Recentemente, atualizei meu servidor doméstico do Ubuntu 10.04 para 12.04.1. Ele roda o kernel linux-image-server, x86_64 arch.
Acho que não há nada particularmente incomum em executar - um daemon de dilúvio, apache2, firewall iptables com mascaramento de IP, servidor DHCP, servidor DNS de ligação que possui arquivos de zona atualizados automaticamente com os nomes de host que os clientes DHCP identificam-se com, sshd, nfs server, um punhado de outras coisas. Esta máquina é o meu roteador - fica entre a Internet e a rede local.
Desde a atualização, ele falhou intermitentemente. Ficará bom por um tempo após a inicialização e, de repente, perderemos nossas conexões de rede no wifi. Se eu conectar um cabo de rede, não consigo obter um endereço IP do servidor DHCP. Se eu definir um endereço IP estático, posso continuar acessando a Internet sem problemas. Isso faz com que pareça que é o servidor DHCP que falha (na verdade, eu corro dhclient -v eth0
e nada responde aos gritos do dhcpdiscover), notado quando os clientes tentam renovar suas concessões de IP. Mas, com um IP estático, ainda posso acessar a Internet, então o iptables ainda está funcionando bem.
Por isso, tento fazer login na máquina pelo SSH, mas parece travar. Se eu tornar o ssh detalhado, vejo que ele estabelece uma conexão com o servidor, então falha um pouco mais adiante - difícil ver exatamente onde.
Observo que, se eu tentar pegar uma página da Web em seu servidor HTTP, recebo a página solicitada, mas quaisquer solicitações extras feitas (para imagens, folhas de estilo, javascripts) não são atendidas. No entanto, posso obter esses arquivos se solicitá-los diretamente, por exemplo, do curl.
Isso está sugerindo que as coisas estão indo ladeira abaixo sempre que algo tenta bifurcar-se?
Arrastei um monitor e um teclado para o servidor (geralmente sem cabeça) e dei uma olhada - vejo vestígios de pilha.
Mudo para um novo terminal virtual e tento efetuar login. Recebo um rastreamento de pilha (falha geral de proteção) depois de inserir minha senha. Aqui está:
Jan 6 20:19:54 localhost kernel: [ 1475.178245] general protection fault: 0000 [#12] SMP
Jan 6 20:19:54 localhost kernel: [ 1475.178292] CPU 1
Jan 6 20:19:54 localhost kernel: [ 1475.178309] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs ext2 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc dm_crypt ppdev ipt_REJECT ipt_LOG ipt_MASQUERADE xt_state iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables joydev sp5100_tco edac_core i2c_piix4 serio_raw k8temp edac_mce_amd snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore parport_pc snd_page_alloc mac_hid shpchp lp parport radeon 8139too ttm drm_kms_helper drm pata_atiixp i2c_algo_bit usbhid hid wmi r8169
Jan 6 20:19:54 localhost kernel: [ 1475.178911]
Jan 6 20:19:54 localhost kernel: [ 1475.178927] Pid: 1305, comm: login Tainted: G B D 3.2.0-35-generic #55-Ubuntu Gigabyte Technology Co., Ltd. GA-MA785GM-US2H/GA-MA785GM-US2H
Jan 6 20:19:54 localhost kernel: [ 1475.179028] RIP: 0010:[<ffffffff8116589a>] [<ffffffff8116589a>] kmem_cache_alloc+0x5a/0x140
Jan 6 20:19:54 localhost kernel: [ 1475.179096] RSP: 0018:ffff88006b251d78 EFLAGS: 00010206
Jan 6 20:19:54 localhost kernel: [ 1475.179135] RAX: 0000000000000000 RBX: 00007f062bb91000 RCX: 000000000005b2ed
Jan 6 20:19:54 localhost kernel: [ 1475.179186] RDX: 000000000005b2ec RSI: 0000000000016da0 RDI: ffff88006d408a00
Jan 6 20:19:54 localhost kernel: [ 1475.179236] RBP: ffff88006b251dc8 R08: ffff88006fa96da0 R09: 0000000000000001
Jan 6 20:19:54 localhost kernel: [ 1475.179287] R10: 00000000000000d1 R11: ffff88006b23a8f0 R12: ffff88006d408a00
Jan 6 20:19:54 localhost kernel: [ 1475.179336] R13: 2665c4979a04b7b8 R14: ffffffff811447c5 R15: 00000000000080d0
Jan 6 20:19:54 localhost kernel: [ 1475.179387] FS: 00007f062bb81700(0000) GS:ffff88006fa80000(0000) knlGS:0000000000000000
Jan 6 20:19:54 localhost kernel: [ 1475.179445] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 6 20:19:54 localhost kernel: [ 1475.179486] CR2: 00007f9b4d79da00 CR3: 0000000059a34000 CR4: 00000000000006e0
Jan 6 20:19:54 localhost kernel: [ 1475.179536] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 6 20:19:54 localhost kernel: [ 1475.179586] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jan 6 20:19:54 localhost kernel: [ 1475.179637] Process login (pid: 1305, threadinfo ffff88006b250000, task ffff880036058000)
Jan 6 20:19:54 localhost kernel: [ 1475.179695] Stack:
Jan 6 20:19:54 localhost kernel: [ 1475.179711] ffff880036058000 0000000000000041 0000000000000001 ffffffff81188cec
Jan 6 20:19:54 localhost kernel: [ 1475.179777] 0000000000000282 00007f062bb91000 ffff88006822ce00 0000000000000001
Jan 6 20:19:54 localhost kernel: [ 1475.179841] 0000000000001000 0000000000000000 ffff88006b251e88 ffffffff811447c5
Jan 6 20:19:54 localhost kernel: [ 1475.179905] Call Trace:
Jan 6 20:19:54 localhost kernel: [ 1475.179928] [<ffffffff81188cec>] ? path_openat+0xfc/0x3f0
Jan 6 20:19:54 localhost kernel: [ 1475.179971] [<ffffffff811447c5>] mmap_region+0x2a5/0x4f0
Jan 6 20:19:54 localhost kernel: [ 1475.180012] [<ffffffff81144d58>] do_mmap_pgoff+0x348/0x360
Jan 6 20:19:54 localhost kernel: [ 1475.180054] [<ffffffff81144e36>] sys_mmap_pgoff+0xc6/0x230
Jan 6 20:19:54 localhost kernel: [ 1475.180098] [<ffffffff81018b12>] sys_mmap+0x22/0x30
Jan 6 20:19:54 localhost kernel: [ 1475.180136] [<ffffffff816655c2>] system_call_fastpath+0x16/0x1b
Jan 6 20:19:54 localhost kernel: [ 1475.180180] Code: 00 4d 8b 04 24 65 4c 03 04 25 50 da 00 00 49 8b 50 08 4d 8b 28 4d 85 ed 0f 84 d8 00 00 00 49 63 44 24 20 49 8b 34 24 48 8d 4a 01 <49> 8b 5c 05 00 4c 89 e8 65 48 0f c7 0e 0f 94 c0 84 c0 74 c2 4d
Jan 6 20:19:54 localhost kernel: [ 1475.180503] RIP [<ffffffff8116589a>] kmem_cache_alloc+0x5a/0x140
Jan 6 20:19:54 localhost kernel: [ 1475.180552] RSP <ffff88006b251d78>
Jan 6 20:19:54 localhost kernel: [ 1475.180603] ---[ end trace 766ef1ef52f774b9 ]---
Se eu assistir por tempo suficiente, vejo falhas de proteção mais gerais. Eu vi-os para login
, apache2
, deluge-web
, head
, powerbtn.sh
até o momento.
Preciso redefinir a máquina com força para voltar ao estado de funcionamento (até recebo uma falha de proteção geral powerbtn.sh
ao pressionar o botão liga / desliga), mas não demora muito para que ela fique assim novamente.
Ainda não descobri como reproduzir isso sob demanda - parece acontecer aleatoriamente.
Caso seja útil, examinei o kern.log e encontrei a primeira falha desse tipo. Há uma tonelada de todos eles em uma linha começando com zsh
, então deluged
, apache2
, cron
, head
, console-kit-dae
, irqbalance
, nmbd
... Aqui está o zsh
um e o erro mau estado página que vem logo depois:
Jan 6 20:13:35 localhost kernel: [ 1096.184250] general protection fault: 0000 [#1] SMP
Jan 6 20:13:35 localhost kernel: [ 1096.186339] CPU 1
Jan 6 20:13:35 localhost kernel: [ 1096.186355] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs ext2 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc dm_crypt ppdev ipt_REJECT ipt_LOG ipt_MASQUERADE xt_state iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables joydev sp5100_tco edac_core i2c_piix4 serio_raw k8temp edac_mce_amd snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore parport_pc snd_page_alloc mac_hid shpchp lp parport radeon 8139too ttm drm_kms_helper drm pata_atiixp i2c_algo_bit usbhid hid wmi r8169
Jan 6 20:13:35 localhost kernel: [ 1096.188008]
Jan 6 20:13:35 localhost kernel: [ 1096.188008] Pid: 2564, comm: zsh Not tainted 3.2.0-35-generic #55-Ubuntu Gigabyte Technology Co., Ltd. GA-MA785GM-US2H/GA-MA785GM-US2H
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RIP: 0010:[<ffffffff8116589a>] [<ffffffff8116589a>] kmem_cache_alloc+0x5a/0x140
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RSP: 0018:ffff880059877d78 EFLAGS: 00010206
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RAX: 0000000000000000 RBX: 00007f202c59d000 RCX: 000000000005b2ed
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RDX: 000000000005b2ec RSI: 0000000000016da0 RDI: ffff88006d408a00
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RBP: ffff880059877dc8 R08: ffff88006fa96da0 R09: 0000000000000001
Jan 6 20:13:35 localhost kernel: [ 1096.188008] R10: 0000000000100073 R11: ffff880059dbb2c0 R12: ffff88006d408a00
Jan 6 20:13:35 localhost kernel: [ 1096.188008] R13: 2665c4979a04b7b8 R14: ffffffff811447c5 R15: 00000000000080d0
Jan 6 20:13:35 localhost kernel: [ 1096.188008] FS: 00007f202c5ac700(0000) GS:ffff88006fa80000(0000) knlGS:0000000000000000
Jan 6 20:13:35 localhost kernel: [ 1096.188008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 6 20:13:35 localhost kernel: [ 1096.188008] CR2: 00000000025991f0 CR3: 0000000059dbc000 CR4: 00000000000006e0
Jan 6 20:13:35 localhost kernel: [ 1096.188008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 6 20:13:35 localhost kernel: [ 1096.188008] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jan 6 20:13:35 localhost kernel: [ 1096.188008] Process zsh (pid: 2564, threadinfo ffff880059876000, task ffff88006b6b5c00)
Jan 6 20:13:35 localhost kernel: [ 1096.188008] Stack:
Jan 6 20:13:35 localhost kernel: [ 1096.188008] 0000000000000001 0000000000001000 0000000000000001 ffffffff8129e2e0
Jan 6 20:13:35 localhost kernel: [ 1096.188008] 0000000000000001 00007f202c59d000 ffff88006822f480 0000000000000001
Jan 6 20:13:35 localhost kernel: [ 1096.188008] 0000000000001000 0000000000000000 ffff880059877e88 ffffffff811447c5
Jan 6 20:13:35 localhost kernel: [ 1096.188008] Call Trace:
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff8129e2e0>] ? cap_vm_enough_memory+0x50/0x60
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff811447c5>] mmap_region+0x2a5/0x4f0
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff81144d58>] do_mmap_pgoff+0x348/0x360
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff81144eb1>] sys_mmap_pgoff+0x141/0x230
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff81018b12>] sys_mmap+0x22/0x30
Jan 6 20:13:35 localhost kernel: [ 1096.188008] [<ffffffff816655c2>] system_call_fastpath+0x16/0x1b
Jan 6 20:13:35 localhost kernel: [ 1096.188008] Code: 00 4d 8b 04 24 65 4c 03 04 25 50 da 00 00 49 8b 50 08 4d 8b 28 4d 85 ed 0f 84 d8 00 00 00 49 63 44 24 20 49 8b 34 24 48 8d 4a 01 <49> 8b 5c 05 00 4c 89 e8 65 48 0f c7 0e 0f 94 c0 84 c0 74 c2 4d
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RIP [<ffffffff8116589a>] kmem_cache_alloc+0x5a/0x140
Jan 6 20:13:35 localhost kernel: [ 1096.188008] RSP <ffff880059877d78>
Jan 6 20:13:35 localhost kernel: [ 1096.274513] ---[ end trace 766ef1ef52f774ae ]---
Jan 6 20:13:37 localhost kernel: [ 1097.836149] BUG: Bad page state in process swapper/0 pfn:59a33
Jan 6 20:13:37 localhost kernel: [ 1097.838885] page:ffffea0001668cc0 count:0 mapcount:-1 mapping: (null) index:0xffff880059a33160
Jan 6 20:13:37 localhost kernel: [ 1097.841673] page flags: 0x100000000000000()
Jan 6 20:13:37 localhost kernel: [ 1097.844440] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs ext2 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc dm_crypt ppdev ipt_REJECT ipt_LOG ipt_MASQUERADE xt_state iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables joydev sp5100_tco edac_core i2c_piix4 serio_raw k8temp edac_mce_amd snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore parport_pc snd_page_alloc mac_hid shpchp lp parport radeon 8139too ttm drm_kms_helper drm pata_atiixp i2c_algo_bit usbhid hid wmi r8169
Jan 6 20:13:37 localhost kernel: [ 1097.856881] Pid: 0, comm: swapper/0 Tainted: G D 3.2.0-35-generic #55-Ubuntu
Jan 6 20:13:37 localhost kernel: [ 1097.860020] Call Trace:
Jan 6 20:13:37 localhost kernel: [ 1097.863063] <IRQ> [<ffffffff8111fe8f>] bad_page.part.61+0x9f/0xf0
Jan 6 20:13:37 localhost kernel: [ 1097.866119] [<ffffffff8111fef8>] bad_page+0x18/0x30
Jan 6 20:13:37 localhost kernel: [ 1097.869158] [<ffffffff8112098e>] free_pages_prepare+0x10e/0x120
Jan 6 20:13:37 localhost kernel: [ 1097.872178] [<ffffffff81120af9>] free_hot_cold_page+0x49/0x1a0
Jan 6 20:13:37 localhost kernel: [ 1097.875183] [<ffffffff81120c7d>] __free_pages+0x2d/0x40
Jan 6 20:13:37 localhost kernel: [ 1097.878163] [<ffffffff8159a8fb>] tcp_v4_destroy_sock+0x25b/0x2c0
Jan 6 20:13:37 localhost kernel: [ 1097.881105] [<ffffffff81582695>] inet_csk_destroy_sock+0x55/0x140
Jan 6 20:13:37 localhost kernel: [ 1097.883970] [<ffffffff815849b0>] tcp_done+0x50/0x90
Jan 6 20:13:37 localhost kernel: [ 1097.886853] [<ffffffff81591d92>] tcp_rcv_state_process+0x422/0x5f0
Jan 6 20:13:37 localhost kernel: [ 1097.889724] [<ffffffff8159a597>] tcp_v4_do_rcv+0xc7/0x1d0
Jan 6 20:13:37 localhost kernel: [ 1097.892513] [<ffffffff8159c1f1>] tcp_v4_rcv+0x581/0x820
Jan 6 20:13:37 localhost kernel: [ 1097.895301] [<ffffffff81577b60>] ? ip_rcv_finish+0x370/0x370
Jan 6 20:13:37 localhost kernel: [ 1097.898110] [<ffffffff81577b60>] ? ip_rcv_finish+0x370/0x370
Jan 6 20:13:37 localhost kernel: [ 1097.900915] [<ffffffff81577c3d>] ip_local_deliver_finish+0xdd/0x280
Jan 6 20:13:37 localhost kernel: [ 1097.903716] [<ffffffff81577fa8>] ip_local_deliver+0x88/0x90
Jan 6 20:13:37 localhost kernel: [ 1097.906502] [<ffffffff815778fd>] ip_rcv_finish+0x10d/0x370
Jan 6 20:13:37 localhost kernel: [ 1097.909279] [<ffffffff815781e5>] ip_rcv+0x235/0x300
Jan 6 20:13:37 localhost kernel: [ 1097.912067] [<ffffffff81613dc7>] ? packet_rcv_spkt+0x47/0x190
Jan 6 20:13:37 localhost kernel: [ 1097.914831] [<ffffffff81543446>] __netif_receive_skb+0x4d6/0x550
Jan 6 20:13:37 localhost kernel: [ 1097.917624] [<ffffffff81544230>] netif_receive_skb+0x80/0x90
Jan 6 20:13:37 localhost kernel: [ 1097.920415] [<ffffffff81536474>] ? __netdev_alloc_skb+0x24/0x50
Jan 6 20:13:37 localhost kernel: [ 1097.923124] [<ffffffffa00d6e90>] rtl8139_rx+0x150/0x2b0 [8139too]
Jan 6 20:13:37 localhost kernel: [ 1097.925754] [<ffffffffa00d704a>] rtl8139_poll+0x5a/0xd0 [8139too]
Jan 6 20:13:37 localhost kernel: [ 1097.928274] [<ffffffff81544bd4>] net_rx_action+0x134/0x290
Jan 6 20:13:37 localhost kernel: [ 1097.930698] [<ffffffff8103df8b>] ? native_safe_halt+0xb/0x10
Jan 6 20:13:37 localhost kernel: [ 1097.933115] [<ffffffff8106f6e8>] __do_softirq+0xa8/0x210
Jan 6 20:13:37 localhost kernel: [ 1097.935495] [<ffffffff810967f5>] ? do_timer+0x25/0x30
Jan 6 20:13:37 localhost kernel: [ 1097.937836] [<ffffffff81035dc2>] ? ack_apic_level+0x72/0x190
Jan 6 20:13:37 localhost kernel: [ 1097.940163] [<ffffffff8166782c>] call_softirq+0x1c/0x30
Jan 6 20:13:37 localhost kernel: [ 1097.942464] [<ffffffff81016305>] do_softirq+0x65/0xa0
Jan 6 20:13:37 localhost kernel: [ 1097.944778] [<ffffffff8106face>] irq_exit+0x8e/0xb0
Jan 6 20:13:37 localhost kernel: [ 1097.947068] [<ffffffff816680e3>] do_IRQ+0x63/0xe0
Jan 6 20:13:37 localhost kernel: [ 1097.949327] [<ffffffff8165d46e>] common_interrupt+0x6e/0x6e
Jan 6 20:13:37 localhost kernel: [ 1097.951597] <EOI> [<ffffffff8103df8b>] ? native_safe_halt+0xb/0x10
Jan 6 20:13:37 localhost kernel: [ 1097.953891] [<ffffffff810900a8>] ? hrtimer_start+0x18/0x20
Jan 6 20:13:37 localhost kernel: [ 1097.956171] [<ffffffff8101c983>] default_idle+0x53/0x1d0
Jan 6 20:13:37 localhost kernel: [ 1097.958426] [<ffffffff8101cb5d>] amd_e400_idle+0x5d/0x120
Jan 6 20:13:37 localhost kernel: [ 1097.960704] [<ffffffff81013236>] cpu_idle+0xd6/0x120
Jan 6 20:13:37 localhost kernel: [ 1097.962970] [<ffffffff816235ee>] rest_init+0x72/0x74
Jan 6 20:13:37 localhost kernel: [ 1097.965195] [<ffffffff81cfbc03>] start_kernel+0x3b0/0x3bd
Jan 6 20:13:37 localhost kernel: [ 1097.967421] [<ffffffff81cfb388>] x86_64_start_reservations+0x132/0x136
Jan 6 20:13:37 localhost kernel: [ 1097.969660] [<ffffffff81cfb140>] ? early_idt_handlers+0x140/0x140
Jan 6 20:13:37 localhost kernel: [ 1097.971888] [<ffffffff81cfb459>] x86_64_start_kernel+0xcd/0xdc
O que está acontecendo aqui? O que eu posso fazer?
memtest
. Mas, como seus rastros aparecem muito cedo, duvido que seja algo de memória. Qual hardware tem seu servidor? Você fez algum ajuste / overclock?