我有 Ubuntu 16.04，它突然重启。我很确定这种情况的发生与我在计算机上所做的操作无关。
以下是此事发生前几分钟或几秒钟的日志：
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: New seat seat0.
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event3 (Power Button)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event8 (Asus Wireless Radio Control)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event6 (Video Bus)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event5 (Video Bus)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event0 (Power Button)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event1 (Lid Switch)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event2 (Sleep Button)
Apr 24 09:53:41 bolloename-X555BP systemd-logind[801]: Watching system buttons on /dev/input/event9 (Asus WMI hotkeys)
Apr 24 09:53:45 bolloename-X555BP lightdm: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory
Apr 24 09:53:45 bolloename-X555BP lightdm: PAM adding faulty module: pam_kwallet.so
Apr 24 09:53:45 bolloename-X555BP lightdm: pam_kwallet5(lightdm-greeter:setcred): (null): pam_sm_setcred
Apr 24 09:53:45 bolloename-X555BP lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Apr 24 09:53:45 bolloename-X555BP systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
Apr 24 09:53:45 bolloename-X555BP systemd-logind[801]: New session c1 of user lightdm.
Apr 24 09:53:45 bolloename-X555BP lightdm: pam_kwallet5(lightdm-greeter:session): (null): pam_sm_open_session
Apr 24 09:53:45 bolloename-X555BP lightdm: pam_kwallet5(lightdm-greeter:session): pam_kwallet5: open_session called without kwallet5_key
Apr 24 09:53:48 bolloename-X555BP lightdm: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory
Apr 24 09:53:48 bolloename-X555BP lightdm: PAM adding faulty module: pam_kwallet.so
Apr 24 09:53:48 bolloename-X555BP lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "bolloename"
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm:auth): (null): pam_sm_authenticate
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm-greeter:session): pam_kwallet5: pam_sm_close_session
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm-greeter:setcred): pam_kwallet5: pam_sm_setcred
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm:setcred): pam_kwallet5: pam_sm_setcred
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_unix(lightdm:session): session opened for user bolloename by (uid=0)
Apr 24 09:53:55 bolloename-X555BP systemd: pam_unix(systemd-user:session): session opened for user bolloename by (uid=0)
Apr 24 09:53:55 bolloename-X555BP systemd-logind[801]: New session c2 of user bolloename.
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm:session): pam_kwallet5: pam_sm_open_session
Apr 24 09:53:55 bolloename-X555BP lightdm: pam_kwallet5(lightdm:session): pam_kwallet5: final socket path: /tmp/kwallet5_bolloename.socket
Apr 24 09:54:01 bolloename-X555BP gnome-keyring-daemon[1256]: The Secret Service was already initialized
Apr 24 09:54:01 bolloename-X555BP gnome-keyring-daemon[1256]: The SSH agent was already initialized
Apr 24 09:54:01 bolloename-X555BP gnome-keyring-daemon[1256]: The PKCS#11 component was already initialized
Apr 24 09:54:01 bolloename-X555BP polkitd(authority=local): Registered Authentication Agent for unix-session:c2 (system bus name :1.70 [/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1], object path /org/gnome/PolicyKit1/AuthenticationAgent, locale es_CO.UTF-8)
Apr 24 09:55:04 bolloename-X555BP pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Apr 24 09:55:04 bolloename-X555BP pkexec: pam_systemd(polkit-1:session): Cannot create session: Already running in a session
Apr 24 09:55:04 bolloename-X555BP pkexec[2221]: bolloename: Executing command [USER=root] [TTY=unknown] [CWD=/home/bolloename] [COMMAND=/usr/lib/update-notifier/package-system-locked]
Apr 24 09:55:46 bolloename-X555BP systemd-logind[801]: Removed session c1.
Apr 24 09:55:46 bolloename-X555BP systemd: pam_unix(systemd-user:session): session closed for user lightdm
非常感谢！
更新：
我已经运行了 memtest 超过 16 个小时，1 次通过，0 个错误，测试 25%，测试 #3。我不得不关闭它，因为它当时冻结了。它在测试 #2 上停留了超过 13 个小时，所以我跳过了它。然后发生了那件事......
另外，这是锁定屏幕之前出现的日志：
a[0.022630] [Firmware bug]: cpu 0, invalid threshold interrupt offset 1 for bank 4, block 0 (MSR00000413=0xD000000001000000)
[0.941981] Couldn't get size: 0x800000000000000e
[0.941986] MODSIGN: Couldn't get UEFI de list
[0.946154] Couldn't get size: 0x800000000000000e
[1.021351] ACPI Error: (^^PB2_.VGA_.AFM7] Namespace lookup failure, AE_NOT_FOUND (20170531/psparse-550)
[1.021364] ACPI Error: Method parse/execution failed \_SB.PCI0.VGA:LCDD._BCM, AE_NOT_FOUND (20170531/psparse-550)
[1.021371] ACPI Error: Evaluating _BCM failed (20170531/video-364)
Ubuntu_16: clean, 2777420/1921360 files, 2438809/7679931 blocks
更新 #2：
sudo dmidecode -t 内存
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 3.0.0 present.
Handle 0x0011, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 8 GB
Error Information Handle: Not Provided
Number Of Devices: 2
Handle 0x0013, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x0011
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: SODIMM
Set: None
Locator: DIMM 0
Bank Locator: CHANNEL A
Type: DDR4
Type Detail: None
Speed: Unknown
Manufacturer: A1_Manufacturer0
Serial Number: A1_SerialNum0
Asset Tag: A1_AssetTagNum0
Part Number: A1_PartNum0
Rank: Unknown
Configured Clock Speed: Unknown
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: Unknown
Handle 0x0014, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x0011
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: SODIMM
Set: None
Locator: DIMM 1
Bank Locator: CHANNEL A
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 2133 MHz
Manufacturer: Micron
Serial Number: 00000000
Asset Tag: A1_AssetTagNum1
Part Number: 8ATF1G64HZ-2G1B1
Rank: 1
Configured Clock Speed: 1866 MHz
Minimum Voltage: 1.25 V
Maximum Voltage: 1.35 V
Configured Voltage: 1.35 V
sudo lshw -c 内存
*-firmware
description: BIOS
manufacturer: American Megatrends Inc.
physical id: 0
version: X555BP.320
date: 09/08/2017
size: 64KiB
capacity: 8128KiB
capacities (or capabilities*): pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification uefi
*-cache:0
descripción: L1 caché
id físico: 6
ranura: L1 CACHE
tamaño: 160KiB
capacidad: 160KiB
reloj: 1GHz (1.0ns)
capacidades: pipeline-burst internal write-back unified
configuración: level=1
*-cache:1
description: L2 caché
physical id: 7
slot: L2 CACHE
size: 1MiB
capacity: 1MiB
clock: 1GHz (1.0ns)
capacities: pipeline-burst internal write-back unified
configuration: level=2
*-memory
description: Memoria de sistema
physical id: 11
slot: base
tamaño: 8GiB
*-bank:0
description: SODIMM [vacío]
product: A1_PartNum0
manufacturer: A1_Manufacturer0
physical id: 0
series: A1_SerialNum0
slot: DIMM 0
widht: 64 bits
*-bank:1
description: SODIMM Síncrono 2133 MHz (0,5 ns)
product: 8ATF1G64HZ-2G1B1
manufacturer: Micron
physical id: 1
series: 00000000
slot: DIMM 1
size: 8GiB
widht: 64 bits
clock: 2133MHz (0.5ns)