我有这个功能齐全的 Amazon Linux 2 实例，我已将其配置为邮件服务器。夏天的时候我把它关闭了。但仅此而已。现在当我尝试启动它时，它只通过了 1/2 检查，实例状态检查失败。实例无法访问。我尝试重新连接 IP，看看是否是网络问题，但没有变化。在系统日志中，试图查找不一致之处，我发现内核崩溃。具体来说：
[ 2.330642] Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[ 2.341751] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.128-112.105.amzn2.x86_64 #1
[ 2.348702] Hardware name: Amazon EC2 t3.micro/, BIOS 1.0 10/16/2017
[ 2.353256] Call Trace:
[ 2.356063] dump_stack+0x5c/0x82
[ 2.359252] ? rest_init+0x10/0xb0
[ 2.362449] panic+0xe4/0x252
[ 2.365444] ? do_execveat_common.isra.31+0x87/0x820
[ 2.369391] ? rest_init+0xb0/0xb0
[ 2.372587] kernel_init+0xeb/0xfc
[ 2.375852] ret_from_fork+0x35/0x40
[ 2.379959] Kernel Offset: disabled
[ 2.383237] ---[ end Kernel panic..]
我不知所措。自系统运行以来，没有对卷或内核进行任何更改。是什么导致了这个问题？
在日志结束之前（内核恐慌之后），我还收到了另外两种类型的警告：
[ 2.398371] WARNING: CPU: 1 PID: 1 at kernel/sched/core.c:1198 set_task_cpu+0x177/0x180
[ 2.405144] Modules linked in:
[ 2.408252] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.128-112.105.amzn2.x86_64 #1
[ 2.414987] Hardware name: Amazon EC2 t3.micro/, BIOS 1.0 10/16/2017
[ 2.419494] task: ffff88803deb4000 task.stack: ffffc90000194000
[ 2.423834] RIP: 0010:set_task_cpu+0x177/0x180
[ 2.427527] RSP: 0000:ffff88803e103e30 EFLAGS: 00010006
[ 2.431555] RAX: 0000000000000200 RBX: ffff88803df18000 RCX: 0000000000000090
[ 2.436436] RDX: ffffffffffffffd8 RSI: 0000000000000000 RDI: ffff88803df18000
[ 2.441357] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000003
[ 2.446228] R10: 0000000000000010 R11: 0000000000000000 R12: ffff88803df18b34
[ 2.451314] R13: 0000000000000000 R14: 0000000000000246 R15: 0000000000021380
[ 2.456536] FS: 0000000000000000(0000) GS:ffff88803e100000(0000) knlGS:0000000000000000
[ 2.463460] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.467777] CR2: 0000000000000000 CR3: 000000000200a001 CR4: 00000000007606e0
[ 2.472646] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.477707] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2.482526] PKRU: 00000000
[ 2.485418] Call Trace:
[ 2.488215] <IRQ>
[ 2.490820] try_to_wake_up+0x154/0x490
[ 2.494284] ? __queue_work+0x11c/0x410
[ 2.497707] ? call_timer_fn+0x130/0x130
[ 2.501135] call_timer_fn+0x30/0x130
[ 2.504433] run_timer_softirq+0x3f0/0x450
[ 2.507943] ? timerqueue_add+0x52/0x80
[ 2.622453] ? enqueue_hrtimer+0x37/0x80
[ 2.625931] __do_softirq+0xe3/0x2c7
[ 2.629236] irq_exit+0xbd/0xd0
[ 2.632357] smp_apic_timer_interrupt+0x78/0x130
[ 2.636131] apic_timer_interrupt+0x7d/0x90
[ 2.639758] </IRQ>
[ 2.642441] RIP: 0010:panic+0x201/0x252
[ 2.645950] RSP: 0000:ffffc90000197ec8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
[ 2.652663] RAX: 000000000000009b RBX: ffffffff81607900 RCX: ffffffff82065548
[ 2.657640] RDX: 0000000000000000 RSI: 0000000000000092 RDI: 0000000000000046
[ 2.662559] RBP: ffffc90000197f40 R08: 0000000000000168 R09: 000000000000000f
[ 2.667455] R10: ffffffff821ddbe0 R11: ffffffff826e872d R12: 0000000000000000
[ 2.672391] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 2.677708] ? rest_init+0x10/0xb0
[ 2.681017] ? panic+0x1fa/0x252
[ 2.684341] ? do_execveat_common.isra.31+0x87/0x820
[ 2.688306] ? rest_init+0xb0/0xb0
[ 2.691632] kernel_init+0xeb/0xfc
[ 2.694988] ret_from_fork+0x35/0x40
[ 2.698394] Code: 0e ff ff ff 80 8b 6c 08 00 00 04 e9 2a ff ff ff 0f 0b e9 ce fe ff ff f7 43 5c fd ff ff ff 0f 84 d8 fe ff ff 0f 0b e9 d1 fe ff ff <0f> 0b e9 db fe ff ff 66 90 0f 1f 44 00 00 41 55 41 54 49 89 f5
[ 2.711861] ---[ end trace 7b2141584b80ec24 ]---
[ 2.715622] sched: Unexpected reschedule of offline CPU#0!
[ 2.723573] WARNING: CPU: 1 PID: 1 at arch/x86/kernel/smp.c:128 native_smp_send_reschedule+0x37/0x40
[ 2.730938] Modules linked in:
[ 2.734042] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 4.14.128-112.105.amzn2.x86_64 #1
[ 2.741424] Hardware name: Amazon EC2 t3.micro/, BIOS 1.0 10/16/2017
[ 2.745941] task: ffff88803deb4000 task.stack: ffffc90000194000
[ 2.750354] RIP: 0010:native_smp_send_reschedule+0x37/0x40
[ 2.754563] RSP: 0000:ffff88803e103e18 EFLAGS: 00010086
[ 2.758654] RAX: 000000000000002e RBX: ffff88803e021380 RCX: ffffffff82065548
[ 2.763553] RDX: 0000000000000000 RSI: 0000000000000096 RDI: 0000000000000046
[ 2.768488] RBP: ffff88803e021380 R08: 0000000000000199 R09: 000000000000000f
[ 2.773431] R10: ffff88803e103d40 R11: ffffffff826e872d R12: ffff88803df18000
[ 2.778717] R13: ffff88803e103e68 R14: 0000000000000246 R15: 0000000000021380
[ 2.783660] FS: 0000000000000000(0000) GS:ffff88803e100000(0000) knlGS:0000000000000000
[ 2.790587] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.794889] CR2: 0000000000000000 CR3: 000000000200a001 CR4: 00000000007606e0
[ 2.799878] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.804779] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2.809674] PKRU: 00000000
[ 2.812641] Call Trace:
[ 2.815456] <IRQ>
[ 2.818130] check_preempt_curr+0x75/0x80
[ 2.821640] ttwu_do_wakeup+0x19/0x140
[ 2.825031] try_to_wake_up+0x1d1/0x490
[ 2.828570] ? __queue_work+0x11c/0x410
[ 2.832008] ? call_timer_fn+0x130/0x130
[ 2.835543] call_timer_fn+0x30/0x130
[ 2.838958] run_timer_softirq+0x3f0/0x450
[ 2.842498] ? timerqueue_add+0x52/0x80
[ 2.845953] ? enqueue_hrtimer+0x37/0x80
[ 2.849532] __do_softirq+0xe3/0x2c7
[ 2.852846] irq_exit+0xbd/0xd0
[ 2.856006] smp_apic_timer_interrupt+0x78/0x130
[ 2.859839] apic_timer_interrupt+0x7d/0x90
[ 2.863436] </IRQ>
[ 2.866089] RIP: 0010:panic+0x201/0x252
[ 2.869540] RSP: 0000:ffffc90000197ec8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
[ 2.876169] RAX: 000000000000009b RBX: ffffffff81607900 RCX: ffffffff82065548
[ 2.881295] RDX: 0000000000000000 RSI: 0000000000000092 RDI: 0000000000000046
[ 2.886293] RBP: ffffc90000197f40 R08: 0000000000000168 R09: 000000000000000f
[ 2.891396] R10: ffffffff821ddbe0 R11: ffffffff826e872d R12: 0000000000000000
[ 2.896413] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 2.901459] ? rest_init+0x10/0xb0
[ 2.904800] ? panic+0x1fa/0x252
[ 2.908095] ? do_execveat_common.isra.31+0x87/0x820
[ 2.912120] ? rest_init+0xb0/0xb0
[ 2.915520] kernel_init+0xeb/0xfc
[ 2.918961] ret_from_fork+0x35/0x40
[ 2.922434] Code: f5 18 01 73 18 48 8b 05 f8 14 e1 00 be fd 00 00 00 48 8b 80 a0 00 00 00 e9 e7 49 9b 00 89 fe 48 c7 c7 c8 ad dc 81 e8 74 73 09 00 <0f> 0b c3 66 0f 1f 44 00 00 0f 1f 44 00 00 48 83 ec 20 65 48 8b
[ 2.936170] ---[ end trace 7b2141584b80ec25 ]---