Why does Red Hat Enterprise Linux Server reboot with "signal 15" messages in /var/log/messages?

Solution Verified - Updated -

Issue

  • Server rebooted with "signal 15."
  • Server automatically rebooted.
  • Server unexpectedly rebooted.
  • What does exiting on signal 15 mean in /var/log/messages?

    shutdown: shutting down for system reboot
    init: Switching to runlevel: 6
    [...]
    exiting on signal 15
    syslogd 1.4.1: restart.
    syslog: syslogd startup succeeded
    
  • Server rebooted unexpectedly with the shutdown message in /var/log/messages.

    <hostname> shutdown[7180]: shutting down for system reboot <--- This log shows manual REBOOT triggered by someone
    <hostname> snmpd[4058]: cmaX: subMIB 18 handler has disconnected 
    <hostname> sshd[7113]: Transferred: sent 5192, received 3424 bytes
    <hostname> snmpd[4058]: cmaX: subMIB 1 handler has disconnected 
    <hostname> .
    <hostname> .
    <hostname> .
    <hostname> snmpd[4058]: cmaX: subMIB 21 handler has disconnected 
    <hostname> snmpd[4058]: cmaX: subMIB 22 handler has disconnected 
    <hostname> snmpd[4058]: cmaX: subMIB 23 handler has disconnected 
    <hostname> hpasmxld[4551]: Process has been instructed to stop from the user interface. Stopping hpasmxld process. . . 
    <hostname> xinetd[4114]: Exiting...
    <hostname> vasd[25173]: vasd IPC handler (PID 25173) exiting
    <hostname> vasd[11150]: vasd parent process (PID 11150) exiting
    <hostname> kernel: ACPI: PCI interrupt for device 0000:01:04.6 disabled
    <hostname> ntpd[4129]: ntpd exiting on signal 15
    <hostname> vasproxyd[11280]: 11280: Got SIGTERM/SIGINT. Shutting down...
    <hostname> rpc.statd[3730]: Caught signal 15, un-registering and exiting.
    <hostname> portmap[9171]: connect from 127.0.0.1 to unset(status): request from unprivileged port
    <hostname> kernel: Kernel logging (proc) stopped.
    <hostname> kernel: Kernel log daemon terminating.
    <hostname> exiting on signal 15
    <hostname> syslogd 1.4.1: restart.
    

Environment

  • Red Hat Enterprise Linux (RHEL) 4, 5, 6, 7, 8

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