Re: [PATCH] x86,mm: print likely CPU at segfault time

[Thomas Gleixner]

Rik,

On Mon, Jul 19 2021 at 15:00, Rik van Riel wrote:
>
> Adding a printk to show_signal_msg() achieves that purpose. It isn't
> perfect since the task might get rescheduled on another CPU between
> when the fault hit and when the message is printed, but it should be
> good enough to show correlation between userspace and kernel errors
> when dealing with a bad CPU.

we could collect the cpu number in do_*_addr_fault() before interrupts
are enabled and just hand it through. There are only a few callchains
which end up in __bad_area_nosemaphore().

Thanks,

        tglx