linux-kernel - Re: rcu_sched stalls on 4.14

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Message-ID: <CAOMZO5B54o=RSKH7-k=cUv5umusgU67XLV9SRNr3AJY-WqKnEA@mail.gmail.com>
Date:   Wed, 11 Mar 2020 13:35:09 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     paulmck@...nel.org, josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org, rcu@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: rcu_sched stalls on 4.14

Hi Hillf and Paul,

On Mon, Mar 9, 2020 at 9:03 AM Hillf Danton <hdanton@...a.com> wrote:

> Hi Fabio, two minutes to take a look at the softirq part in the syzbot report
> BUG: soft lockup in sys_exit_group.
>
> https://lore.kernel.org/lkml/s5h8sk9svdd.wl-tiwai@suse.de/T/#m0402638ecd30cf5a3c8bb44f03952ccad7a041d8

A different user reported the same bug and it turns out it was an USB
CDC ACM related issue:
https://www.spinics.net/lists/linux-usb/msg192162.html

Thanks for your help!

Fabio Estevam