WARNING: CPU: 3 PID: 0 at include/net/netfilter/nf_conntrack.h:175 ovs_ct_clear+0x51/0x60 [openvswitch]

[Ed Symanzik]

I get the following in syslog once per second.

Jun 29 18:08:14 server kernel: [86579.686063] ------------[ cut here ]------------
Jun 29 18:08:14 server kernel: [86579.686100] WARNING: CPU: 3 PID: 0 at include/net/netfilter/nf_conntrack.h:175 ovs_ct_clear+0x51/0x60 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.686141] Modules linked in: nf_conntrack_netlink iptable_nat xt_MASQUERADE nfnetlink_cttimeout nfnetlink bpfilter nvidia_uvm(PO) nls_iso8859_1 nvidia_drm(PO) nvidia_modeset(PO) nvidia(PO) sch_fq_codel intel_rapl_msr intel_rapl_common vhost_vsock vmw_vsock_virtio_transport_common vsock vhost_scsi vhost_net tap x86_pkg_temp_thermal intel_powerclamp mei_hdcp ppdev vhost vhost_iotlb snd_hda_codec_realtek coretemp snd_hda_codec_generic target_core_mod ledtrig_audio snd_hda_codec_hdmi snd_hda_intel rapl snd_intel_dspcfg snd_intel_sdw_acpi pci_stub joydev snd_soc_rt5640 snd_soc_rl6231 intel_cstate snd_soc_core snd_hda_codec snd_compress input_leds at24 ac97_bus snd_hda_core mei_me snd_pcm_dmaengine snd_hwdep snd_pcm mei snd_timer openvswitch parport_pc snd parport mac_hid soundcore nsh nf_conncount nf_nat efi_pstore acpi_pad nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nbd kvm_intel kvm iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi iptable_filter ip6table_filter ip6_tables dm_thin_pool
Jun 29 18:08:14 server kernel: [86579.686559] dm_persistent_data dm_bio_prison dm_snapshot dm_bufio br_netfilter bridge stp llc dm_multipath arp_tables scsi_dh_rdac ipmi_devintf scsi_dh_emc scsi_dh_alua ipmi_msghandler msr ip_tables x_tables autofs4 btrfs blake2b_generic zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 hid_generic i2c_algo_bit ttm usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd drm_kms_helper cryptd syscopyarea sysfillrect sysimgblt fb_sys_fops cec ahci rc_core i2c_i801 i2c_smbus libahci r8169 lpc_ich drm realtek xhci_pci xhci_pci_renesas video
Jun 29 18:08:14 server kernel: [86579.687003] CPU: 3 PID: 0 Comm: swapper/3 Tainted: P W O 5.15.0-40-generic #43-Ubuntu
Jun 29 18:08:14 server kernel: [86579.687013] Hardware name: Gigabyte Technology Co., Ltd. H97M-D3H/H97M-D3H, BIOS F4 06/28/2014
Jun 29 18:08:14 server kernel: [86579.687020] RIP: 0010:ovs_ct_clear+0x51/0x60 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687052] Code: 04 4c 89 e7 31 c9 31 f6 48 c7 43 68 07 00 00 00 48 c7 c2 a0 ca f3 ac e8 2d ed ff ff 31 c0 5b 41 5c 5d c3 e8 71 f1 88 eb eb d0 <0f> 0b eb cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 8d 56
Jun 29 18:08:14 server kernel: [86579.687062] RSP: 0018:ffffc04200170878 EFLAGS: 00010246
Jun 29 18:08:14 server kernel: [86579.687073] RAX: 0000000000000010 RBX: ffffa0b315b91200 RCX: ffffc042001707d0
Jun 29 18:08:14 server kernel: [86579.687080] RDX: 0000000000000000 RSI: ffffc04200170aa0 RDI: 0000000000000000
Jun 29 18:08:14 server kernel: [86579.687088] RBP: ffffc04200170888 R08: 0000000000000000 R09: ffffa0b417b28800
Jun 29 18:08:14 server kernel: [86579.687094] R10: ffffc04200170aa0 R11: ffffc04200170a30 R12: ffffc04200170aa0
Jun 29 18:08:14 server kernel: [86579.687101] R13: ffffa0b410bd6a80 R14: ffffa0b315b91200 R15: 0000000000000004
Jun 29 18:08:14 server kernel: [86579.687108] FS: 0000000000000000(0000) GS:ffffa0b526b80000(0000) knlGS:0000000000000000
Jun 29 18:08:14 server kernel: [86579.687116] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 29 18:08:14 server kernel: [86579.687123] CR2: 00007f48327a3b70 CR3: 0000000194c10002 CR4: 00000000001706e0
Jun 29 18:08:14 server kernel: [86579.687132] Call Trace:
Jun 29 18:08:14 server kernel: [86579.687138] <IRQ>
Jun 29 18:08:14 server kernel: [86579.687146] do_execute_actions+0x820/0xa90 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687171] ? flow_lookup.constprop.0+0x5c/0x100 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687201] ovs_execute_actions+0x4c/0x110 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687224] ovs_dp_process_packet+0x9d/0x1e0 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687248] ? ovs_ct_update_key.isra.0+0xa4/0x110 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687276] ? ovs_ct_fill_key+0x1d/0x20 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687298] ? ovs_flow_key_extract+0x2d3/0x340 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687324] ovs_vport_receive+0x77/0xd0 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687351] ? xmit_one.constprop.0+0x9c/0x160
Jun 29 18:08:14 server kernel: [86579.687363] ? dev_hard_start_xmit+0x45/0x90
Jun 29 18:08:14 server kernel: [86579.687372] ? __dev_queue_xmit+0x2ad/0x510
Jun 29 18:08:14 server kernel: [86579.687383] ? dev_queue_xmit+0x10/0x20
Jun 29 18:08:14 server kernel: [86579.687392] ? ip_finish_output2+0x1a2/0x580
Jun 29 18:08:14 server kernel: [86579.687414] netdev_port_receive+0xc0/0x170 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687442] ? netdev_port_receive+0x170/0x170 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687467] netdev_frame_hook+0x1f/0x30 [openvswitch]
Jun 29 18:08:14 server kernel: [86579.687493] __netif_receive_skb_core.constprop.0+0x236/0xef0
Jun 29 18:08:14 server kernel: [86579.687505] ? csum_block_add_ext+0x20/0x20
Jun 29 18:08:14 server kernel: [86579.687515] ? kmap_atomic+0x30/0x30
Jun 29 18:08:14 server kernel: [86579.687523] ? __skb_gro_checksum_complete+0x22/0x90
Jun 29 18:08:14 server kernel: [86579.687542] __netif_receive_skb_list_core+0xf5/0x240
Jun 29 18:08:14 server kernel: [86579.687554] netif_receive_skb_list_internal+0x18e/0x2a0
Jun 29 18:08:14 server kernel: [86579.687564] ? napi_gro_receive+0x70/0x1f0
Jun 29 18:08:14 server kernel: [86579.687574] napi_complete_done+0x7a/0x1b0
Jun 29 18:08:14 server kernel: [86579.687587] rtl8169_poll+0x54/0x80 [r8169]
Jun 29 18:08:14 server kernel: [86579.687603] __napi_poll+0x33/0x180
Jun 29 18:08:14 server kernel: [86579.687613] net_rx_action+0x126/0x280
Jun 29 18:08:14 server kernel: [86579.687626] __do_softirq+0xd9/0x2e3
Jun 29 18:08:14 server kernel: [86579.687637] irq_exit_rcu+0x8c/0xb0
Jun 29 18:08:14 server kernel: [86579.687656] common_interrupt+0x8a/0xa0
Jun 29 18:08:14 server kernel: [86579.687667] </IRQ>
Jun 29 18:08:14 server kernel: [86579.687672] <TASK>
Jun 29 18:08:14 server kernel: [86579.687677] asm_common_interrupt+0x1e/0x40
Jun 29 18:08:14 server kernel: [86579.687692] RIP: 0010:cpuidle_enter_state+0xd9/0x620
Jun 29 18:08:14 server kernel: [86579.687707] Code: 3d 64 01 9e 53 e8 d7 62 6c ff 49 89 c7 0f 1f 44 00 00 31 ff e8 28 6f 6c ff 80 7d d0 00 0f 85 5d 01 00 00 fb 66 0f 1f 44 00 00 <45> 85 f6 0f 88 69 01 00 00 4d 63 ee 49 83 fd 09 0f 87 e3 03 00 00
Jun 29 18:08:14 server kernel: [86579.687715] RSP: 0018:ffffc042000cbe28 EFLAGS: 00000246
Jun 29 18:08:14 server kernel: [86579.687726] RAX: ffffa0b526bb0b00 RBX: ffffe041ffd80030 RCX: 0000000000000000
Jun 29 18:08:14 server kernel: [86579.687732] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
Jun 29 18:08:14 server kernel: [86579.687738] RBP: ffffc042000cbe78 R08: 00004ebe676d5d5b R09: 0000000000000000
Jun 29 18:08:14 server kernel: [86579.687745] R10: 0000000000000001 R11: fffffffffffffffe R12: ffffffffadcd3a20
Jun 29 18:08:14 server kernel: [86579.687751] R13: 0000000000000005 R14: 0000000000000005 R15: 00004ebe676d5d5b
Jun 29 18:08:14 server kernel: [86579.687761] ? cpuidle_enter_state+0xc8/0x620
Jun 29 18:08:14 server kernel: [86579.687774] cpuidle_enter+0x2e/0x40
Jun 29 18:08:14 server kernel: [86579.687789] cpuidle_idle_call+0x13e/0x1e0
Jun 29 18:08:14 server kernel: [86579.687801] do_idle+0x83/0xf0
Jun 29 18:08:14 server kernel: [86579.687810] cpu_startup_entry+0x20/0x30
Jun 29 18:08:14 server kernel: [86579.687818] start_secondary+0x12a/0x180
Jun 29 18:08:14 server kernel: [86579.687829] secondary_startup_64_no_verify+0xc2/0xcb
Jun 29 18:08:14 server kernel: [86579.687843] </TASK>
Jun 29 18:08:14 server kernel: [86579.687848] ---[ end trace dceac74221885e36 ]---