linux-kernel - Re: [RCU] zombie task hung in synchronize_rcu

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Date: Fri, 7 Jun 2024 08:25:31 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Wei Fu <fuweid89@...il.com>
Cc: Sudhanva.Huruli@...rosoft.com, akpm@...ux-foundation.org,
	apais@...ux.microsoft.com, axboe@...nel.dk, boqun.feng@...il.com,
	brauner@...nel.org, ebiederm@...ssion.com, frederic@...nel.org,
	j.granados@...sung.com, jiangshanlai@...il.com,
	joel@...lfernandes.org, josh@...htriplett.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
	michael.christie@...cle.com, mjguzik@...il.com,
	neeraj.upadhyay@...nel.org, paulmck@...nel.org,
	qiang.zhang1211@...il.com, rachelmenge@...ux.microsoft.com,
	rcu@...r.kernel.org, rostedt@...dmis.org, weifu@...rosoft.com
Subject: Re: [RCU] zombie task hung in synchronize_rcu_expedited

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.