虚拟机报告一个 "BUG: soft lockup" (或同时报告多个)

Issue

• 虚拟机客户机同时出现多个软锁定
• 由于软锁定，出现内核 panic 的情况。

• 日志显示类似的消息（来自不同来源的示例）：

  BUG: soft lockup - CPU#6 stuck for 73s! [flush-253:0:1207]
  BUG: soft lockup - CPU#7 stuck for 74s! [processname:15706]
  BUG: soft lockup - CPU#5 stuck for 63s! [processname:25582]
  BUG: soft lockup - CPU#0 stuck for 64s! [proceessname:15789]
  
  --or--
  
  <time> <hostname> kernel: NMI watchdog: BUG: soft lockup - CPU#6 stuck for 25s! [ksoftirqd/6:38]
  <time> <hostname> kernel: NMI watchdog: BUG: soft lockup - CPU#7 stuck for 22s! [ksoftirqd/7:43]
  <time> <hostname> kernel: NMI watchdog: BUG: soft lockup - CPU#7 stuck for 24s! [NetworkManager:945]
  <time> <hostname> kernel: NMI watchdog: BUG: soft lockup - CPU#7 stuck for 22s! [watchdog/7:41]  
  

  也可能会记录以下行：

  hrtimer: interrupt took NUMBER ns