The first crash dumps were from my console, which was overwritten by the later boot process and therefore incomplete. Should have dug up the complete logs from the console server in the first place..
Anyways, here are the complete stack traces: [509753.194825] ixgbe 0000:02:00.0 uplink: NIC Link is Down [509753.206127] br0: port 1(uplink) entered disabled state [509813.399798] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [509813.416211] IP: [<ffffffff875b8b19>] icmp6_send+0x229/0x9f0 [509813.428016] PGD 0 [509813.432678] Oops: 0000 [#1] SMP [509813.439548] Dumping ftrace buffer: [509813.446926] (ftrace buffer empty) [509813.454651] Modules linked in: xt_set ip_set_hash_ip ip_set nfnetlink ip6t_rt nf_log_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables nfsd auth_rpcgss nfs_acl nfs lockd grace fscache sunrpc sch_tbf sit tunnel4 ip_tunnel xt_CT xt_nat ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_REDIRECT nf_nat_redirect xt_multiport nf_log_ipv4 nf_log_common xt_LOG xt_tcpudp xt_recent xt_conntrack ipt_REJECT nf_reject_ipv4 iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack 8021q garp mrp bridge stp llc nls_ascii nls_cp437 vfat fat tun nct6775 hwmon_vid fuse intel_rapl x86_pkg_temp_thermal coretemp kvm_intel ast iTCO_wdt kvm iTCO_vendor_support hci_uart ttm irqbypass pl2303 btbcm crct10dif_pclmul drm_kms_helper efi_pstore btqca evdev crc32_pclmul btintel i2c_i801 serio_raw pcspkr i2c_smbus drm ghash_clmulni_intel efivars intel_lpss_acpi ipmi_si ie31200_edac mei_me bluetooth sg usbserial edac_core intel_lpss mei ipmi_msghandler shpchp battery acpi_als tpm_tis rfkill video mfd_core kfifo_buf button acpi_power_meter tpm_tis_core industrialio tpm ext4 crc16 jbd2 fscrypto mbcache dm_mod raid1 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod xor raid6_pq libcrc32c sd_mod ahci xhci_pci crc32c_intel libahci xhci_hcd aesni_intel igb libata ixgbe aes_x86_64 i2c_algo_bit glue_helper nvme lrw dca gf128mul scsi_mod ptp ablk_helper nvme_core cryptd usbcore pps_core usb_common i2c_hid mdio thermal fan hid fjes [509813.739069] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.8.0-2-amd64 #1 Debian 4.8.11-1 [509813.755700] Hardware name: ASUSTeK COMPUTER INC. P10S-E Series/P10S-E Series, BIOS 0505 03/01/2016 [509813.774316] task: ffff9f68a88c60c0 task.stack: ffff9f68a8a8c000 [509813.786889] RIP: 0010:[<ffffffff875b8b19>] [<ffffffff875b8b19>] icmp6_send+0x229/0x9f0 [509813.803736] RSP: 0018:ffff9f68efd03aa0 EFLAGS: 00010246 [509813.815068] RAX: 0000000000000000 RBX: ffff9f68a4df7600 RCX: 0000000000000020 [509813.830064] RDX: 0000000000000001 RSI: 0000000000000200 RDI: ffff9f637b792048 [509813.845060] RBP: ffff9f68efd03bd0 R08: ffff9f68efd03bf0 R09: 0000000094b046f4 [509813.860052] R10: 0000000000000003 R11: 0000000000000000 R12: ffff9f637b792040 [509813.875030] R13: ffffffff87ada680 R14: 0000000000000000 R15: 0000000000000001 [509813.890020] FS: 0000000000000000(0000) GS:ffff9f68efd00000(0000) knlGS:0000000000000000 [509813.906976] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [509813.919172] CR2: 0000000000000018 CR3: 00000002c1e06000 CR4: 00000000003426e0 [509813.934137] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [509813.949108] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [509813.964094] Stack: [509813.968801] 0000000000000046 ffff9f68efd03b80 ffff9f68a5d4a100 ffff9f68efd03c68 [509813.984437] ffff9f68efd03bf0 0000000000000000 ffff9f637b792048 ffff9f6800000000 [509814.000072] ffff9f6800000003 ffff9f6800000001 ffff9f637b792058 ffff9f68a3eacd80 [509814.015750] Call Trace: [509814.021339] <IRQ> [509814.025406] [<ffffffff8750e7c7>] ? fib_rules_lookup+0x117/0x170 [509814.039032] [<ffffffff875d0633>] ? fib6_rule_lookup+0x53/0xc0 [509814.051394] [<ffffffff875a6b40>] ? rt6_multipath_select+0xd0/0xd0 [509814.064453] [<ffffffff875a460b>] ? rt6_lookup+0x7b/0xb0 [509814.075793] [<ffffffff875b9420>] ? ip6_err_gen_icmpv6_unreach+0x140/0x260 [509814.090315] [<ffffffff870bcb7d>] ? __wake_up_sync_key+0x3d/0x60 [509814.103001] [<ffffffffc0c3addd>] ? ipip6_err+0xbd/0x1d0 [sit] [509814.115341] [<ffffffffc0c3506d>] ? tunnel64_err+0x2d/0x40 [tunnel4] [509814.128737] [<ffffffff87561f97>] ? icmp_unreach+0xb7/0x240 [509814.140567] [<ffffffff875623bf>] ? icmp_rcv+0x26f/0x390 [509814.151908] [<ffffffff8752bf9b>] ? ip_local_deliver_finish+0x8b/0x1c0 [509814.165631] [<ffffffff8752c26b>] ? ip_local_deliver+0x6b/0xf0 [509814.177979] [<ffffffff8752bf10>] ? ip_rcv_finish+0x3e0/0x3e0 [509814.190141] [<ffffffff8752c576>] ? ip_rcv+0x286/0x3c0 [509814.201084] [<ffffffff8752bb30>] ? inet_del_offload+0x40/0x40 [ 260.181699] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 260.197481] IP: [<ffffffff8e3b8b19>] icmp6_send+0x229/0x9f0 [ 260.208708] PGD 0 [ 260.212792] Oops: 0000 [#1] SMP [ 260.219080] Dumping ftrace buffer: [ 260.225906] (ftrace buffer empty) [ 260.233059] Modules linked in: xt_set ip_set_hash_ip ip_set nfnetlink xt_CT xt_nat ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_REDIRECT nf_nat_redirect nf_log_ipv4 ipt_REJECT nf_reject_ipv4 iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables nf_nat_ftp nf_nat nf_conntrack_ftp xt_multiport ip6t_rt nf_log_ipv6 nf_log_common xt_LOG xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 xt_recent xt_conntrack nf_conntrack ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables x_tables nfsd auth_rpcgss nfs_acl nfs lockd grace fscache sunrpc sch_tbf sit tunnel4 ip_tunnel 8021q garp mrp bridge stp llc nls_ascii nls_cp437 vfat fat tun nct6775 hwmon_vid fuse intel_rapl x86_pkg_temp_thermal coretemp kvm_intel iTCO_wdt ast iTCO_vendor_support kvm hci_uart ttm btbcm btqca mei_me irqbypass ie31200_edac i2c_i801 crct10dif_pclmul btintel crc32_pclmul ipmi_si evdev efi_pstore pcspkr drm_kms_helper i2c_smbus ghash_clmulni_intel bluetooth serio_raw efivars edac_core pl2303 drm sg mei video ipmi_msghandler usbserial intel_lpss_acpi shpchp battery intel_lpss rfkill mfd_core acpi_power_meter acpi_als tpm_tis kfifo_buf button tpm_tis_core industrialio tpm ext4 crc16 jbd2 fscrypto mbcache dm_mod raid1 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx md_mod xor raid6_pq libcrc32c sd_mod ahci crc32c_intel xhci_pci libahci aesni_intel igb xhci_hcd aes_x86_64 glue_helper lrw ixgbe i2c_algo_bit nvme libata gf128mul dca ablk_helper usbcore cryptd ptp scsi_mod usb_common nvme_core pps_core i2c_hid mdio fan thermal hid fjes [ 260.511842] CPU: 5 PID: 0 Comm: swapper/5 Not tainted 4.8.0-2-amd64 #1 Debian 4.8.11-1 [ 260.527695] Hardware name: ASUSTeK COMPUTER INC. P10S-E Series/P10S-E Series, BIOS 0505 03/01/2016 [ 260.545604] task: ffff8bbde88c7000 task.stack: ffff8bbde8a94000 [ 260.557636] RIP: 0010:[<ffffffff8e3b8b19>] [<ffffffff8e3b8b19>] icmp6_send+0x229/0x9f0 [ 260.573798] RSP: 0018:ffff8bbe2fd43760 EFLAGS: 00010246 [ 260.584527] RAX: 0000000000000000 RBX: ffff8bbde5a15900 RCX: 0000000000000020 [ 260.598814] RDX: 0000000000000001 RSI: 0000000000000200 RDI: ffff8bbd4f413f86 [ 260.613077] RBP: ffff8bbe2fd43890 R08: ffff8bbe2fd438b0 R09: ffff8bbdde3c4000 [ 260.627465] R10: 0000000000000003 R11: 0000000000000000 R12: ffff8bbd4f413f7e [ 260.641731] R13: ffffffff8e8da680 R14: 0000000000000000 R15: 0000000000000001 [ 260.656014] FS: 0000000000000000(0000) GS:ffff8bbe2fd40000(0000) knlGS:0000000000000000 [ 260.672187] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 260.683848] CR2: 0000000000000018 CR3: 00000004da606000 CR4: 00000000003406e0 [ 260.698309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 260.712712] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 260.727131] Stack: [ 260.731161] 0000000000000046 ffff8bbe2fd43840 ffff8bbe2fd437d8 ffffffff8deb18bc [ 260.746065] ffff8bbe2fd438b0 0000000000000000 ffff8bbd4f413f86 ffff8bbe00000000 [ 260.760971] ffff8bbe00000003 ffff8bbe00000001 ffff8bbd4f413f96 ffff8bbde3e6b900 [ 260.775912] Call Trace: [ 260.780823] <IRQ> [ 260.784706] [<ffffffff8deb18bc>] ? enqueue_task_fair+0x5c/0x920 [ 260.797106] [<ffffffff8e30e7c7>] ? fib_rules_lookup+0x117/0x170 [ 260.809218] [<ffffffff8e3d0633>] ? fib6_rule_lookup+0x53/0xc0 [ 260.820993] [<ffffffff8e3a6b40>] ? rt6_multipath_select+0xd0/0xd0 [ 260.833402] [<ffffffff8e3a460b>] ? rt6_lookup+0x7b/0xb0 [ 260.844536] [<ffffffff8e3b9420>] ? ip6_err_gen_icmpv6_unreach+0x140/0x260 [ 260.858827] [<ffffffff8debcb7d>] ? __wake_up_sync_key+0x3d/0x60 [ 260.871357] [<ffffffffc06e3ddd>] ? ipip6_err+0xbd/0x1d0 [sit] [ 260.883664] [<ffffffffc061806d>] ? tunnel64_err+0x2d/0x40 [tunnel4] [ 260.896893] [<ffffffff8e361f97>] ? icmp_unreach+0xb7/0x240 [ 260.908531] [<ffffffff8e3623bf>] ? icmp_rcv+0x26f/0x390 [ 260.919726] [<ffffffff8e32bf9b>] ? ip_local_deliver_finish+0x8b/0x1c0 [ 260.933270] [<ffffffff8e32c26b>] ? ip_local_deliver+0x6b/0xf0 [ 260.945753] [<ffffffff8e32bf10>] ? ip_rcv_finish+0x3e0/0x3e0 [ 260.957875] [<ffffffff8e32c576>] ? ip_rcv+0x286/0x3c0 [ 260.968699] [<ffffffff8e32bb30>] ? inet_del_offload+0x40/0x40 [ 260.980871] [<ffffffff8e2ec85b>] ? __netif_receive_skb_core+0x50b/0xa50 [ 260.995081] [<ffffffff8deac12d>] ? update_cfs_rq_load_avg+0x2bd/0x4c0 [ 261.008631] [<ffffffff8e12f861>] ? strlcpy+0x31/0x40 [ 261.019267] [<ffffffff8e07d8a4>] ? kernfs_path_from_node_locked+0x284/0x320 [ 261.033829] [<ffffffff8e2ece1f>] ? netif_receive_skb_internal+0x2f/0xa0 [ 261.047835] [<ffffffffc081c52d>] ? br_pass_frame_up+0xbd/0x160 [bridge] [ 261.061648] [<ffffffff8deb127d>] ? enqueue_entity+0x2dd/0x8c0 [ 261.073820] [<ffffffffc081c7fa>] ? br_handle_frame_finish+0x22a/0x4f0 [bridge] [ 261.088971] [<ffffffffc081cc68>] ? br_handle_frame+0x168/0x300 [bridge] [ 261.102815] [<ffffffff8e3dad40>] ? packet_rcv+0x40/0x440 [ 261.113981] [<ffffffff8e2ec662>] ? __netif_receive_skb_core+0x312/0xa50 [ 261.127780] [<ffffffff8e2ece1f>] ? netif_receive_skb_internal+0x2f/0xa0 [ 261.141583] [<ffffffff8e2eddbc>] ? napi_gro_receive+0xbc/0x110 Looks like the problem is somewhere in the fib lookup code, doesn't it? Bjørn
