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[Linux] Linux 系统崩溃卡死,但没有任何 dump 输出,该如何排查?

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设备:rk3568 平台,Linux 4.19 ,Ubuntu 20.04

崩溃概率:偶现。

崩溃的时候系统彻底卡死,调试串口也没有任何输出,连 panic 都不打印。

我尝试 echo c > /proc/sysrq-trigger ,发现调试串口是有调用栈打印的。我也启用了 nmi_watchdog,在手动 echo c > /proc/sysrq-trigger 的时候看门狗能正常启动,但卡死的时候看门狗也失效了。

这个内核是我自己改过的,我该如何排查:

  1. 这个问题是硬件问题还是软件问题导致的?
  2. 如果是软件问题,我该如何 debug ?

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