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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230816195853.7c2475d7@kernel.org>
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 :(