linux-kernel - Re: [tip:sched/core] [sched] b079d93796: WARNING:possible_recursive_locking_detected_migration_is_trying_to_acquire_lock:at:set_cpus_allowed_force_but_task_is_already_holding_lock:at:cpu_stopper

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Message-ID: <aQCpLifOIy1Ct4tL@li-276bd24c-2dcc-11b2-a85c-945b6f05615c.ibm.com>
Date: Tue, 28 Oct 2025 12:29:50 +0100
From: Jan Polensky <japo@...ux.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
        x86@...nel.org, Juri Lelli <juri.lelli@...hat.com>,
        Tejun Heo <tj@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>, cgroups@...r.kernel.org,
        aubrey.li@...ux.intel.com, yu.c.chen@...el.com
Subject: Re: [tip:sched/core] [sched]  b079d93796:
 WARNING:possible_recursive_locking_detected_migration_is_trying_to_acquire_lock:at:set_cpus_allowed_force_but_task_is_already_holding_lock:at:cpu_stopper_thread

On Tue, Oct 28, 2025 at 10:03:24AM +0100, Peter Zijlstra wrote:
> On Mon, Oct 27, 2025 at 12:01:33PM +0100, Peter Zijlstra wrote:
>
> Could someone confirm this fixes the problem?
>
Tested-by: Jan Polensky <japo@...ux.ibm.com>

Thank you for the quick fix. I’ve verified the patch on s390x and can confirm that it resolves the
spin lock issue.