Sometimes CentOS just reboots without notice. At the beginning I thought that this was an incompatibility with new generation AMD CPUs, especially since I noticed this message on dmesg:
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[ 0.000000] Detected CPU family 17h model 1
[ 0.000000] Warning: AMD Processor - this hardware has not undergone upstream testing. Please consult http://wiki.centos.org/FAQ for more information
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[ 0.119374] smpboot: CPU0: AMD Ryzen 5 1600 Six-Core Processor (fam: 17, model: 01, stepping: 01)
[ 0.221156] Performance Events: Fam17h core perfctr, AMD PMU driver.
[ 0.221160] ... version: 0
[ 0.221160] ... bit width: 48
[ 0.221161] ... generic registers: 6
[ 0.221162] ... value mask: 0000ffffffffffff
[ 0.221163] ... max period: 00007fffffffffff
[ 0.221163] ... fixed-purpose events: 0
[ 0.221164] ... event mask: 000000000000003f
[ 0.222198] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
[ 0.237470] mce: [Hardware Error]: Machine check events logged
[ 0.237526] mce: [Hardware Error]: CPU 2: Machine Check: 0 Bank 5: bea0000000000108
[ 0.222243] smpboot: Booting Node 0, Processors #1 #2
[ 0.237530] mce: [Hardware Error]: TSC 0
[ 0.237532] ADDR 1ffff89f16396 MISC d012000101000000 SYND 4d000000 IPID 500b000000000
[ 0.237534] mce: [Hardware Error]: PROCESSOR 2:800f11 TIME 1527449868 SOCKET 0 APIC 2 microcode 8001129
[ 0.237534] #3 #4 #5 #6 #7 #8 #9 #10 #11
[ 0.306145] Brought up 12 CPUs
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mcelog: ERROR: AMD Processor family 23: mcelog does not support this processor. Please use the edac_mce_amd module instead.
CPU is unsupported