Re: On softints, softnet_lock and sleeping (aka ipv6 vs USB network interfaces)

To: Taylor R Campbell <campbell+netbsd-tech-kern%mumble.net@localhost>
Subject: Re: On softints, softnet_lock and sleeping (aka ipv6 vs USB network interfaces)
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Date: Sun, 6 Dec 2015 22:34:04 +0100

On Sun, Dec 06, 2015 at 04:01:22PM +0000, Taylor R Campbell wrote:
> [...]
>    2) CPU 0 takes clock interrupt and nd6_timer expires.  nd6_timer starts and
>    tries to take softnet lock and blocks

a callout shout never sleep. When it does, this delays all other callouts.
I've already fixed deadlocks like this (the last one being related to
I2C).

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

Follow-Ups:
- re: On softints, softnet_lock and sleeping (aka ipv6 vs USB network interfaces)
  - From: matthew green

References:
- On softints, softnet_lock and sleeping (aka ipv6 vs USB network interfaces)
  - From: Nick Hudson
- Re: On softints, softnet_lock and sleeping (aka ipv6 vs USB network interfaces)
  - From: Taylor R Campbell

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