Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2

Thomas Gleixner
2010-03-24T20:42:29Z

B1;2005;0cOn Wed, 24 Mar 2010, Andi Kleen wrote:

> Prevent nested interrupts when the IRQ stack is near overflowing v2
>
> Interrupts can always nest when they don't run with IRQF_DISABLED.
>
> When a lot of interrupts hit the same vector on the same
> CPU nested interrupts can overflow the irq stack and cause hangs.
>
> This has been observed with MSI-X & Ethernet on a large system.

In which way are which interrupts nested ?

Thanks,

tglx