multicore and crash

[Joongyu Sun]

Hi, Naveen

2011/2/15 naveen yadav <yad.naveen at gmail.com>

> Hi All,
>
> I need small clarification for multicore linux kernel
>
> Case;1
> Kernel space:
>
> 1. If on two CPU's both running in kernel space and both crash at same
> time t. what will happen will we get two crash dumps of registers or
> single ?
>


> - when kernel dies in SMP environment, it needs to aquire
> spin_lock(die_lock) to enter die().
>      So the first one which get the lock earlier will handle die() first.
> If the kernel is still alive then
>      the later one will enter die().
>      If kernel is in panic, it shutdown the other cpus and halt the system.
> So no one can do further jobs.
>
>

> Case :2
>
> User Space:
>
> 1. If on two CPU's both running in User space and both crash at same
> time t. what will happen will we get two core files, Single core with
> dump for both ?
>
> Thanks
>
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