Re: [RCU] zombie task hung in synchronize_rcu_expedited

From: Oleg Nesterov
Date: Fri Jun 07 2024 - 02:27:28 EST


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.