System Hung After "TCP: too many of orphaned sockets" and "Out of socket memory" Errors

Solution Verified - Updated -

Issue

  • System was forced offline after being unresponsive to logins. Inspection of log entries prior to the forced reboot show an ever increasing number of the following messages.
    • kernel: TCP: too many of orphaned sockets
    • kernel: Out of socket memory
    • login: FATAL: bad tty

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Improperly customized net.ipv4.tcp_mem sysctl

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