Machine stopped responding without any indication in syslog

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My machine stopped responding, including to the console.
After a reboot, I looked at the syslog, and these are the messages just before the reboot:

May 7 12:00:01 seppuku systemd: Removed slice user-0.slice.
May 7 12:00:01 seppuku systemd: Stopping user-0.slice.
May 7 12:01:01 seppuku systemd: Created slice user-0.slice.
May 7 12:01:01 seppuku systemd: Starting user-0.slice.
May 7 12:01:01 seppuku systemd: Started Session 25183 of user root.
May 7 12:01:01 seppuku systemd: Starting Session 25183 of user root.
May 7 12:01:01 seppuku systemd: Started Session 25182 of user qa.
May 7 12:01:01 seppuku systemd: Starting Session 25182 of user qa.
May 7 12:01:02 seppuku systemd: Removed slice user-0.slice.
May 7 12:01:02 seppuku systemd: Stopping user-0.slice.
May 7 12:26:42 seppuku rsyslogd: [origin software="rsyslogd" swVersion="7.4.7" x-pid="1126" x-info="http://www.rsyslog.com"] start
May 7 12:26:08 seppuku kernel: microcode: microcode updated early to revision 0x20, date = 2016-03-16
May 7 12:26:08 seppuku kernel: Initializing cgroup subsys cpuset
May 7 12:26:08 seppuku kernel: Initializing cgroup subsys cpu
May 7 12:26:08 seppuku kernel: Initializing cgroup subsys cpuacct
May 7 12:26:08 seppuku kernel: Linux version 3.10.0-514.10.2.el7.x86_64 (mockbuild@x86-039.build.eng.bos.redhat.com) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Mon Feb 20 02:37:52 EST 2017
May 7 12:26:08 seppuku kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-514.10.2.el7.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet LANG=en_US.UTF-8
May 7 12:26:08 seppuku kernel: e820: BIOS-provided physical RAM map:
May 7 12:26:08 seppuku kernel: BIOS-e820: [mem 0x0000000000000000-0x0000000000057fff] usable
May 7 12:26:08 seppuku kernel: BIOS-e820: [mem 0x0000000000058000-0x0000000000058fff] reserved
May 7 12:26:08 seppuku kernel: BIOS-e820: [mem 0x0000000000059000-0x000000000009efff] usable
May 7 12:26:08 seppuku kernel: BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved

Since nothing indicates a root-cause for the problem, can you suggest where I could search for more data as to why my machine had to be rebooted?

RB

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