Hi, Cong Wang Thank you for taking the time to respond to me. Do you think the message(i.e. "RCU detect a stall on CPU 2") indicates there is a lockup. Cong Wang <xiyou.wangcong@xxxxxxxxx> 于2020年7月1日周三 下午2:07写道： > > On Tue, Jun 30, 2020 at 7:49 PM 孙世龙 sunshilong <sunshilong369@xxxxxxxxx> 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. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
