Re: [RCU] zombie task hung in synchronize_rcu_expedited

[Oleg Nesterov]

Thanks for this info,

On 06/07, Wei Fu wrote:
>
> All the kernels disable CONFIG_PREEMPT and PREEMPT_RCU.

Ah, this can explain both soft-lockup and synchronize_rcu() hang. If my theory
is correct.

Can you try the patch I sent?

Oleg.