:59:25 -0400 From: Willem de Bruijn To: Qiyu Yan , netdev@vger.kernel.org Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , netdev@vger.kernel.org Message-ID: <67f3e84d8304_38ecd3294aa@willemb.c.googlers.com.notmuch> In-Reply-To: <36566e86-57df-40f3-80ff-7833f930311d@gmail.com> References: <36566e86-57df-40f3-80ff-7833f930311d@gmail.com> Subject: Re: [bug?] "hw csum failure" warning triggered on veth interface Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Qiyu Yan wrote: > Dear linux network maintainers, > = > I'm encountering consistent |hw csum failure| warnings during system = > boot. Here's an example from a recent log (running stock kernel = > 6.14.0-63.fc42.x86_64 from Fedora 42 pre-release): > = > [=C2=A0 =C2=A074.128126] (NULL net_device): hw csum failure > [=C2=A0 =C2=A074.128149] skb len=3D545 headroom=3D98 headlen=3D545 tail= room=3D61 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mac=3D(64,14) m= ac_len=3D14 net=3D(78,20) trans=3D98 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0shinfo(txflags=3D= 0 nr_frags=3D0 gso(size=3D0 type=3D0 segs=3D0)) > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0csum(0x9edfcad = start=3D64685 offset=3D2541 ip_summed=3D2 = > complete_sw=3D0 valid=3D0 level=3D0) > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0hash(0x5c58e98 = sw=3D0 l4=3D1) proto=3D0x0800 pkttype=3D0 iif=3D3 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0priority=3D0x0 = mark=3D0x0 alloc_cpu=3D26 vlan_all=3D0x0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0encapsulation=3D= 0 inner(proto=3D0x0000, mac=3D0, net=3D0, trans=3D0) > [=C2=A0 =C2=A074.128178] skb headroom: 00000000: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128188] skb headroom: 00000010: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128197] skb headroom: 00000020: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128205] skb headroom: 00000030: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128214] skb headroom: 00000040: 72 30 8d ae 4f 32 e2 a= 4 be b5 59 = > db 08 00 45 00 > [=C2=A0 =C2=A074.128222] skb headroom: 00000050: 02 35 d2 65 40 00 33 0= 6 da 7e a3 = > 7d eb 05 0a 58 > [=C2=A0 =C2=A074.128230] skb headroom: 00000060: 00 04 > [=C2=A0 =C2=A074.128239] skb linear:=C2=A0 =C2=A000000000: e5 80 72 46 = 8c 57 20 0f af 05 eb = > 53 50 18 04 04 > [=C2=A0 =C2=A074.128247] skb linear:=C2=A0 =C2=A000000010: c3 91 00 00 = 4b 75 31 58 8e c6 71 = > 48 84 68 65 07 > [=C2=A0 =C2=A074.128255] skb linear:=C2=A0 =C2=A000000020: fe a6 6f e7 = cd 8c 64 a0 4e f6 2b = > f3 eb 61 d7 68 > [=C2=A0 =C2=A074.128263] skb linear:=C2=A0 =C2=A000000030: 8e a9 0f b6 = 67 66 be 92 c1 11 f9 = > 72 58 38 21 1e > [=C2=A0 =C2=A074.128271] skb linear:=C2=A0 =C2=A000000040: c3 93 b6 3d = 73 ec 70 46 a6 cf 56 = > e6 c2 eb 02 26 > [=C2=A0 =C2=A074.128280] skb linear:=C2=A0 =C2=A000000050: 1e 61 9c 28 = 70 15 b3 d3 8f ba e4 = > b0 7f b7 3a 43 > [=C2=A0 =C2=A074.128288] skb linear:=C2=A0 =C2=A000000060: 5f 18 6e d2 = 1c 1a 6d 31 f1 02 70 = > 01 3e b8 b8 da > [=C2=A0 =C2=A074.128296] skb linear:=C2=A0 =C2=A000000070: ed 17 c8 be = 1c ae 94 c0 90 54 e2 = > 5d 6b f0 c4 d1 > [=C2=A0 =C2=A074.128303] skb linear:=C2=A0 =C2=A000000080: 02 96 d1 e8 = 3e 9a df b3 42 a3 c6 = > 36 4d 01 67 61 > [=C2=A0 =C2=A074.128311] skb linear:=C2=A0 =C2=A000000090: e2 41 ed 42 = 27 fe 53 78 8c fa 27 = > eb ac 6d 8d ba > [=C2=A0 =C2=A074.128319] skb linear:=C2=A0 =C2=A0000000a0: 78 9c 86 75 = 92 ae 72 8d f7 bb d4 = > 08 e1 27 56 79 > [=C2=A0 =C2=A074.128327] skb linear:=C2=A0 =C2=A0000000b0: ec 2e 0d 30 = 77 bf fd ae 4d 8e e0 = > 5c 85 65 23 7c > [=C2=A0 =C2=A074.128334] skb linear:=C2=A0 =C2=A0000000c0: a6 ba 32 5f = 0f 87 f5 d8 96 56 9a = > f2 70 9b 96 de > [=C2=A0 =C2=A074.128342] skb linear:=C2=A0 =C2=A0000000d0: 51 47 e6 2f = d3 9a 9b 4a 1c 39 95 = > 17 bb 80 8f fd > [=C2=A0 =C2=A074.128349] skb linear:=C2=A0 =C2=A0000000e0: d4 19 5c 0e = 7d ce 6f 7e 67 9b a1 = > 5a c1 08 2f 76 > [=C2=A0 =C2=A074.128357] skb linear:=C2=A0 =C2=A0000000f0: 59 b6 02 a8 = 05 37 34 33 41 22 cf = > 86 19 67 d8 27 > [=C2=A0 =C2=A074.128364] skb linear:=C2=A0 =C2=A000000100: 4a e1 8c ea = a4 2a e9 66 b2 b3 70 = > a9 9d 14 2a 2b > [=C2=A0 =C2=A074.128373] skb linear:=C2=A0 =C2=A000000110: 4e a0 e9 01 = d3 3d d0 53 04 73 15 = > 10 66 c2 06 e0 > [=C2=A0 =C2=A074.128380] skb linear:=C2=A0 =C2=A000000120: 4f 39 4a 5b = 4b 44 6a 78 bf c6 90 = > 48 cc 67 8e e4 > [=C2=A0 =C2=A074.128388] skb linear:=C2=A0 =C2=A000000130: 76 30 21 a4 = 06 55 77 91 ac 51 f0 = > 1d 69 38 22 12 > [=C2=A0 =C2=A074.128396] skb linear:=C2=A0 =C2=A000000140: 2c 49 1f c9 = 3c c3 fa 9c d5 fb 87 = > 9d 16 aa 63 89 > [=C2=A0 =C2=A074.128403] skb linear:=C2=A0 =C2=A000000150: 1b 8b 34 f7 = 66 26 32 d5 83 e6 e7 = > 15 eb 72 32 a4 > [=C2=A0 =C2=A074.128411] skb linear:=C2=A0 =C2=A000000160: 2a 3a 92 9c = 3d 50 a1 ba 3e 7a df = > 12 43 85 b1 01 > [=C2=A0 =C2=A074.128418] skb linear:=C2=A0 =C2=A000000170: 83 dc aa 64 = ba 59 08 07 cf 5a 82 = > 61 b4 18 41 7e > [=C2=A0 =C2=A074.128426] skb linear:=C2=A0 =C2=A000000180: 8f 34 2c 3c = 17 93 68 ba 40 6c 1f = > 0e 1a 9f 81 36 > [=C2=A0 =C2=A074.128434] skb linear:=C2=A0 =C2=A000000190: f6 49 09 51 = cc 95 02 10 d9 d5 49 = > 67 8c d1 54 88 > [=C2=A0 =C2=A074.128442] skb linear:=C2=A0 =C2=A0000001a0: a3 5e 73 11 = 92 33 56 84 24 f9 d0 = > f9 64 a1 da 0f > [=C2=A0 =C2=A074.128449] skb linear:=C2=A0 =C2=A0000001b0: be fa db 28 = 62 83 27 d6 e9 7e c5 = > 90 3b 45 75 aa > [=C2=A0 =C2=A074.128457] skb linear:=C2=A0 =C2=A0000001c0: b0 e1 f1 84 = 75 d9 74 01 32 48 79 = > 3a e9 32 c5 74 > [=C2=A0 =C2=A074.128465] skb linear:=C2=A0 =C2=A0000001d0: 22 18 a7 50 = 45 ca 7f 42 47 7d 7d = > 44 88 1d ab cc > [=C2=A0 =C2=A074.128472] skb linear:=C2=A0 =C2=A0000001e0: fc e5 2e fb = 8a 2c c9 17 b1 82 a2 = > 3b 71 fb 49 4d > [=C2=A0 =C2=A074.128480] skb linear:=C2=A0 =C2=A0000001f0: 69 cb f6 31 = 3d 13 12 3c 3a fb f9 = > ec 3d 01 ff d6 > [=C2=A0 =C2=A074.128488] skb linear:=C2=A0 =C2=A000000200: d0 91 b1 df = 97 d5 5d af eb ce d4 = > 63 c4 a4 6e 82 > [=C2=A0 =C2=A074.128496] skb linear:=C2=A0 =C2=A000000210: dc 3a 4f 33 = 11 06 e9 ad 0b 20 c2 = > ee 20 98 77 b0 > [=C2=A0 =C2=A074.128504] skb linear:=C2=A0 =C2=A000000220: 74 > [=C2=A0 =C2=A074.128511] skb tailroom: 00000000: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128519] skb tailroom: 00000010: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128527] skb tailroom: 00000020: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 00 00 00 > [=C2=A0 =C2=A074.128534] skb tailroom: 00000030: 00 00 00 00 00 00 00 0= 0 00 00 00 = > 00 00 > [=C2=A0 =C2=A074.128545] CPU: 26 UID: 0 PID: 0 Comm: swapper/26 Tainted= : G =C2=A0 =C2=A0 =C2=A0 =C2=A0 = > =C2=A0OE=C2=A0 =C2=A0 =C2=A0-------=C2=A0 ---=C2=A0 6.14.0-63.fc42.x86= _64 #1 > [=C2=A0 =C2=A074.128554] Tainted: [O]=3DOOT_MODULE, [E]=3DUNSIGNED_MODU= LE > [=C2=A0 =C2=A074.128557] Hardware name: To Be Filled By O.E.M. To Be Fi= lled By = > O.E.M./EPYCD8, BIOS L2.52 11/25/2020 > [=C2=A0 =C2=A074.128562] Call Trace: > [=C2=A0 =C2=A074.128567]=C2=A0 > [=C2=A0 =C2=A074.128579]=C2=A0 dump_stack_lvl+0x5d/0x80 > [=C2=A0 =C2=A074.128594]=C2=A0 __skb_checksum_complete+0xe8/0x100 > [=C2=A0 =C2=A074.128605]=C2=A0 ? __pfx_csum_partial_ext+0x10/0x10 > [=C2=A0 =C2=A074.128611]=C2=A0 ? __pfx_csum_block_add_ext+0x10/0x10 > [=C2=A0 =C2=A074.128620]=C2=A0 tcp_rcv_established+0x4da/0x770 > [=C2=A0 =C2=A074.128634]=C2=A0 tcp_v4_do_rcv+0x165/0x2b0 > [=C2=A0 =C2=A074.128643]=C2=A0 tcp_v4_rcv+0xc72/0xf40 > [=C2=A0 =C2=A074.128655]=C2=A0 ip_protocol_deliver_rcu+0x33/0x190 > [=C2=A0 =C2=A074.128664]=C2=A0 ip_local_deliver_finish+0x76/0xa0 > [=C2=A0 =C2=A074.128671]=C2=A0 ip_local_deliver+0xf6/0x100 > [=C2=A0 =C2=A074.128682]=C2=A0 __netif_receive_skb_one_core+0x87/0xa0 > [=C2=A0 =C2=A074.128693]=C2=A0 process_backlog+0x87/0x130 > [=C2=A0 =C2=A074.128703]=C2=A0 __napi_poll+0x2b/0x160 > [=C2=A0 =C2=A074.128713]=C2=A0 net_rx_action+0x333/0x420 > [=C2=A0 =C2=A074.128737]=C2=A0 handle_softirqs+0xf2/0x340 > [=C2=A0 =C2=A074.128747]=C2=A0 ? srso_return_thunk+0x5/0x5f > [=C2=A0 =C2=A074.128760]=C2=A0 __irq_exit_rcu+0xc2/0xe0 > [=C2=A0 =C2=A074.128768]=C2=A0 common_interrupt+0x85/0xa0 > [=C2=A0 =C2=A074.128777]=C2=A0 > [=C2=A0 =C2=A074.128779]=C2=A0 > [=C2=A0 =C2=A074.128783]=C2=A0 asm_common_interrupt+0x26/0x40 > [=C2=A0 =C2=A074.128792] RIP: 0010:cpuidle_enter_state+0xcc/0x660 > [=C2=A0 =C2=A074.128799] Code: 00 00 e8 d7 23 00 ff e8 62 ee ff ff 49 8= 9 c4 0f 1f = > 44 00 00 31 ff e8 03 6c fe fe 45 84 ff 0f 85 02 02 00 00 fb 0f 1f 44 00= = > 00 <85> ed 0f 88 d3 01 00 00 4c 63 f5 49 83 fe 0a 0f 83 9f 04 00 00 49 > [=C2=A0 =C2=A074.128803] RSP: 0018:ffffb8bd003dfe58 EFLAGS: 00000246 > [=C2=A0 =C2=A074.128809] RAX: ffff9ecb4cd00000 RBX: ffff9eac82e5a800 RC= X: = > 0000000000000000 > [=C2=A0 =C2=A074.128813] RDX: 00000011426107f1 RSI: 000000003152c088 RD= I: = > 0000000000000000 > [=C2=A0 =C2=A074.128817] RBP: 0000000000000002 R08: 00000000000d5a5c R0= 9: = > 0000000000000001 > [=C2=A0 =C2=A074.128820] R10: 0000000000000003 R11: ffff9ecb4cd217c0 R1= 2: = > 00000011426107f1 > [=C2=A0 =C2=A074.128823] R13: ffffffffb8b15140 R14: 0000000000000002 R1= 5: = > 0000000000000000 > [=C2=A0 =C2=A074.128841]=C2=A0 ? cpuidle_enter_state+0xbd/0x660 > [=C2=A0 =C2=A074.128853]=C2=A0 cpuidle_enter+0x2d/0x40 > [=C2=A0 =C2=A074.128864]=C2=A0 cpuidle_idle_call+0xf2/0x160 > [=C2=A0 =C2=A074.128875]=C2=A0 do_idle+0x78/0xd0 > [=C2=A0 =C2=A074.128883]=C2=A0 cpu_startup_entry+0x29/0x30 > [=C2=A0 =C2=A074.128890]=C2=A0 start_secondary+0x12d/0x160 > [=C2=A0 =C2=A074.128901]=C2=A0 common_startup_64+0x13e/0x141 > [=C2=A0 =C2=A074.128918]=C2=A0 > = > What caught my attention is that iif=3D3 points to an interface that is= = > not connected to the outside and, as far as I can tell, should not be a= = > source of any errors. > = > Through testing, I've observed the following: > = > 1. Disabling all Podman containers eliminates the warning. > 2. Disabling only containers using macvlan/ipvlan (while leaving other= s > running) still triggers the warning. > 3. Booting with a limited number of containers also reproduces the > warning =E2=80=94 the example above was captured in such a scenario= . > = > The skb dump includes this line: > = > skb headroom: 00000040: 72 30 8d ae 4f 32 e2 a4 be b5 59 db 08 00 45 00= > = > This appears to show the MAC address of the skb, which I was able to = > trace to: > $ sudo podman exec -it systemd-qbittorrentEH ip a > [... unrelated ...] > 3: eth0@if12: mtu 1500 qdisc = > noqueue state UP qlen 1000 > =C2=A0 =C2=A0 link/ether 72:30:8d:ae:4f:32 brd ff:ff:ff:ff:ff:ff > =C2=A0 =C2=A0 inet 10.88.0.4/16 brd 10.88.255.255 scope global eth0 > =C2=A0 =C2=A0 =C2=A0 =C2=A0valid_lft forever preferred_lft forever > =C2=A0 =C2=A0 inet6 fccc::4/64 scope global > =C2=A0 =C2=A0 =C2=A0 =C2=A0valid_lft forever preferred_lft forever > =C2=A0 =C2=A0 inet6 fe80::7030:8dff:feae:4f32/64 scope link > =C2=A0 =C2=A0 =C2=A0 =C2=A0valid_lft forever preferred_lft forever > And the other MAC: > $ ip link show podman0 > 9: podman0: mtu 1500 qdisc noqueue = > state UP mode DEFAULT group default qlen 1000 > =C2=A0 =C2=A0 link/ether e2:a4:be:b5:59:db brd ff:ff:ff:ff:ff:ff > = > This seems to suggest the warning involves traffic between a veth pair = > used by containers, raising the possibility of a bug in the kernel. Can this be a packet coming in over the physical NIC, forwarded through veth to the container. Either using ip_forward or some redirect. Do packets arrive encapsulated in a tunnel and what does the decapsulation? > For completeness, here is NIC information from the system (2x ConnectX-= 4 = > MCX4121A-ACAT): > $ ethtool -i mlx-p0 > driver: mlx5_core > version: 6.14.0-63.fc42.x86_64 > firmware-version: 14.32.1900 (MT_2420110034) > expansion-rom-version: > bus-info: 0000:c1:00.0 > supports-statistics: yes > supports-test: yes > supports-eeprom-access: no > supports-register-dump: no > supports-priv-flags: yes > = > (and 2 unplugged i350 ports) > $ ethtool -i board-p0 > driver: igb > version: 6.14.0-63.fc42.x86_64 > firmware-version: 1.69, 0x80000df4 > expansion-rom-version: > bus-info: 0000:45:00.0 > supports-statistics: yes > supports-test: yes > supports-eeprom-access: yes > supports-register-dump: yes > supports-priv-flags: yes > = > Please let me know if further debugging or logs would be helpful. I'd b= e = > happy to provide more detail or try any suggested patches. > = > Best, > Qiyu