On Tue, Jun 30, 2020 at 7:49 PM 孙世龙 sunshilong <sunshilong...@gmail.com> wrote: > > Hi, list > > My x86 machine(linux4.19) sometimes hangs, suddenly not responding in > any way to the mouse or the keyboard. > > How can I investigate why it hung up? Is there extra information I can > find for a clue? Is there anything less drastic than power-off to get > some kind of action, if only some limited shell or just beeps, > but might give a clue? >
If the hang was a crash which you didn't get a chance to capture the last kernel log, you can use kdump to collect them. The kernel log tells what kind of crash it is, a NULL pointer deref, a kernel page fault etc.. If the hang was a hard lockup, you have to turn on lockup detector and also kdump to capture what the detector tells. Thanks.
