How to Obtain Kernel Freeze or Hang Information Using Hardware NMI (文档 ID 549779.1)
文档中涉及到的Linux系统下的watchdog及NMI;在正常情况下不建议启动此功能,原因如下(主要是因为该特性可能会导致节点驱逐,看如下(2)):
(1)What is the hung task watchdog?(https://access.redhat.com/articles/1353393)中明确说明watchdod不应该被endble:
     The hung task watchdog is primarily a debugging feature and should not really be enabled by default on an enterprise system.
(2)What tunables does NMI watchdog support to trigger a system reboot?(https://access.redhat.com/solutions/874733)
(3)References:Watchdog FAQ ( Doc ID 1005697.1 ) 
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