几个月以来，我托管的 Ubuntu Server 上一直出现随机崩溃的情况。需要完全重启服务器才能从此问题中恢复，当被要求调查时，数据中心工作人员提到服务器对键盘/鼠标输入没有响应。
日志中看起来有用的最后一部分是：
Oct 27 21:17:01 Saturn CRON[30865]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Oct 27 21:21:40 Saturn postfix/pickup[10347]: EC8A9CE64B4: uid=997 from=<netdata>
Oct 27 21:21:40 Saturn postfix/cleanup[829]: EC8A9CE64B4: message-id=<20191027212140.EC8A9CE64B4@Saturn>
Oct 27 21:21:40 Saturn postfix/qmgr[1326]: EC8A9CE64B4: from=<netdata@Saturn>, size=11780, nrcpt=1 (queue active)
Oct 27 21:21:40 Saturn postfix/local[833]: EC8A9CE64B4: to=<root@Saturn>, orig_to=<root>, relay=local, delay=0.02, delays=0.01/0/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Oct 27 21:21:40 Saturn postfix/qmgr[1326]: EC8A9CE64B4: removed
Oct 27 21:23:56 Saturn systemd[1164]: run-docker-runtime\x2drunc-moby-c4764ab9109aae885cb77563bee3e76337fd82fa3ffd5ca4b42df80f5a7ce9db-runc.oEplxK.mount: Succeeded.
Oct 27 21:23:56 Saturn systemd[15100]: run-docker-runtime\x2drunc-moby-c4764ab9109aae885cb77563bee3e76337fd82fa3ffd5ca4b42df80f5a7ce9db-runc.oEplxK.mount: Succeeded.
Oct 27 21:23:56 Saturn systemd[3122]: run-docker-runtime\x2drunc-moby-c4764ab9109aae885cb77563bee3e76337fd82fa3ffd5ca4b42df80f5a7ce9db-runc.oEplxK.mount: Succeeded.
Oct 27 21:26:40 Saturn postfix/pickup[10347]: 602BCCE64B4: uid=997 from=<netdata>
Oct 27 21:26:40 Saturn postfix/cleanup[3588]: 602BCCE64B4: message-id=<20191027212640.602BCCE64B4@Saturn>
Oct 27 21:26:40 Saturn postfix/qmgr[1326]: 602BCCE64B4: from=<netdata@Saturn>, size=11874, nrcpt=1 (queue active)
Oct 27 21:26:40 Saturn postfix/local[3592]: 602BCCE64B4: to=<root@Saturn>, orig_to=<root>, relay=local, delay=0.02, delays=0.02/0/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Oct 27 21:26:40 Saturn postfix/qmgr[1326]: 602BCCE64B4: removed
Oct 27 21:30:57 Saturn kernel: [41976.366147] ------------[ cut here ]------------
Oct 27 21:30:57 Saturn kernel: [41976.366153] NETDEV WATCHDOG: enp3s0 (r8169): transmit queue 0 timed out
Oct 27 21:30:57 Saturn kernel: [41976.366177] WARNING: CPU: 4 PID: 0 at net/sched/sch_generic.c:466 dev_watchdog+0x221/0x230
Oct 27 21:30:57 Saturn kernel: [41976.366178] Modules linked in: ipt_REJECT nf_reject_ipv4 xt_multiport xt_nat xt_tcpudp veth xt_conntrack ipt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc cfg80211 aufs overlay intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi aesni_intel aes_x86_64 snd_hda_codec_realtek crypto_simd cryptd glue_helper snd_hda_codec_generic intel_cstate ledtrig_audio intel_rapl_perf i915 eeepc_wmi asus_wmi input_leds sparse_keymap wmi_bmof kvmgt vfio_mdev mdev vfio_iommu_type1 vfio kvm snd_hda_intel irqbypass serio_raw snd_hda_codec drm_kms_helper snd_hda_core drm snd_hwdep snd_pcm snd_timer i2c_algo_bit fb_sys_fops snd syscopyarea sysfillrect sysimgblt soundcore ie31200_edac mac_hid sch_fq_codel ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456
Oct 27 21:30:57 Saturn kernel: [41976.366226] async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear r8169 ahci realtek i2c_i801 lpc_ich libahci wmi video
Oct 27 21:30:57 Saturn kernel: [41976.366243] CPU: 4 PID: 0 Comm: swapper/4 Kdump: loaded Not tainted 5.0.0-32-generic #34-Ubuntu
Oct 27 21:30:57 Saturn kernel: [41976.366244] Hardware name: System manufacturer System Product Name/P8H77-M PRO, BIOS 9012 09/18/2018
Oct 27 21:30:57 Saturn kernel: [41976.366247] RIP: 0010:dev_watchdog+0x221/0x230
Oct 27 21:30:57 Saturn kernel: [41976.366249] Code: 00 49 63 4e e0 eb 92 4c 89 ef c6 05 cc c7 ef 00 01 e8 63 2e fc ff 89 d9 4c 89 ee 48 c7 c7 f0 c1 7c b5 48 89 c2 e8 f1 38 79 ff <0f> 0b eb c0 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48
Oct 27 21:30:57 Saturn kernel: [41976.366251] RSP: 0018:ffff97560f903e68 EFLAGS: 00010286
Oct 27 21:30:57 Saturn kernel: [41976.366252] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
Oct 27 21:30:57 Saturn kernel: [41976.366254] RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff97560f916440
Oct 27 21:30:57 Saturn kernel: [41976.366255] RBP: ffff97560f903e98 R08: 0000000000000001 R09: 00000000000003db
Oct 27 21:30:57 Saturn kernel: [41976.366256] R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000001
Oct 27 21:30:57 Saturn kernel: [41976.366257] R13: ffff9756033a0000 R14: ffff9756033a04c0 R15: ffff9756033d5680
Oct 27 21:30:57 Saturn kernel: [41976.366259] FS: 0000000000000000(0000) GS:ffff97560f900000(0000) knlGS:0000000000000000
Oct 27 21:30:57 Saturn kernel: [41976.366260] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Oct 27 21:30:57 Saturn kernel: [41976.366261] CR2: 00007fb4afd794d0 CR3: 00000003c4e84003 CR4: 00000000001606e0
Oct 27 21:30:57 Saturn kernel: [41976.366262] Call Trace:
Oct 27 21:30:57 Saturn kernel: [41976.366265] <IRQ>
Oct 27 21:30:57 Saturn kernel: [41976.366269] ? pfifo_fast_enqueue+0x120/0x120
Oct 27 21:30:57 Saturn kernel: [41976.366273] call_timer_fn+0x30/0x130
Oct 27 21:30:57 Saturn kernel: [41976.366277] run_timer_softirq+0x3e4/0x420
Oct 27 21:30:57 Saturn kernel: [41976.366279] ? ktime_get+0x40/0xa0
Oct 27 21:30:57 Saturn kernel: [41976.366282] ? lapic_next_deadline+0x26/0x30
Oct 27 21:30:57 Saturn kernel: [41976.366285] ? clockevents_program_event+0x93/0xf0
Oct 27 21:30:57 Saturn kernel: [41976.366290] __do_softirq+0xdc/0x2f3
Oct 27 21:30:57 Saturn kernel: [41976.366294] irq_exit+0xc0/0xd0
Oct 27 21:30:57 Saturn kernel: [41976.366297] smp_apic_timer_interrupt+0x79/0x140
Oct 27 21:30:57 Saturn kernel: [41976.366300] apic_timer_interrupt+0xf/0x20
Oct 27 21:30:57 Saturn kernel: [41976.366301] </IRQ>
Oct 27 21:30:57 Saturn kernel: [41976.366305] RIP: 0010:cpuidle_enter_state+0xbd/0x450
Oct 27 21:30:57 Saturn kernel: [41976.366307] Code: ff e8 b7 9c 86 ff 80 7d c7 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 63 03 00 00 31 ff e8 4a cd 8c ff fb 66 0f 1f 44 00 00 <45> 85 ed 0f 89 cf 01 00 00 41 c7 44 24 08 00 00 00 00 48 83 c4 18
Oct 27 21:30:57 Saturn kernel: [41976.366308] RSP: 0018:ffffb60f4193be60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
Oct 27 21:30:57 Saturn kernel: [41976.366310] RAX: ffff97560f923200 RBX: ffffffffb5b53e20 RCX: 000000000000001f
Oct 27 21:30:57 Saturn kernel: [41976.366311] RDX: 0000262d62648439 RSI: 0000000025a5a65f RDI: 0000000000000000
Oct 27 21:30:57 Saturn kernel: [41976.366312] RBP: ffffb60f4193bea0 R08: 0000000000000002 R09: 0000000000022ac0
Oct 27 21:30:57 Saturn kernel: [41976.366313] R10: 000081ea9085bf94 R11: ffff97560f922084 R12: ffff97560f92e100
Oct 27 21:30:57 Saturn kernel: [41976.366314] R13: 0000000000000002 R14: ffffffffb5b53ef8 R15: ffffffffb5b53ee0
Oct 27 21:30:57 Saturn kernel: [41976.366318] cpuidle_enter+0x17/0x20
Oct 27 21:30:57 Saturn kernel: [41976.366321] call_cpuidle+0x23/0x40
Oct 27 21:30:57 Saturn kernel: [41976.366323] do_idle+0x23a/0x280
Oct 27 21:30:57 Saturn kernel: [41976.366326] cpu_startup_entry+0x1d/0x20
Oct 27 21:30:57 Saturn kernel: [41976.366330] start_secondary+0x1ab/0x200
Oct 27 21:30:57 Saturn kernel: [41976.366334] secondary_startup_64+0xa4/0xb0
Oct 27 21:30:57 Saturn kernel: [41976.366336] ---[ end trace e85dcae9ecb25671 ]---