Re: heartbeat panic by heavy traffic

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Sep 15, 2023 at 09:19:04AM -0000, Michael van Elst wrote:
> martin%duskware.de@localhost (Martin Husemann) writes:
> 
> >On Fri, Sep 15, 2023 at 12:17:58PM +0900, Masanobu SAITOH wrote:
> >> I think it would be good to change the default behavior from
> >> panic to something others because GENERIC kernel enables HEARTBEAT.
> >> by default. One of idea is to print warning message at sufficient intervals.
> 
> >I disagree. It is very important that we fix the underlying problem
> >instead. Without hearbeat, this behaviour is still visible (but undiagnosable).
> 
> The crash here comes from how the network stack operates. Running at
> a higher priority, it locks out the lower priority clock softint
> and heartbeat detects that and crashes the system intentionally.

But the clock softint shouldn't be locked out for 16s, ever.
It means that userland processes are stuck too, as well as kernel threads.

This is a real bug, the network stack should be fixed to relax at
periodic intervals.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--