Re: [PATCH] irq_work: record irq_work_queue() call stack

[Peter Zijlstra]

On Wed, Mar 31, 2021 at 02:32:02PM +0800, qiang.zhang@xxxxxxxxxxxxx wrote:

> @@ -70,6 +70,9 @@ bool irq_work_queue(struct irq_work *work)
>  	if (!irq_work_claim(work))
>  		return false;
>  
> +	/*record irq_work call stack in order to print it in KASAN reports*/
> +	kasan_record_aux_stack(work);
> +
>  	/* Queue the entry and raise the IPI if needed. */
>  	preempt_disable();
>  	__irq_work_queue_local(work);

Thanks for the Cc :/ Also NAK.

I shall go revert this instantly. KASAN is not NMI safe, while
irq_work_queue() is very carefully crafted to be exactly that.