Chapter 1. Kernel

New panic_on_io_nmi Kernel Option

The Red Hat Enterprise Linux 5.10 kernel includes a new panic_on_io_nmi option (configured via the /proc/sys/kernel/panic_on_io_nmi file). This option allows users to press the hardware or virtual Non Maskable Interrupt (NMI) button, which acts as an I/O error and triggers a crash where otherwise no crash would occur. This can be used in cases when the system is unresponsive and does not accept any commands.

Added kABI Symbols

The following kABI symbols have been added to the kernel shipped with Red Hat Enterprise Linux 5.10:
  • unregister_lro_netdev
  • register_lro_netdev
  • libfc
  • libfcoe
These symbols allow Large Receive Offload to be disabled by the kernel stack.