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SubjectRe: rcu_sched stalls on 4.14
Hi Hillf and Paul,

On Mon, Mar 9, 2020 at 9:03 AM Hillf Danton <hdanton@sina.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

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