Gateway des1
hat sich heute Morgen auf den Bart gelegt (und unser Monitoring hat es erkannt, tadaa). Ließ sich zwar noch pingen, sonst ging aber nicht mehr viel.
Es scheint so, dass er sich beim Entfernen eines Knoten eines Rot-Schwarz-Baumes auf die Nase gelegt hat, was von sysctl initiiert wurde, was von l2tp (Entfernen eines Tunnels) aufgerufen wurde. Sollte es erneut auftreten, sollten wir mal schauen, wo die Datenstruktur für den Knoten/Baum alloziert wird. Ich halte es eher für unwahrscheinlich, dass der Fehler direkt aus dem redblack-tree-Code kommt. Möglicherweise war es aber auch nur ein Seiteneffekt und es wurde einfach an ganz anderer Stelle im Kernel Speicherbereiche illegal überschrieben.
Nun denn, hier der Auszug aus dem syslog:
Jan 24 09:01:41 des1 kernel: [515812.155329] BUG: unable to handle kernel paging request at 0000000001000000
Jan 24 09:01:41 des1 kernel: [515812.155427] IP: [<ffffffffb0723379>] rb_erase+0x299/0x380
Jan 24 09:01:41 des1 kernel: [515812.155511] PGD 0
Jan 24 09:01:41 des1 kernel: [515812.155568] Oops: 0002 [#1] SMP
Jan 24 09:01:41 des1 kernel: [515812.155630] Modules linked in: binfmt_misc(E) ip_gre(E) ip_tunnel(E) gre(E) ebtable_filter(E) ebtables(E) bridge(E) stp(E) llc(E) batman_adv(E) libcrc32c(E) crc32c_generic(E) ip6table_mangle(E) ip6table_filter(E) ip6_tables(E) xt_TCPMSS(E) xt_tcpmss(E) xt_tcpudp(E) iptable_mangle(E) xt_nat(E) iptable_nat(E) nf_nat_ipv4(E) nf_nat(E) iptable_filter(E) ip_tables(E) x_tables(E) kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) jitterentropy_rng(E) hmac(E) drbg(E) ansi_cprng(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) joydev(E) evdev(E) cirrus(E) i2c_piix4(E) ppdev(E) ttm(E) parport_pc(E) drm_kms_helper(E) serio_raw(E) pcspkr(E) acpi_cpufreq(E) drm(E) parport(E) button(E) virtio_balloon(E) tpm_tis(E) tpm(E) l2tp_eth(E) l2tp_netlink(E) l2tp_core(E) ip6_udp_tunnel(E) udp_tunnel(E) nf_conntrack_netlink(E) nfnetlink(E) nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_conntrack(E) autofs4(E) hid_generic(E) usbhid(E) hid(E) ext4(E) crc16(E) jbd2(E) mbcache(E) dm_mod(E) ata_generic(E) virtio_blk(E) virtio_net(E) ata_piix(E) crc32c_intel(E) libata(E) psmouse(E) scsi_mod(E) ehci_pci(E) uhci_hcd(E) ehci_hcd(E) virtio_pci(E) usbcore(E) virtio_ring(E) virtio(E) usb_common(E) floppy(E)
Jan 24 09:01:41 des1 kernel: [515812.156791] CPU: 0 PID: 9275 Comm: python Tainted: G W E 4.7.0-0.bpo.1-amd64 #1 Debian 4.7.8-1~bpo8+1
Jan 24 09:01:41 des1 kernel: [515812.156888] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Jan 24 09:01:41 des1 kernel: [515812.156974] task: ffff880036b000c0 ti: ffff8800b9ad4000 task.ti: ffff8800b9ad4000
Jan 24 09:01:41 des1 kernel: [515812.157053] RIP: 0010:[<ffffffffb0723379>] [<ffffffffb0723379>] rb_erase+0x299/0x380
Jan 24 09:01:41 des1 kernel: [515812.157136] RSP: 0018:ffff8800b9ad7988 EFLAGS: 00010206
Jan 24 09:01:41 des1 kernel: [515812.157234] RAX: ffff8800b97e3bc8 RBX: ffff8800b9016380 RCX: ffff8800b97e3bc8
Jan 24 09:01:41 des1 kernel: [515812.157344] RDX: ffff8800b97e3bc8 RSI: ffff8800a3c53848 RDI: ffff8800b97e39e8
Jan 24 09:01:41 des1 kernel: [515812.157420] RBP: ffff8800b97e3800 R08: 0000000001000000 R09: 0000000000000000
Jan 24 09:01:41 des1 kernel: [515812.157497] R10: ffff8800b97e39c8 R11: 000000000000000c R12: ffffffffb11233c0
Jan 24 09:01:41 des1 kernel: [515812.157572] R13: ffff8800b9ad79b0 R14: ffff8800966b7000 R15: ffff8800a3ea5000
Jan 24 09:01:41 des1 kernel: [515812.157649] FS: 00007f2bf7528700(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
Jan 24 09:01:41 des1 kernel: [515812.157737] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 24 09:01:41 des1 kernel: [515812.157835] CR2: 0000000001000000 CR3: 000000013997d000 CR4: 00000000001406f0
Jan 24 09:01:41 des1 kernel: [515812.157943] Stack:
Jan 24 09:01:41 des1 kernel: [515812.158020] ffffffffb066ed5f ffff8800b97e3800 ffff8800a3c53800 ffffffffb066fae2
Jan 24 09:01:41 des1 kernel: [515812.158133] ffff8800a3ea4f28 000000002a957a6c 0000000000000286 ffff88013a70c600
Jan 24 09:01:41 des1 kernel: [515812.158258] 000000002a957a6c ffff8800a3ea52a0 ffff8800b97e3800 ffff8800a3ea5008
Jan 24 09:01:41 des1 kernel: [515812.158338] Call Trace:
Jan 24 09:01:41 des1 kernel: [515812.158404] [<ffffffffb066ed5f>] ? erase_header+0x3f/0x50
Jan 24 09:01:41 des1 kernel: [515812.158474] [<ffffffffb066fae2>] ? drop_sysctl_table+0x72/0xf0
Jan 24 09:01:41 des1 kernel: [515812.158545] [<ffffffffb066fcb8>] ? unregister_sysctl_table+0x38/0x80
Jan 24 09:01:41 des1 kernel: [515812.158627] [<ffffffffb098be7e>] ? __addrconf_sysctl_unregister.isra.42+0x1e/0x40
Jan 24 09:01:41 des1 kernel: [515812.158727] [<ffffffffb098fb9b>] ? addrconf_ifdown+0x47b/0x5a0
Jan 24 09:01:41 des1 kernel: [515812.158844] [<ffffffffb0993249>] ? addrconf_notify+0x1d9/0xb90
Jan 24 09:01:41 des1 kernel: [515812.158944] [<ffffffffb08c9612>] ? skb_dequeue+0x52/0x60
Jan 24 09:01:41 des1 kernel: [515812.159024] [<ffffffffb08e9f99>] ? pneigh_queue_purge+0x29/0x30
Jan 24 09:01:41 des1 kernel: [515812.159098] [<ffffffffb091c7da>] ? rt_flush_dev+0x3a/0xc0
Jan 24 09:01:41 des1 kernel: [515812.159179] [<ffffffffb09ba3fa>] ? ip6mr_device_event+0xaa/0xc0
Jan 24 09:01:41 des1 kernel: [515812.159298] [<ffffffffb049c895>] ? notifier_call_chain+0x45/0x70
Jan 24 09:01:41 des1 kernel: [515812.159375] [<ffffffffb08dab9f>] ? rollback_registered_many+0x1ff/0x300
Jan 24 09:01:41 des1 kernel: [515812.159451] [<ffffffffb08dacd9>] ? rollback_registered+0x39/0x60
Jan 24 09:01:41 des1 kernel: [515812.160867] [<ffffffffb08dbd00>] ? unregister_netdevice_queue+0x40/0x70
Jan 24 09:01:41 des1 kernel: [515812.162057] [<ffffffffb08dbd48>] ? unregister_netdev+0x18/0x20
Jan 24 09:01:41 des1 kernel: [515812.163204] [<ffffffffc01dd0c2>] ? l2tp_eth_delete+0x22/0x40 [l2tp_eth]
Jan 24 09:01:41 des1 kernel: [515812.164422] [<ffffffffc01d07e1>] ? l2tp_tunnel_closeall+0xb1/0x140 [l2tp_core]
Jan 24 09:01:41 des1 kernel: [515812.165527] [<ffffffffc01d0a21>] ? l2tp_udp_encap_destroy+0x31/0x60 [l2tp_core]
Jan 24 09:01:41 des1 kernel: [515812.166663] [<ffffffffb08c7ee9>] ? sk_common_release+0x19/0x110
Jan 24 09:01:41 des1 kernel: [515812.167783] [<ffffffffb09572e6>] ? inet_release+0x36/0x60
Jan 24 09:01:41 des1 kernel: [515812.168929] [<ffffffffb08c170a>] ? sock_release+0x1a/0x70
Jan 24 09:01:41 des1 kernel: [515812.169959] [<ffffffffb08c176e>] ? sock_close+0xe/0x20
Jan 24 09:01:41 des1 kernel: [515812.170956] [<ffffffffb05fbd5d>] ? __fput+0xcd/0x1e0
Jan 24 09:01:41 des1 kernel: [515812.171943] [<ffffffffb0499fa5>] ? task_work_run+0x75/0x90
Jan 24 09:01:41 des1 kernel: [515812.172894] [<ffffffffb048064e>] ? do_exit+0x39e/0xb60
Jan 24 09:01:41 des1 kernel: [515812.173860] [<ffffffffb0480e89>] ? do_group_exit+0x39/0xb0
Jan 24 09:01:41 des1 kernel: [515812.174722] [<ffffffffb048bd8b>] ? get_signal+0x2bb/0x6b0
Jan 24 09:01:41 des1 kernel: [515812.175573] [<ffffffffb042c446>] ? do_signal+0x36/0x750
Jan 24 09:01:41 des1 kernel: [515812.176456] [<ffffffffb04896da>] ? signal_wake_up_state+0x1a/0x30
Jan 24 09:01:41 des1 kernel: [515812.177256] [<ffffffffb0489e88>] ? __send_signal+0x178/0x470
Jan 24 09:01:41 des1 kernel: [515812.178034] [<ffffffffb048aa5f>] ? force_sig_info+0xbf/0xd0
Jan 24 09:01:41 des1 kernel: [515812.178812] [<ffffffffb0464a09>] ? force_sig_info_fault+0x99/0x100
Jan 24 09:01:41 des1 kernel: [515812.179501] [<ffffffffb04032e5>] ? exit_to_usermode_loop+0x85/0xc0
Jan 24 09:01:41 des1 kernel: [515812.180179] [<ffffffffb0403b01>] ? prepare_exit_to_usermode+0x21/0x30
Jan 24 09:01:41 des1 kernel: [515812.180893] [<ffffffffb09dff65>] ? retint_user+0x8/0x13
Jan 24 09:01:41 des1 kernel: [515812.181577] Code: 0f 48 89 ca 48 83 e2 fc 48 85 d2 48 89 d0 0f 84 d4 00 00 00 48 3b 7a 10 0f 84 d2 00 00 00 4c 89 42 08 4d 85 c0 0f 84 b6 00 00 00 <49> 89 08 c3 48 8b 07 48 89 01 48 83 e0 fc 0f 84 9e 00 00 00 48
Jan 24 09:01:41 des1 kernel: [515812.183074] RIP [<ffffffffb0723379>] rb_erase+0x299/0x380
Jan 24 09:01:41 des1 kernel: [515812.183779] RSP <ffff8800b9ad7988>
Jan 24 09:01:41 des1 kernel: [515812.184482] CR2: 0000000001000000
Jan 24 09:01:41 des1 kernel: [515812.187275] ---[ end trace 3b0565b1defcbe32 ]---
Jan 24 09:01:41 des1 kernel: [515812.187989] Fixing recursive fault but reboot is needed!