netdev - Re: [syzbot] [net?] INFO: rcu detected stall in unix

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Date: Wed, 16 Aug 2023 19:58:53 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang
 <xiyou.wangcong@...il.com>, Pedro Tammela <pctammela@...atatu.com>, Victor
 Nogueira <victor@...atatu.com>, syzbot
 <syzbot+a3618a167af2021433cd@...kaller.appspotmail.com>,
 bpf@...r.kernel.org, brauner@...nel.org, davem@...emloft.net,
 edumazet@...gle.com, jiri@...dia.com, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
 Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: Re: [syzbot] [net?] INFO: rcu detected stall in unix_release

On Thu, 17 Aug 2023 01:57:59 +0300 Vladimir Oltean wrote:
> There are multiple workarounds that can be done in taprio (and mqprio)
> depending on what is considered as being sane API. Though I don't want
> to get ahead of myself. Maybe there is a way to fast-forward the
> qdisc_destroy() of the previous taprio so it doesn't overlap with the
> new one's qdisc_create().

Thanks for the details. I'm going to let others comment, but sounds 
a bit similar to the recent problem with the ingress qdisc. The qdisc
expects to own the netdev which explodes when its lifetime rules are
fully exercised :(