我有一个CentOS 7的EC2实例，在重新启动和停止 – 启动后，实例不能再运行了。
我得到了这个错误，是什么原因造成的以及如何修复它，谢谢：
[ 1.601892] List of all partitions: [ 1.604458] No filesystem could mount root, tried: [ 1.608147] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 1.609140] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-514.16.1.el7.x86_64 #1 [ 1.609140] Hardware name: Xen HVM domU, BIOS 4.2.amazon 02/16/2017 =====更完整的日志
[ 0.802498] registered taskstats version 1 [ 0.805672] Key type trusted registered [ 0.808549] Key type encrypted registered [ 0.811468] IMA: No TPM chip found, activating TPM-bypass! [ 0.815226] xenbus_probe_frontend: Device with no driver: device/vbd/768 [ 0.819871] xenbus_probe_frontend: Device with no driver: device/vif/0 [ 0.824033] rtc_cmos 00:02: setting system clock to 2017-06-07 08:57:52 UTC (1496825872) [ 1.516119] tsc: Refined TSC clocksource calibration: 2399.999 MHz [ 1.576495] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3 [ 1.582622] md: Waiting for all devices to be available before autodetect [ 1.587126] md: If you don't use raid, use raid=noautodetect [ 1.590876] md: Autodetecting RAID arrays. [ 1.593819] md: Scanned 0 and added 0 devices. [ 1.597016] md: autorun ... [ 1.599321] md: ... autorun DONE. [ 1.601892] List of all partitions: [ 1.604458] No filesystem could mount root, tried: [ 1.608147] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 1.609140] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-514.16.1.el7.x86_64 #1 [ 1.609140] Hardware name: Xen HVM domU, BIOS 4.2.amazon 02/16/2017 [ 1.609140] ffffffff818b44d0 00000000dbd248fc ffff88003d66fd60 ffffffff81686ac3 [ 1.609140] ffff88003d66fde0 ffffffff8167feca ffffffff00000010 ffff88003d66fdf0 [ 1.609140] ffff88003d66fd90 00000000dbd248fc 00000000dbd248fc ffff88003d66fe00 [ 1.609140] Call Trace: [ 1.609140] [<ffffffff81686ac3>] dump_stack+0x19/0x1b [ 1.609140] [<ffffffff8167feca>] panic+0xe3/0x1f2 [ 1.609140] [<ffffffff81b0a5fd>] mount_block_root+0x2a1/0x2b0 [ 1.609140] [<ffffffff81b0a65f>] mount_root+0x53/0x56 [ 1.609140] [<ffffffff81b0a79e>] prepare_namespace+0x13c/0x174 [ 1.609140] [<ffffffff81b0a26b>] kernel_init_freeable+0x1f0/0x217 [ 1.609140] [<ffffffff81b099db>] ? initcall_blacklist+0xb0/0xb0 [ 1.609140] [<ffffffff81674fa0>] ? rest_init+0x80/0x80 [ 1.609140] [<ffffffff81674fae>] kernel_init+0xe/0xf0 [ 1.609140] [<ffffffff816970d8>] ret_from_fork+0x58/0x90 [ 1.609140] [<ffffffff81674fa0>] ? rest_init+0x80/0x80