On machines serving mainly http traffic we are seeing the following panic, which is not yet reproducible.
[180926.566743] ------------[ cut here ]------------ [180926.572034] kernel BUG at net/netfilter/nf_conntrack_core.c:220! [180926.578873] invalid opcode: 0000 [#1] SMP [180926.583594] Modules linked in: xfs exportfs ipmi_devintf ipmi_si ipmi_msghandler dm_mod md_mod nf_conntr ack_ipv6 nf_defrag_ipv6 ip6table_filter ip6table_raw ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp x t_conntrack xt_multiport iptable_filter xt_NOTRACK nf_conntrack iptable_raw ip_tables x_tables nfsv4 auth_rp cgss fuse nfsv3 nfs_acl nfs fscache lockd sunrpc sfc mtd i2c_algo_bit i2c_core mdio igb dca uhci_hcd coretem p acpi_cpufreq kvm_intel kvm crc32c_intel aesni_intel ablk_helper cryptd aes_x86_64 aes_generic evdev sd_mod crc_t10dif mperf snd_pcm ahci snd_timer tpm_tis microcode snd tpm libahci tpm_bios soundcore libata snd_pag e_alloc pcspkr ehci_hcd lpc_ich usbcore mfd_core hpsa scsi_mod usb_common button processor thermal_sys [180926.657762] CPU 12 [180926.660008] Pid: 5948, comm: nginx-fl Not tainted 3.6.0-cloudflare #1 HP ProLiant DL180 G6 [180926.669820] RIP: 0010:[<ffffffffa02ccdd1>] [<ffffffffa02ccdd1>] destroy_conntrack+0x55/0xa9 [nf_conntrack] [180926.680871] RSP: 0018:ffff8805bd73fbb8 EFLAGS: 00010246 [180926.686930] RAX: 0000000000000000 RBX: ffff8806b6f56c30 RCX: ffff8805bd73fc48 [180926.695055] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8806b6f56c30 [180926.703179] RBP: ffffffff81651780 R08: 00000000000172e0 R09: ffffffff812cef91 [180926.711304] R10: dead000000200200 R11: dead000000100100 R12: ffff8806b6f56c30 [180926.727451] R13: 0000000000000000 R14: ffffffffa02d6030 R15: 0000000000000000 [180926.735575] FS: 00007f382cdb2710(0000) GS:ffff880627cc0000(0000) knlGS:0000000000000000 [180926.744766] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [180926.751312] CR2: ffffffffff600400 CR3: 00000005bd8d3000 CR4: 00000000000007e0 [180926.759436] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [180926.767560] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [180926.775686] Process nginx-fl (pid: 5948, threadinfo ffff8805bd73e000, task ffff8805c9755960) [180926.785265] Stack: [180926.787634] 0000000000000000 ffffffff81651780 ffff8802720c2900 ffffffffa02cde78 [180926.796087] ffffffff81651ec0 ffffffffa02d6030 00000000bff0efab ffff8805ffffffff [180926.804532] 0002880500000002 0000000300000014 0000001400000003 06ff880600000002 [180926.812985] Call Trace: [180926.815845] [<ffffffffa02cde78>] ? nf_conntrack_in+0x4ed/0x5bc [nf_conntrack] [180926.824069] [<ffffffff812ac195>] ? nf_iterate+0x41/0x77 [180926.830131] [<ffffffff812b3820>] ? ip_options_echo+0x2ed/0x2ed [180926.836873] [<ffffffff812ac2ee>] ? nf_hook_slow+0x68/0xfd [180926.843127] [<ffffffff812b3820>] ? ip_options_echo+0x2ed/0x2ed [180926.849866] [<ffffffff812b55a8>] ? __ip_local_out+0x98/0x9d [180926.856315] [<ffffffff812b55b6>] ? ip_local_out+0x9/0x19 [180926.862465] [<ffffffff812c7582>] ? tcp_transmit_skb+0x7ae/0x7f1 [180926.869305] [<ffffffff810fff4c>] ? virt_to_head_page+0x9/0x2c [180926.875949] [<ffffffff812c78a6>] ? tcp_send_active_reset+0xd5/0x101 [180926.883175] [<ffffffff812bc38f>] ? tcp_close+0x118/0x354 [180926.889334] [<ffffffff812dbdc2>] ? inet_release+0x75/0x7b [180926.895591] [<ffffffff81278bff>] ? sock_release+0x19/0x73 [180926.901845] [<ffffffff81278c7b>] ? sock_close+0x22/0x27 [180926.907906] [<ffffffff81109de8>] ? __fput+0xe9/0x1ae [180926.913677] [<ffffffff81057157>] ? task_work_run+0x53/0x67 [180926.920031] [<ffffffff8100e50c>] ? do_notify_resume+0x79/0x8d [180926.926673] [<ffffffff8134e5b2>] ? int_signal+0x12/0x17 [180926.932732] Code: 05 48 89 df ff d0 48 c7 c7 30 66 2d a0 e8 11 b0 07 e1 48 89 df e8 72 25 00 00 48 8b 43 78 a8 08 75 2a 48 8b 53 10 48 85 d2 75 04 <0f> 0b eb fe 48 8b 43 08 48 89 02 a8 01 75 04 48 89 50 08 48 be [180926.954788] RIP [<ffffffffa02ccdd1>] destroy_conntrack+0x55/0xa9 [nf_conntrack] [180926.963217] RSP <ffff8805bd73fbb8> [180926.967700] ---[ end trace 54a660a52afd5820 ]--- [180926.973038] Kernel panic - not syncing: Fatal exception in interrupt --- Ian Applegate CloudFlare -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/