Re: [RCU] zombie task hung in synchronize_rcu_expedited

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Subject: Re: [RCU] zombie task hung in synchronize_rcu_expedited
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Fri, 7 Jun 2024 08:25:31 +0200
Cc: Sudhanva.Huruli@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, apais@xxxxxxxxxxxxxxxxxxx, axboe@xxxxxxxxx, boqun.feng@xxxxxxxxx, brauner@xxxxxxxxxx, ebiederm@xxxxxxxxxxxx, frederic@xxxxxxxxxx, j.granados@xxxxxxxxxxx, jiangshanlai@xxxxxxxxx, joel@xxxxxxxxxxxxxxxxx, josh@xxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, mathieu.desnoyers@xxxxxxxxxxxx, michael.christie@xxxxxxxxxx, mjguzik@xxxxxxxxx, neeraj.upadhyay@xxxxxxxxxx, paulmck@xxxxxxxxxx, qiang.zhang1211@xxxxxxxxx, rachelmenge@xxxxxxxxxxxxxxxxxxx, rcu@xxxxxxxxxxxxxxx, rostedt@xxxxxxxxxxx, weifu@xxxxxxxxxxxxx
In-reply-to: <20240607030219.2990306-1-fuweid89@gmail.com>
User-agent: Mutt/1.5.24 (2015-08-30)

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.

Follow-Ups:
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References:
- Re: [RCU] zombie task hung in synchronize_rcu_expedited
  - From: Oleg Nesterov
- Re: [RCU] zombie task hung in synchronize_rcu_expedited
  - From: Wei Fu

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